Low-voltage electrical structure suitable for extended-range wide-body vehicle

Abstract

The utility model discloses a low-voltage electrical structure suitable for an extended-range wide-body vehicle, which comprises a frame module, a cab module, a rear drive module, a front drive module, a range extender module, a heat dissipation module, a battery management module and a jack, the cab module, the rear drive module, the front drive module and the range extender module are respectively in electric connection and communication connection with the corresponding jacks, the heat dissipation module is in communication connection with the corresponding jack, a jack corresponding to the battery management module is arranged on the heat dissipation module, and the heat dissipation module is respectively in electric connection and communication connection with the battery management module. The first DC / DC converter is used for providing low-voltage electricity for all modules of the whole vehicle, and the whole vehicle controller VCU is in communication connection with all the modules of the whole vehicle. According to the modular design, scattered electrical components are integrated into units with independent functions, a signal transmission path and interface management are optimized, cross-regional wiring harnesses are reduced, the fault rate is reduced, and plug-and-play replacement is supported.

Description

Technical Field

[0001] This utility model relates to a low-voltage electrical structure suitable for range-extended wide-body vehicles, belonging to the technical field of wide-body vehicles. Background Technology

[0002] Wide-body vehicles are a type of special vehicle designed for high load capacity, wide wheelbase, and high stability. They are mainly used in mining transportation, port logistics, and large-scale engineering construction. Their large body structure typically includes a high-powered powertrain and a high-strength chassis to meet the demands of heavy loads, complex road conditions, and long-term continuous operation. With the popularization of new energy technologies, the powertrain systems of wide-body vehicles are gradually shifting from traditional fuel-powered systems to electrification and hybrid powertrains. Among these, range-extended electric vehicle (REEV) technology, which balances range and environmental friendliness, has become one of the important paths for the electrification of wide-body vehicles.

[0003] The powertrain of a range-extended wide-body vehicle consists of a high-voltage drive system and a range extender. Its low-voltage electrical circuit handles critical functions such as high-voltage system control, energy management, and power supply to onboard equipment. However, because range-extended technology requires simultaneous coordination of the internal combustion engine, generator, battery, and electric motor, the number of control nodes and sensors in its low-voltage electrical circuit is significantly greater than in traditional gasoline or pure electric vehicles, leading to a substantial increase in system complexity. Furthermore, the large size of wide-body vehicles necessitates long-distance low-voltage wiring harnesses that must bypass moving mechanical components such as suspension and steering mechanisms, resulting in complex wiring paths, time-consuming installation, and numerous branch nodes in the harness, making them prone to mechanical interference or bending wear. Troubleshooting requires segment-by-segment inspection of the wiring harness, leading to low repair efficiency. The harsh operating environment of wide-body vehicles further exacerbates the risk of wiring harness aging. Summary of the Invention

[0004] Purpose of the invention: To solve the above-mentioned technical problems, this utility model provides a low-voltage electrical structure suitable for range-extended wide-body vehicles, which integrates scattered electrical components into independent modules, reduces cross-regional wiring harnesses, supports plug-and-play replacement, and improves troubleshooting efficiency.

[0005] Technical Solution: A low-voltage electrical structure suitable for range-extended wide-body vehicles, comprising a frame module, a cab module, a rear-wheel drive module, a front-wheel drive module, a range extender module, a heat dissipation module, and a battery management module. The frame module has connectors corresponding to the cab module, rear-wheel drive module, front-wheel drive module, range extender module, and heat dissipation module, respectively. The cab module, rear-wheel drive module, front-wheel drive module, and range extender module are electrically and communicatively connected to their corresponding connectors. The heat dissipation module is communicatively connected to its corresponding connector. The heat dissipation module also has a connector corresponding to the battery management module, and the heat dissipation module and battery management module are electrically and communicatively connected, respectively.

[0006] It also includes a first DC / DC converter integrated in the front-drive module. The first DC / DC converter provides low-voltage power to all modules of the vehicle, so that the frame module, cab module, rear-drive module, front-drive module, range extender module, heat dissipation module, and battery management module form parallel power circuits and communication circuits.

[0007] The chassis module includes a vehicle control unit (VCU), which is communicatively connected to the cab module, rear-drive module, front-drive module, range extender module, cooling module, and battery management module.

[0008] This invention addresses the issue of system complexity caused by numerous wiring harnesses in low-voltage electrical circuits by incorporating corresponding connectors on the vehicle frame module and modularizing electrical components. These components are connected to the connectors via communication and power lines, forming power and communication circuits. The vehicle control unit (VCU) sends communication commands to other modules, and a first DC / DC converter transforms high-voltage electricity into low-voltage electricity to power the entire vehicle, thus energizing all modules. This modular design effectively alleviates the system complexity problem caused by the numerous wiring harnesses in the low-voltage electrical circuits. Furthermore, by integrating dispersed electrical components into functionally independent units, the modular design optimizes signal transmission paths and interface management, thereby simplifying wiring and reducing failure rates.

[0009] In a preferred embodiment, to avoid the front-drive module being unable to meet power and interface requirements using a single controller, the front-drive module includes an auxiliary multi-function controller, a main multi-function controller, a first drive motor, a second drive motor, a third drive motor, a fourth drive motor, a lifting motor, and a steering motor. The auxiliary multi-function controller is communicatively connected to the lifting motor, the third drive motor, and the fourth drive motor, respectively. The main multi-function controller is communicatively connected to the steering motor, the first drive motor, and the second drive motor, respectively. The first DC / DC converter is integrated with the main multi-function controller. The main multi-function controller outputs high-voltage electricity to the first DC / DC converter, which converts the high-voltage electricity into low-voltage electricity to power all modules of the vehicle.

[0010] Since wide-body vehicles are often used in mining, port and other scenarios, with a load capacity of up to one ton, they require extremely high traction to overcome slopes, mud or loose surfaces. Therefore, four drive motors are installed to meet the extreme load and traction requirements, while also providing power redundancy, improving reliability and avoiding the paralysis of the entire vehicle due to a single point of failure. To meet the power and interface requirements of multi-motor control, a main multi-function controller and an auxiliary multi-function controller are set up to integrate and control the corresponding motors, so as to achieve power and interface adaptation with the corresponding electrical equipment, reduce production costs and improve the stability of the high-voltage system of the whole machine.

[0011] In a preferred embodiment, to achieve full-condition power coverage, the rear-drive module includes a rear-drive motor controller and a rear-drive motor, wherein the rear-drive motor controller and the rear-drive motor are electrically connected and communication connected respectively.

[0012] With a rear-drive motor installed, the front wheels are responsible for steering and traction, while the rear wheels provide propulsion assistance, reducing the turning radius. Based on the real-time load and road friction coefficient, the torque is distributed between the front and rear axles. The rear-drive motor can apply reverse torque to counteract body yaw, improving handling safety and dynamic stability, such as when cornering at high speeds.

[0013] In a preferred embodiment, to address the range anxiety, power demand fluctuations, and adaptability to complex environments of pure electric drive under extreme operating conditions, the range extender module includes an RCU controller, a generator controller, an engine controller, a generator, a start relay, and a preheating relay. The RCU controller is communicatively connected to the generator controller and the engine controller, the generator controller is communicatively connected to the generator, and the engine controller is communicatively connected to the start relay and the preheating relay. The RCU controller, generator controller, engine controller, generator, start relay, and preheating relay are electrically connected to each other.

[0014] The RCU controller receives VCU commands, coordinates the engine and generator controllers, optimizes the power generation strategy, controls fuel injection, ignition timing, and speed to ensure efficient engine operation, the generator controller adjusts the generator excitation current, controls the output voltage / power to match the drive system requirements, the starter relay closes to energize the starter motor and complete the engine cold start, and the preheating relay controls the glow plugs to preheat the engine block in low-temperature environments to ensure reliable starting.

[0015] In a preferred embodiment, to prevent the first battery from running out of power, a manual switch and the first battery are also included. The range extender module, the manual switch, and the first battery are electrically connected in sequence, and the first DC / DC converter is electrically connected to the manual switch. Before the vehicle is officially started, it is powered by the first battery. After the vehicle is officially started, the first DC / DC converter replaces the first battery for power supply, and at the same time, the first DC / DC converter charges the first battery to prevent it from running out of power.

[0016] In a preferred embodiment, in order to dissipate heat from each motor of the vehicle, the heat dissipation module includes a fan, a water pump, a motor cooling water level switch, a fuse box, a power relay, and a second battery. The second battery, the power relay, and the fuse box are electrically connected in sequence. The fan and the water pump are electrically connected to the fuse box. The vehicle controller (VCU) is communicatively connected to the fan, the water pump, and the motor cooling water level switch.

[0017] The vehicle control unit (VCU) sends communication signals to the fan, radiator pump, and motor cooling water level switch to control their operation. At the same time, a fuse box is installed to protect the second battery from damage caused by overcurrent, overvoltage, and overtemperature abnormalities, ensuring the safe operation of the battery.

[0018] In a preferred embodiment, to prevent the second battery from running out of power, a second DC / DC converter is also included. The second DC / DC converter is electrically connected to a power relay and communicatively connected to the vehicle controller (VCU). The auxiliary multi-function controller outputs high-voltage electricity to the second DC / DC converter, which performs high-to-low voltage conversion to power the heat dissipation module and simultaneously charges the second battery.

[0019] In a preferred embodiment, to enable battery monitoring and heat dissipation, the battery management module includes a water-cooled unit, a battery cooling water level switch, a BMS battery management system, and a charging gun. The water-cooled unit is electrically connected to the second battery via a fuse box. The BMS battery management system is communicatively connected to the water-cooled unit and the charging gun, respectively. The water-cooled unit is communicatively connected to the battery cooling water level switch.

[0020] The BMS (Battery Management System) monitors the battery status and sends communication signals for cooling or charging to the water-cooled unit or charging gun. At the same time, the water-cooled unit is connected to a second battery to prevent the battery from being unable to cool down in time in case of power failure in an emergency.

[0021] In a preferred embodiment, to realize the basic data acquisition, illumination and emergency steering functions of the whole vehicle, the frame module also includes a sensor group, a lamp group and front / rear emergency steering motors, and the vehicle controller VCU is communicatively connected to the sensor group, the lamp group and the front / rear emergency steering motors respectively.

[0022] Beneficial effects: The modular design of this utility model integrates scattered electrical components into functionally independent units, optimizes signal transmission paths and interface management, thereby simplifying wiring, effectively alleviating the system complexity caused by numerous wiring harnesses in low-voltage electrical circuits, reducing the failure rate, supporting plug-and-play replacement, and setting up a main / auxiliary multi-in-one controller to avoid the inability of a single controller to meet the power and interface requirements of the front-drive module. The first DC / DC converter and the second DC / DC converter supply power to the whole vehicle and the heat dissipation module respectively, while charging the battery to prevent battery depletion, ensure vehicle driving function, improve reliability, and extend battery life. The range extender module solves the range anxiety, power demand fluctuation and complex environment adaptability problems of pure electric drive under extreme conditions. At the same time, the heat dissipation module and the battery management module respectively dissipate heat from the motor and the battery, improving safety. Attached Figure Description

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

[0024] Figure 1 This is a schematic diagram of the low-voltage electrical structure of this utility model. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] The electrical components within the chassis module 1, rear-wheel drive module 3, front-wheel drive module 4, range extender module 5, and battery management module 7 are all connected by power circuits. Figure 1 All parameters are omitted and not shown. Any electrical appliances within each module can be connected via electrical connection; there is no fixed connection order requirement.

[0029] The internal power connections of each module in this embodiment are as follows:

[0030] Front drive module 4: The auxiliary multi-function controller 41 is electrically connected to the third drive motor 45, the fourth drive motor 46, and the lifting motor 47 respectively; the main multi-function controller 42 is electrically connected to the first drive motor 43, the second drive motor 44, and the steering motor 48 respectively; and the main multi-function controller 42 is electrically connected to the auxiliary multi-function controller 41.

[0031] Range extender module 5: RCU controller 51 is electrically connected to generator controller 52 and engine controller 53 respectively; generator controller 52 is electrically connected to generator 54; engine controller 53 is electrically connected to starter relay 55 and preheating relay 56 respectively.

[0032] Battery Management Module 7: The BMS battery management system 73 is electrically connected to the water-cooled unit 71 and the charging gun 74 respectively. The water-cooled unit 71 is electrically connected to the battery cooling water level switch 72.

[0033] Rear drive module 3: Electrical connection between rear drive motor controller 31 and rear drive motor 32;

[0034] Frame module 1: The vehicle controller VCU11 is electrically connected to the sensor group 12, the light group 13, and the front / rear emergency steering motors 14 respectively.

[0035] like Figure 1 As shown, a low-voltage electrical structure suitable for a range-extended wide-body vehicle includes a frame module 1, a cab module 2, a rear-wheel drive module 3, a front-wheel drive module 4, a range extender module 5, a heat dissipation module 6, and a battery management module 7. The frame module 1 has connectors 8 corresponding to the cab module 2, rear-wheel drive module 3, front-wheel drive module 4, range extender module 5, and heat dissipation module 6, respectively. The cab module 2, rear-wheel drive module 3, front-wheel drive module 4, and range extender module 5 are electrically and communicatively connected to their corresponding connectors 8. The heat dissipation module 6 is communicatively connected to its corresponding connector 8. The heat dissipation module 6 also has a connector 8 corresponding to the battery management module 7, and the heat dissipation module 6 and battery management module 7 are electrically and communicatively connected.

[0036] It also includes a first DC / DC converter 9 integrated in the front drive module 4. The first DC / DC converter 9 provides low-voltage electricity to each module of the vehicle, so that the frame module 1, cab module 2, rear drive module 3, front drive module 4, range extender module 5, heat dissipation module 6, and battery management module 7 form parallel power circuits and communication circuits.

[0037] The chassis module 1 includes a vehicle controller VCU11, which is communicatively connected to the cab module 2, the rear drive module 3, the front drive module 4, the range extender module 5, the heat dissipation module 6, and the battery management module 7.

[0038] By setting corresponding connectors 8 on the frame module 1 and modularizing the electrical components, each component is connected to the connectors 8 via communication and power lines, thus forming power and communication circuits. The vehicle controller VCU 11 sends communication commands to other modules, and the first DC / DC converter 9 converts high-voltage electricity into low-voltage electricity to supply the entire vehicle, thereby powering all modules. This modular design effectively alleviates the system complexity problem caused by numerous wiring harnesses in the low-voltage electrical circuit. By integrating dispersed electrical components into functionally independent units, the modular design optimizes signal transmission paths and interface management, thereby simplifying wiring and reducing the failure rate.

[0039] To avoid the front-drive module 4 being unable to meet power and interface requirements using a single controller, the front-drive module 4 includes an auxiliary multi-function controller 41, a main multi-function controller 42, a first drive motor 43, a second drive motor 44, a third drive motor 45, a fourth drive motor 46, a lifting motor 47, and a steering motor 48. The auxiliary multi-function controller 41 is communicatively connected to the lifting motor 47, the third drive motor 45, and the fourth drive motor 46, respectively. The main multi-function controller 42 is communicatively connected to the steering motor 48, the first drive motor 43, and the second drive motor 44, respectively. The first DC / DC converter 9 is integrated with the main multi-function controller 42. The main multi-function controller 42 outputs high-voltage electricity to the first DC / DC converter 9, which converts the high-voltage electricity into low-voltage electricity to power all modules of the vehicle.

[0040] Since wide-body vehicles are often used in mining, port and other scenarios, with a load capacity of 100-400 tons, they require great traction to overcome slopes, mud or loose roads. Therefore, four drive motors are installed to meet the extreme load and traction requirements, while also providing power redundancy, improving reliability and avoiding the paralysis of the entire vehicle due to a single point of failure. Therefore, in order to meet the power and interface requirements of multi-motor control, a main multi-in-one controller 42 and an auxiliary multi-in-one controller 41 are set up to integrate and control the corresponding motors, so as to achieve power and interface adaptation with the corresponding electrical equipment, reduce production costs and improve the stability of the high-voltage system of the whole machine.

[0041] To achieve full-condition power coverage, the rear drive module 3 includes a rear drive motor controller 31 and a rear drive motor 32, which are electrically connected and communication connected to each other.

[0042] With the rear-drive motor 32 installed, the front wheels are responsible for steering and traction, while the rear wheels provide propulsion assistance, reducing the turning radius. Based on the real-time load and road friction coefficient, the torque is distributed between the front and rear axles. The rear-drive motor 32 can apply reverse torque to counteract body yaw, such as when cornering at high speeds, improving handling safety and dynamic stability. Example 2

[0043] To address the range anxiety, power demand fluctuations, and adaptability to complex environments associated with pure electric drive under extreme conditions, the range extender module 5 includes an RCU controller 51, a generator controller 52, an engine controller 53, a generator 54, a starting relay 55, and a preheating relay 56. The RCU controller 51 is communicatively connected to the generator controller 52 and the engine controller 53, the generator controller 52 is communicatively connected to the generator 54, and the engine controller 53 is communicatively connected to the starting relay 55 and the preheating relay 56. The RCU controller 51, generator controller 52, engine controller 53, generator 54, starting relay 55, and preheating relay 56 are electrically connected to each other.

[0044] RCU controller 51 receives VCU commands, coordinates engine and generator controllers 52, optimizes power generation strategy, engine controller 53 controls fuel injection, ignition timing, and speed to ensure efficient engine operation, generator controller 52 adjusts generator 54 excitation current, controls output voltage / power to match drive system requirements, starter relay 55 closes to energize starter motor and complete engine cold start, and preheating relay 56 controls glow plugs to preheat engine block in low-temperature environments to ensure reliable starting. Example 3

[0045] To prevent the first battery 58 from running out of power, a manual switch 57 and the first battery 58 are also included. The range extender module 5, manual switch 57, and first battery 58 are electrically connected in sequence, and the first DC / DC converter 9 is electrically connected to the manual switch 57. Before the vehicle is officially started, it is powered by the first battery 58. After the vehicle is officially started, the first DC / DC converter 9 replaces the first battery 58 in providing power, and at the same time, the first DC / DC converter 9 charges the first battery 58 to prevent it from running out of power.

[0046] To cool the various motors in the vehicle, the heat dissipation module 6 includes a fan 61, a water pump 62, a motor cooling water level switch 63, a fuse box 64, a power relay 65, and a second battery 66. The second battery 66, the power relay 65, and the fuse box 64 are electrically connected in sequence. The fan 61 and the water pump 62 are electrically connected to the fuse box 64. The vehicle controller VCU11 is communicatively connected to the fan 61, the water pump 62, and the motor cooling water level switch 63.

[0047] The vehicle controller VCU11 sends communication signals to the fan 61, the radiator pump 62, and the motor cooling water level switch 63 to control their opening and closing. At the same time, a fuse box 64 is set up to protect the second battery 66 from damage caused by overcurrent, overvoltage, and overtemperature abnormalities, ensuring the safe operation of the battery. Example 4

[0048] To prevent the second battery 66 from running out of power, a second DC / DC converter 67 is also included. The second DC / DC converter 67 is electrically connected to the power relay 65 and communicatively connected to the vehicle controller VCU11. The auxiliary multi-function controller 41 outputs high voltage to the second DC / DC converter 67. After the second DC / DC converter 67 performs high-low voltage conversion, it supplies power to the heat dissipation module 6 and charges the second battery 66 at the same time.

[0049] To monitor and dissipate heat from the battery, the battery management module 7 includes a water-cooled unit 71, a battery cooling water level switch 72, a battery management system (BMS) 73, and a charging gun 74. The water-cooled unit 71 is electrically connected to the second battery 66 via a fuse box 64. The BMS 73 is communicatively connected to the water-cooled unit 71 and the charging gun 74. The water-cooled unit 71 is communicatively connected to the battery cooling water level switch 72.

[0050] The BMS battery management system 73 monitors the battery status and sends communication signals for heat dissipation or charging to the water-cooled unit 71 or the charging gun 74. At the same time, the water-cooled unit 71 is connected to the second battery 66 to avoid the situation where the battery cannot be cooled in time in case of power failure in an emergency.

[0051] In order to realize the basic data acquisition, illumination and emergency steering functions of the whole vehicle, the frame module 1 also includes a sensor group 12, a lamp group 13 and a front / rear emergency steering motor 14. The vehicle controller VCU11 is communicatively connected to the sensor group 12, the lamp group 13 and the front / rear emergency steering motor 14 respectively.

[0052] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0053] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A low-voltage electrical structure suitable for range-extended wide-body vehicles, characterized in that: The system includes a chassis module (1), a cab module (2), a rear-wheel drive module (3), a front-wheel drive module (4), a range extender module (5), a heat dissipation module (6), and a battery management module (7). The chassis module (1) is provided with connectors (8) corresponding to the cab module (2), the rear-wheel drive module (3), the front-wheel drive module (4), the range extender module (5), and the heat dissipation module (6), respectively. The cab module (2), the rear-wheel drive module (3), the front-wheel drive module (4), and the range extender module (5) are electrically and communicatively connected to their respective connectors (8). The heat dissipation module (6) is communicatively connected to its corresponding connector (8). The heat dissipation module (6) is provided with a connector (8) corresponding to the battery management module (7). The heat dissipation module (6) and the battery management module (7) are electrically and communicatively connected, respectively. It also includes a first DC / DC converter (9) integrated in the front drive module (4), which provides low voltage electricity to each module of the vehicle, so that the frame module (1), cab module (2), rear drive module (3), front drive module (4), range extender module (5), heat dissipation module (6), and battery management module (7) form a parallel power circuit and communication circuit. The chassis module (1) includes a vehicle controller (VCU) (11), which is connected to the cab module (2), the rear drive module (3), the front drive module (4), the range extender module (5), the heat dissipation module (6), and the battery management module (7) respectively.

2. The low-voltage electrical structure for range-extended wide-body vehicles according to claim 1, characterized in that: The front drive module (4) includes an auxiliary multi-function controller (41), a main multi-function controller (42), a first drive motor (43), a second drive motor (44), a third drive motor (45), a fourth drive motor (46), a lifting motor (47), and a steering motor (48). The auxiliary multi-function controller (41) is connected to the lifting motor (47), the third drive motor (45), and the fourth drive motor (46) respectively. The main multi-function controller (42) is connected to the steering motor (48), the first drive motor (43), and the second drive motor (44) respectively. The first DC / DC converter (9) is integrated with the main multi-function controller (42). The main multi-function controller (42) outputs high voltage to the first DC / DC converter (9). The first DC / DC converter (9) converts the high voltage to low voltage and then supplies power to all modules of the vehicle.

3. The low-voltage electrical structure suitable for range-extended wide-body vehicles according to claim 1, characterized in that: The rear drive module (3) includes a rear drive motor controller (31) and a rear drive motor (32), which are electrically connected and communication connected to each other.

4. The low-voltage electrical structure for range-extended wide-body vehicles according to claim 1, characterized in that: The range extender module (5) includes an RCU controller (51), a generator controller (52), an engine controller (53), a generator (54), a starting relay (55), and a preheating relay (56). The RCU controller (51) is communicatively connected to the generator controller (52) and the engine controller (53). The generator controller (52) is communicatively connected to the generator (54). The engine controller (53) is communicatively connected to the starting relay (55) and the preheating relay (56). The RCU controller (51), the generator controller (52), the engine controller (53), the generator (54), the starting relay (55), and the preheating relay (56) are electrically connected to each other.

5. The low-voltage electrical structure suitable for range-extended wide-body vehicles according to claim 4, characterized in that: It also includes a manual switch (57) and a first battery (58). The range extender module (5), the manual switch (57), and the first battery (58) are electrically connected in sequence, and the first DC / DC converter (9) is electrically connected to the manual switch (57).

6. The low-voltage electrical structure for range-extended wide-body vehicles according to claim 2, characterized in that: The heat dissipation module (6) includes a fan (61), a cooling water pump (62), a motor cooling water level switch (63), a fuse box (64), a power relay (65), and a second battery (66). The second battery (66), the power relay (65), and the fuse box (64) are electrically connected in sequence. The fan (61) and the cooling water pump (62) are electrically connected to the fuse box (64) respectively. The vehicle controller VCU (11) is communicatively connected to the fan (61), the cooling water pump (62), and the motor cooling water level switch (63).

7. The low-voltage electrical structure for range-extended wide-body vehicles according to claim 6, characterized in that: It also includes a second DC / DC converter (67), which is electrically connected to a power relay (65) and communicatively connected to the vehicle controller VCU (11). The auxiliary multi-in-one controller (41) outputs high voltage to the second DC / DC converter (67), which then performs high-low voltage conversion to supply power to the heat dissipation module (6) and simultaneously charges the second battery (66).

8. The low-voltage electrical structure for range-extended wide-body vehicles according to claim 7, characterized in that: The battery management module (7) includes a water-cooled unit (71), a battery cooling water level switch (72), a BMS battery management system (73), and a charging gun (74). The water-cooled unit (71) is electrically connected to the second battery (66) through a fuse box (64). The BMS battery management system (73) is communicatively connected to the water-cooled unit (71) and the charging gun (74) respectively. The water-cooled unit (71) is communicatively connected to the battery cooling water level switch (72).

9. The low-voltage electrical structure for range-extended wide-body vehicles according to claim 1, characterized in that: The frame module (1) also includes a sensor group (12), a lamp group (13), and a front / rear emergency steering motor (14). The vehicle controller VCU (11) is connected to the sensor group (12), the lamp group (13), and the front / rear emergency steering motor (14) respectively.

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