High-speed electric driving system for electric loader and control method

Abstract

The high-speed electric drive system for the electric loader comprises an all-in-one controller, the all-in-one controller is electrically connected with a high-speed drive motor, a high-speed pump motor, a temperature control system and a battery system, the high-speed drive motor is electrically connected with a high-speed two-gear gearbox, and the high-speed two-gear gearbox is electrically connected with a high-speed pump motor. The high-speed two-gear gearbox is provided with a first-gear working gear and a second-gear working gear, the high-speed pump motor is electrically connected with a single-gear gearbox, the all-in-one controller and the battery system are in communication connection with the whole vehicle VCU, and the whole vehicle VCU detects the states of the all-in-one controller and the battery system and sends a signal instruction to the system. The power-on of the system, the starting of the driving system for driving and the starting of the hydraulic system for driving the equipment to work are respectively completed. Two different gears are arranged on the high-speed two-gear gearbox to be matched with different working scenes, so that the electric loader can more reasonably use power output by the high-speed driving motor.

Description

Technical Field

[0001] The invention belongs to the technical field of electric loaders, and in particular to a high-speed electric drive system and a control method for an electric loader. Background Art

[0002] New energy technologies are becoming more and more popular in the field of electric loaders. Compared with passenger cars, the operating environment and working conditions of electric loaders are worse. In addition, the layout space of electric loaders is limited and the system cost is too high. After the electric loaders on the market are arranged, the related cooling water circuits and high and low voltage wiring harnesses are very difficult to arrange, and the maintenance convenience is extremely poor. The above problems seriously restrict the progress of new energy in my country's electric loaders.

[0003] In the prior art, a low-speed, high-torque drive motor is combined with a gearbox and then arranged on the electric loader frame through a bracket. The motor is connected to the corresponding controller through high and low voltage lines, communicates with the vehicle VCU, and provides power for the vehicle to travel and shovel. After the pump motor is connected to the working pump, the motor is connected to the corresponding controller through high and low voltage lines, communicates with the vehicle VCU, and provides power for the vehicle's working device. The PDU is arranged separately on the frame, and the battery high-voltage box supplies power to the PDU. The PDU is distributed to TMCU, PMCU, DCDC, PTC (electric heating), AC (air conditioning) and components, and is directly connected to power and communicate through high and low voltage lines.

[0004] After searching, the Chinese utility model patent: A powertrain device for a pure electric loader (publication number: CN217710940U, publication date: 2022.11.01), the application includes a power battery, a high-voltage box, a BMS controller, an all-in-one controller, a walking electronic control, a walking motor, a pump motor, a hydraulic tandem pump and a gearbox. A dual-motor drive mode is adopted, one motor provides walking power and one motor provides working power. However, the motor that provides working power is directly connected to the hydraulic tandem pump, and the output power cannot be used more accurately. Summary of the invention

[0005] 1. Technical problem to be solved by the invention

[0006] The purpose of the present invention is to solve the problem that the motor for providing working power for the existing electric loader cannot use the output power more accurately.

[0007] 2. Technical solution

[0008] In order to achieve the above object, the technical solution provided by the present invention is:

[0009] A high-speed electric drive system for an electric loader of the present invention comprises an all-in-one controller, wherein the all-in-one controller is electrically connected to a high-speed drive motor, a high-speed pump motor, a temperature control system and a battery system respectively, the high-speed drive motor is electrically connected to a high-speed two-speed gearbox, the high-speed two-speed gearbox is provided with 1st and 2nd working gears, the high-speed pump motor is electrically connected to a single-speed gearbox, and the all-in-one controller and the battery system are respectively communicatively connected to the VCU of the whole vehicle.

[0010] Preferably, the all-in-one controller integrates a PMCU, a TMCU, an auxiliary drive power distribution unit and a DCDC system.

[0011] Preferably, the DCDC system includes a DCDC relay and a DCDC, and the DCDC is connected to the DCDC relay via a circuit.

[0012] Preferably, the temperature control system includes AC and PTC, and the AC and PTC are integrally arranged on the vehicle frame.

[0013] Preferably, the auxiliary drive power distribution unit includes a main positive relay 1, a main positive pre-charging relay 1 and a main positive pre-charging relay 1, the main positive pre-charging relay 1 is electrically connected to the pre-charging resistor 1, the branch connecting the main positive pre-charging relay 1 and the pre-charging resistor 1 is electrically connected in parallel with the main positive relay 1 to form branch 1, the branch 1 is connected to the PMCU, the high-speed drive motor and the high-speed two-speed gearbox in sequence through a circuit, and the PMCU is connected to the battery system through a circuit.

[0014] Preferably, the auxiliary drive power distribution unit also includes a main positive relay 2, a main positive pre-charging relay 2, a pre-charging resistor 2, a PTC relay and an AC relay. The PTC is electrically connected to the PTC relay to form a branch 2, the AC is electrically connected to the AC relay to form a branch 3, the circuit where the TMCU is located is a branch 4, and the branch 4 is connected to the single-speed gearbox and the high-speed pump motor. The DCDC is electrically connected to the DCDC relay to form a branch 5, the main positive pre-charging relay 2 is electrically connected to the pre-charging resistor 2, and the branch formed by the electrical connection of the main positive pre-charging relay 2 and the pre-charging resistor 2 is connected in parallel with the main positive relay 2 to form a branch 6. After the branch 2, the branch 3, the branch 4 and the branch 5 are connected in parallel, they are connected to the branch 6 and the battery system in sequence, and the branch 6 is connected in parallel with the branch 1.

[0015] Preferably, the high-speed drive motor and the high-speed two-speed gearbox are integrally arranged on the vehicle frame, and the high-speed pump motor and the single-speed gearbox are integrally arranged on the vehicle frame.

[0016] Preferably, the motor speed used by the high-speed drive motor and the high-speed pump motor is above 1000 rpm.

[0017] Preferably, the battery system includes a battery pack and a main negative relay, and the battery pack is connected to the main negative relay via a circuit.

[0018] Preferably, the method specifically comprises the following steps:

[0019] S11, the vehicle VCU detects the status of the battery system and the all-in-one controller;

[0020] S12, when the detected equipment is in good condition and the relays are not in a sticky state, continue to step S13; if there is a problem in the detection, continue to step S11;

[0021] S13, the vehicle VCU sends a signal to the battery system and the all-in-one controller to close the main negative relay, the main positive pre-charge relay 1 and the main positive pre-charge relay 2;

[0022] S14, the battery pack pre-charges the PMCU and the TMCU;

[0023] S15, the vehicle VCU detects the voltage values ​​of the PMCU and the TMCU, and compares the voltage values ​​of the PMCU and the TMCU. If the difference between the two values ​​is greater than 10V, step S14 is executed; if the difference between the two values ​​is less than 10V, step S16 is executed;

[0024] S16. The vehicle VCU sends a signal to the battery system and the all-in-one controller, the main positive relay 1 and the main positive relay 2 are closed, the main positive pre-charge relay 1 and the main positive pre-charge relay 2 are disconnected, the PTC relay, the AC relay and the DCDC relay are closed, and the battery pack replenishes power to the PMCU, the TMCU, the DCDC, the AC and the PTC.

[0025] Preferably, the method specifically comprises the following steps:

[0026] S21, the vehicle VCU interacts with the TMCU and the PMCU;

[0027] S22, when the vehicle VCU detects the working scene, it sends different control signals. When it is a low-speed and high-torque scene, it executes step S23, and when it is a high-speed and low-torque scene, it executes step S24;

[0028] S23, the vehicle VCU sends a signal to the TMCU, and the high-speed two-speed gearbox is set to the first gear, so that the high-speed drive motor drives the high-speed two-speed gearbox to drive in the first gear;

[0029] S24, the vehicle VCU sends a signal to the TMCU, and the high-speed two-speed gearbox is set to the second gear, so that the high-speed drive motor drives the high-speed two-speed gearbox to drive in the second gear.

[0030] Preferably, the method specifically comprises the following steps:

[0031] S31, the vehicle VCU calculates a speed that meets the requirements according to the hydraulic system pressure and the displacement of the high-speed pump motor;

[0032] S32, the vehicle VCU sends a signal to the PMCU;

[0033] S33, the high-speed pump motor drives the single-speed gearbox to drive the hydraulic system, thereby driving the equipment to work.

[0034] 3. Beneficial effects

[0035] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0036] A high-speed electric drive system and control method for an electric loader of the present invention comprises an all-in-one controller, wherein the all-in-one controller is electrically connected to a high-speed drive motor, a high-speed pump motor, a temperature control system and a battery system respectively, wherein the high-speed drive motor is electrically connected to a high-speed two-speed gearbox, wherein the high-speed two-speed gearbox is provided with 1st and 2nd working gears, wherein the high-speed pump motor is electrically connected to a single-speed gearbox, wherein the all-in-one controller and the battery system are respectively connected to the vehicle VCU for communication, wherein the vehicle VCU detects the status of the all-in-one controller and the battery system, sends a signal instruction to the system, and respectively completes the power-on of the system, starts the drive system to drive, and starts the hydraulic system to drive the equipment to work. The present application sets two different gears of the high-speed two-speed gearbox to match different working scenes, so that the electric loader can use the power output by the high-speed drive motor more reasonably. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of a high-speed electric drive system for an electric loader of the present invention;

[0038] Figure 2 A topological diagram of a high-speed electric drive system for an electric loader of the present invention;

[0039] Figure 3 The present invention is a flow chart of a control method for replenishing power for a high-speed electric drive system for an electric loader according to the present embodiment.

[0040] Explanation of the symbols in the schematic diagram:

[0041] 100, all-in-one controller; 110, PMCU; 120, TMCU; 130, auxiliary drive power distribution unit; 131, main positive relay 1; 132, main positive pre-charge relay 1; 133, pre-charge resistor 1; 134, main positive relay 2; 135, main positive pre-charge relay 2; 136, pre-charge resistor 2; 137, PTC relay; 138, AC relay; 140, DCDC system; 141, DCDC relay; 142, DCDC;

[0042] 200, high-speed drive motor; 300, high-speed two-speed gearbox; 400, high-speed pump motor; 500, single-speed gearbox; 600, temperature control system; 610, AC; 620, PTC; 700, battery system; 710, battery pack; 720, main negative relay. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0044] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] In this application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "center", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0046] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0047] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0049] Example 1

[0050] Refer to the attached Figure 1-2 A high-speed electric drive system for an electric loader of this embodiment includes an all-in-one controller 100, and the all-in-one controller 100 is electrically connected to a high-speed drive motor 200, a high-speed pump motor 400, a temperature control system 600 and a battery system 700, respectively. The temperature control system 600 is used to adjust the interior ambient temperature of the electric loader and to adjust the temperature environment of the battery system 700, and the battery system 700 is used to provide power to the equipment of the electric loader.

[0051] The high-speed drive motor 200 is electrically connected to a high-speed two-speed gearbox 300, and the high-speed two-speed gearbox 300 is provided with 1st gear and 2nd gear working gears. When the whole vehicle VCU detects a low-speed and high-torque scenario, the whole vehicle VCU sends a signal to the PMCU110, and the high-speed two-speed gearbox 300 is set to the first gear, so that the high-speed drive motor 200 drives the high-speed two-speed gearbox 300 to drive in the first gear. When the whole vehicle VCU detects a high-speed and low-torque scenario, the whole vehicle VCU sends a signal to the PMCU110, and the high-speed two-speed gearbox 300 is set to the second gear, so that the high-speed drive motor 200 drives the high-speed two-speed gearbox 300 to drive in the second gear; the high-speed pump motor 400 is electrically connected to a single-speed gearbox 500, and the high-speed pump motor 400 drives the single-speed gearbox 500 at high speed to drive the hydraulic system to provide working power for the working pump of the electric loader.

[0052] The all-in-one controller 100 and the battery system 700 are respectively connected to the vehicle VCU for communication. The vehicle VCU detects the status of the all-in-one controller 100 and the battery system 700, and sends signal instructions to the system to power on the system, start the drive system for driving, and start the hydraulic system drive equipment.

[0053] The temperature control system 600 includes AC610 and PTC620. AC610 and PTC620 are integrally arranged on the vehicle frame to save the layout space of the vehicle frame. The AC610 is used to adjust the interior ambient temperature of the electric loader so that the staff inside the vehicle can work better. The PTC620 is used to adjust the temperature environment of the battery system 700 so that the battery system 700 can output stably.

[0054] The all-in-one controller 100 integrates PMCU110, TMCU120, auxiliary drive power distribution unit 130 and DCDC system 140. The PMCU110, TMCU120, auxiliary drive power distribution unit 130 and DCDC system 140 are concentrated in one body, reducing the wiring harness connection between the controller and the vehicle energy distribution unit, and reducing the layout space.

[0055] The DCDC system 140 includes a DCDC relay 141 and a DCDC 142, and the DCDC 142 is connected to the DCDC relay 141 through a circuit; the auxiliary drive power distribution unit 130 includes a main positive relay 131, a main positive pre-charge relay 132 and a pre-charge resistor 133, and the main positive pre-charge relay 132 and the pre-charge resistor 133 are electrically connected. The branch connected by the main positive pre-charge relay 132 and the pre-charge resistor 133 is electrically connected in parallel with the main positive relay 131 to form a branch 1, and the branch 1 is connected to the PMCU 110, the high-speed drive motor 200 and the high-speed two-speed gearbox 300 in sequence through a circuit. The PMCU 110 is connected to the battery system 700 through a circuit, and the battery system 700 can supply power to the PMCU 110.

[0056] The auxiliary drive power distribution unit 130 also includes a main positive relay 134, a main positive pre-charge relay 135, a pre-charge resistor 136, a PTC relay 137 and an AC relay 138. The PTC 620 is electrically connected to the PTC relay 137 to form a branch 2. The AC 610 is electrically connected to the AC relay 138 to form a branch 3. The circuit where the TMCU 120 is located is a branch 4. The branch 4 is connected to the single-speed gearbox 500 and the high-speed pump motor 400. The DCDC 142 is electrically connected to the DCDC relay 141 to form a branch. 5. The main positive pre-charge relay 2 135 is electrically connected to the pre-charge resistor 2 136. The branch formed by the electrical connection between the main positive pre-charge relay 2 135 and the pre-charge resistor 2 136 is connected in parallel with the main positive relay 2 134 to form branch 6. The branch 2, the branch 3, the branch 4 and the branch 5 are connected in parallel and then connected to the branch 6 and the battery system 700 in turn. The branch 1 is connected in parallel to the branch 6. The battery system 700 can replenish the PTC620, the AC610, the TMCU120 and the DCDC142.

[0057] The motor speed used by the high-speed drive motor 200 and the high-speed pump motor 400 is above 1000 rpm. The high-speed drive motor 200 and the high-speed two-speed gearbox 300 are integrally arranged on the vehicle frame. The high-speed pump motor 400 and the single-speed gearbox 500 are integrally arranged on the vehicle frame.

[0058] Example 2

[0059] Refer to the attached Figure 3 The present embodiment provides a control method for a high-speed electric drive system for an electric loader. The method is performed using the drive system described in Example 1. Specifically,

[0060] S11, the vehicle VCU detects the status of the battery system 700 and the all-in-one controller 100;

[0061] S12, when the detected equipment is in good condition and the relays are not in a sticky state, continue to step S13; if there is a problem in the detection, continue to step S11;

[0062] S13, the vehicle VCU sends a signal to the battery system 700 and the all-in-one controller 100 to close the main negative relay 720, the main positive pre-charge relay 1 132 and the main positive pre-charge relay 2 135;

[0063] S14, the battery pack 710 pre-charges the PMCU 110 and the TMCU 120;

[0064] S15, the vehicle VCU detects the voltage values ​​of the PMCU110 and the TMCU120, and compares the voltage values ​​of the PMCU110 and the TMCU120. If the difference between the two values ​​is greater than 10V, step S14 is executed; if the difference between the two values ​​is less than 10V, step S16 is executed;

[0065] S16. The vehicle VCU sends a signal to the battery system 700 and the all-in-one controller 100, the main positive relay 131 and the main positive relay 2 134 are closed, the main positive pre-charge relay 132 and the main positive pre-charge relay 2 135 are disconnected, the PTC relay 137, the AC relay 138 and the DCDC relay 141 are closed, and the battery pack 710 replenishes power for the PMCU 110, the TMCU 120, the DCDC 142, the AC 610 and the PTC 620.

[0066] Example 3

[0067] This embodiment provides a control method for a high-speed electric drive system for an electric loader. The method is performed using the drive system described in Embodiment 1. Specifically,

[0068] S21, the vehicle VCU interacts with the TMCU120 and the PMCU110;

[0069] S22, when the vehicle VCU detects the working scene, it sends different control signals. When it is a low-speed and high-torque scene, it executes step S23, and when it is a high-speed and low-torque scene, it executes step S24;

[0070] S23, the vehicle VCU sends a signal to the TMCU 120, and the high-speed two-speed gearbox 300 is set to the first gear, so that the high-speed drive motor 200 drives the high-speed two-speed gearbox 300 to drive in the first gear;

[0071] S24, the vehicle VCU sends a signal to the TMCU 120, and the high-speed two-speed gearbox 300 is set to the second gear, so that the high-speed drive motor 200 drives the high-speed two-speed gearbox 300 to drive in the second gear.

[0072] Example 4

[0073] This embodiment provides a control method for a high-speed electric drive system for an electric loader. The method is performed using the drive system described in Embodiment 1. Specifically,

[0074] S31, the vehicle VCU calculates a speed that meets the requirements according to the hydraulic system pressure and the displacement of the high-speed pump motor 400;

[0075] S32, the vehicle VCU sends a signal to the PMCU110;

[0076] S33, the high-speed pump motor 400 drives the single-speed gearbox 500 to drive the hydraulic system and drive the equipment to work.

[0077] The above-described embodiments only express a certain implementation mode of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A high-speed electric drive system for an electric loader, characterized in that: The invention comprises an all-in-one controller (100), wherein the all-in-one controller (100) is electrically connected to a high-speed drive motor (200), a high-speed pump motor (400), a temperature control system (600) and a battery system (700), respectively; the high-speed drive motor (200) is electrically connected to a high-speed two-speed gearbox (300), wherein the high-speed two-speed gearbox (300) is provided with first and second working gears; the high-speed pump motor (400) is electrically connected to a single-speed gearbox (500), and the all-in-one controller (100) and the battery system (700) are respectively connected to the vehicle VCU for communication.

2. A high-speed electric drive system for an electric loader according to claim 1, characterized in that: The all-in-one controller (100) integrates a PMCU (110), a TMCU (120), an auxiliary drive power distribution unit (130) and a DCDC system (140).

3. A high-speed electric drive system for an electric loader according to claim 2, characterized in that: The DCDC system (140) includes a DCDC relay (141) and a DCDC (142), and the DCDC (142) is connected to the DCDC relay (141) via a circuit.

4. A high-speed electric drive system for an electric loader according to claim 3, characterized in that: The temperature control system (600) comprises an AC (610) and a PTC (620), wherein the AC (610) and the PTC (620) are integrally arranged on a vehicle frame.

5. A high-speed electric drive system for an electric loader according to claim 4, characterized in that: The auxiliary drive power distribution unit (130) comprises a main positive relay (131), a main positive pre-charging relay (132) and a pre-charging resistor (133); the main positive pre-charging relay (132) and the pre-charging resistor (133) are electrically connected; a branch connected by the main positive pre-charging relay (132) and the pre-charging resistor (133) is electrically connected in parallel with the main positive relay (131) to form a branch 1; the branch 1 is connected to the PMCU (110), the high-speed drive motor (200) and the high-speed two-speed gearbox (300) in sequence through a circuit; and the PMCU (110) is connected to the battery system (700) through a circuit.

6. A high-speed electric drive system for an electric loader according to claim 5, characterized in that: The auxiliary drive power distribution unit (130) further comprises a main positive relay (134), a main positive pre-charge relay (135), a pre-charge resistor (136), a PTC relay (137) and an AC relay (138); the PTC (620) and the PTC relay (137) are electrically connected to form a branch 2; the AC (610) and the AC relay (138) are electrically connected to form a branch 3; the circuit in which the TMCU (120) is located is a branch 4; the branch 4 is connected to the single-speed gearbox (500) and the high-speed pump motor (400). The DCDC (142) is electrically connected to the DCDC relay (141) to form a branch 5, the main positive pre-charge relay 2 (135) and the pre-charge resistor 2 (136) are electrically connected, and the branch formed by the main positive pre-charge relay 2 (135) and the pre-charge resistor 2 (136) are connected in parallel with the main positive relay 2 (134) to form a branch 6, and the branch 2, the branch 3, the branch 4 and the branch 5 are connected in parallel and then connected to the branch 6 and the battery system (700) in sequence, and the branch 6 is connected in parallel with the branch 1.

7. A high-speed electric drive system for an electric loader according to claim 6, characterized in that: The high-speed drive motor (200) and the high-speed two-speed gearbox (300) are integrally arranged on the vehicle frame, and the high-speed pump motor (400) and the single-speed gearbox (500) are integrally arranged on the vehicle frame.

8. A high-speed electric drive system for an electric loader according to claim 7, characterized in that: The motor rotation speed used by the high-speed drive motor (200) and the high-speed pump motor (400) is above 1000 rpm.

9. A high-speed electric drive system for an electric loader according to claim 8, characterized in that: The battery system (700) includes a battery pack (710) and a main negative relay (720), and the battery pack (710) is connected to the main negative relay (720) via a circuit.

10. The control method of the high-speed electric drive system for an electric loader according to any one of claims 1 to 9, characterized in that: The method specifically comprises the following steps: S11, the vehicle VCU detects the status of the battery system (700) and the all-in-one controller (100); S12, when the detected equipment is in good condition and the relays are not in a sticky state, continue to step S13; if there is a problem in the detection, continue to step S11; S13, the vehicle VCU sends a signal to the battery system (700) and the all-in-one controller (100), closing the main negative relay (720), the main positive pre-charge relay 1 (132) and the main positive pre-charge relay 2 (135); S14, the battery pack (710) pre-charges the PMCU (110) and the TMCU (120); S15, the vehicle VCU detects the voltage values ​​of the PMCU (110) and the TMCU (120), and compares the voltage values ​​of the PMCU (110) and the TMCU (120); if the difference between the voltage values ​​of the PMCU (110) and the TMCU (120) is greater than 10V, step S14 is executed; if the difference between the voltage values ​​of the PMCU (110) and the TMCU (120) is less than 10V, step S16 is executed; S16. The vehicle VCU sends a signal to the battery system (700) and the all-in-one controller (100), the main positive relay 1 (131) and the main positive relay 2 (134) are closed, the main positive pre-charge relay 1 (132) and the main positive pre-charge relay 2 (135) are disconnected, the PTC relay (137), the AC relay (138) and the DCDC relay (141) are closed, and the battery pack (710) replenishes power to the PMCU (110), the TMCU (120), the DCDC (142), the AC (610) and the PTC (620).

11. The control method of a high-speed electric drive system for an electric loader according to any one of claims 1 to 9, characterized in that: The method specifically comprises the following steps: S21, the vehicle VCU interacts with the TMCU (120) and the PMCU (110); S22, when the vehicle VCU detects the working scene, it sends different control signals. When it is a low-speed and high-torque scene, it executes step S23, and when it is a high-speed and low-torque scene, it executes step S24; S23, the vehicle VCU sends a signal to the TMCU (120), and the high-speed two-speed gearbox (300) is set to the first gear, so that the high-speed drive motor (200) drives the high-speed two-speed gearbox (300) to drive in the first gear; S24: The vehicle VCU sends a signal to the TMCU (120), and the high-speed two-speed gearbox (300) is set to the second gear, so that the high-speed drive motor (200) drives the high-speed two-speed gearbox (300) to drive in the second gear.

12. The control method of the high-speed electric drive system for an electric loader according to any one of claims 1 to 9, characterized in that: The method specifically comprises the following steps: S31, the vehicle VCU calculates a speed that meets the requirements according to the hydraulic system pressure and the displacement of the high-speed pump motor (400); S32, the vehicle VCU sends a signal to the PMCU (110); S33, the high-speed pump motor (400) drives the single-speed gearbox (500) to drive the hydraulic system, thereby driving the equipment to work.

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