Wired Controlled Integrated Electric Drive System and Electric Engineering Vehicle

Abstract

The present invention relates to the technical field of pure electric engineering vehicles, and specifically to a wire-controlled integrated electric drive system and an electric engineering vehicle. The wire-controlled integrated electric drive system includes: at least two axles; an electric powertrain; a vehicle controller and an electric drive axle controller; a wire-controlled braking system; a wire-controlled steering system; a power take-off, which is arranged on the electric powertrain; a hydraulic power-assisted braking system, which is connected to the power take-off and cooperates with the brake to provide auxiliary braking force for the brake; and a hydraulic power-assisted steering system, which is connected to the power take-off and cooperates with the steering gear to provide auxiliary steering force for the steering gear. The wire-controlled integrated electric drive system mainly uses electric steering and electric braking, supplemented by hydraulic power assistance, to achieve dual protection. Steering force is provided by the hydraulic power-assisted steering system, and braking force is provided by the hydraulic power-assisted braking system. This solves the problems of insufficient braking force and steering force of existing electric engineering vehicles, as well as brake failure and steering failure after high-voltage power failure, thereby improving personal and vehicle safety.

Description

Technical Field

[0001] The present invention relates to the technical field of pure electric engineering vehicles, and in particular to a wire-controlled integrated electric drive system and an electric engineering vehicle. Background Art

[0002] At present, the integrated electric drive axles of most commercial vehicles are mainly used for driving and taking power from the upper body of new energy vehicles. The steering of existing commercial vehicles generally adopts electric steering systems. The braking of commercial vehicles mainly adopts electric braking systems (EBS) to achieve electronic control braking and brake energy recovery. In extreme working conditions, such as heavy-loaded downhill driving, there are safety hazards such as insufficient braking force, insufficient steering force, and brake failure and steering failure after high-voltage power failure, which can easily lead to accidents. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art commercial vehicles such as insufficient braking force and steering force under extreme working conditions, as well as safety hazards such as brake failure and steering failure after high-voltage power failure, thereby providing a wire-controlled integrated electric drive system and electric engineering vehicle.

[0004] In order to solve the above problems, the present invention provides a wire-controlled integrated electric drive system, comprising: at least two axles, each axle is connected to wheels at both ends, at least one axle is a steering axle, and at least one axle is a drive axle; an electric powertrain, each drive axle is provided with an electric powertrain; a vehicle controller and an electric drive axle controller, the vehicle controller and the electric drive axle controller are electrically connected, and the electric drive axle controller is electrically connected to the electric powertrain; a wire-controlled braking system, comprising a brake, a brake motor and a brake ECU, the brake motor is connected to the brake, the brake ECU is electrically connected to the brake motor and the vehicle controller, and each Brakes are provided on the wheels; a wire-controlled steering system includes a steering gear, a steering motor and a steering ECU, the steering motor is connected to the steering gear, the steering ECU is electrically connected to the steering motor and the vehicle controller, and a steering gear and a steering motor are provided on the steering axle; a power take-off is provided on the electric powertrain and electrically connected to the electric drive axle controller; a hydraulic power-assisted braking system is connected to the power take-off and cooperates with the brake, and the hydraulic power-assisted braking system is suitable for providing auxiliary braking force for the brake; a hydraulic power-assisted steering system is connected to the power take-off and cooperates with the steering gear, and the hydraulic power-assisted steering system is suitable for providing auxiliary steering force for the steering gear.

[0005] Optionally, the hydraulic power-assisted braking system includes a hydraulic pump, an oil tank and a hydraulic cylinder, the oil inlet of the hydraulic pump is connected to the oil tank, the oil outlet of the hydraulic pump is connected to the hydraulic cylinder, the hydraulic cylinder is connected to the oil tank, and the piston rod of the hydraulic cylinder cooperates with the brake.

[0006] Optionally, hydraulic cylinders are installed on the steering axle.

[0007] Optionally, the hydraulic power steering system includes a hydraulic pump, an oil tank and a hydraulic motor, the oil inlet of the hydraulic pump is connected to the oil tank, the oil outlet of the hydraulic pump is connected to the oil inlet of the hydraulic motor, the oil outlet of the hydraulic motor is connected to the oil tank, and the hydraulic motor is installed on the steering axle.

[0008] Optionally, the hydraulic power-assisted braking system and the hydraulic power-assisted steering system share a common hydraulic pump and tank.

[0009] Optionally, the electric powertrain and drive axle are integrated into an integrated electric drive axle.

[0010] Optionally, there is one power take-off, which is connected to both the hydraulic power-assisted braking system and the hydraulic power-assisted steering system.

[0011] Optionally, there are two or more drive axles, and a power take-off is provided on one drive axle.

[0012] Optionally, there are more than two drive axles and two power take-offs, the power take-off on one drive axle is connected to the hydraulic power-assisted braking system, and the power take-off on the other drive axle is connected to the hydraulic power-assisted steering system.

[0013] The present invention also provides an electric engineering vehicle, comprising the above-mentioned wire-controlled integrated electric drive system.

[0014] The present invention has the following advantages:

[0015] 1. The power take-off (PTO) is installed on the electric powertrain. The hydraulic power-assisted braking system and hydraulic power-assisted steering system draw power from the PTO on the electric powertrain. The VCU sends commands to the steering ECU, which controls the steering motor to achieve steer-by-wire. The VCU also sends commands to the brake ECU, which controls the brake motors, which in turn drive the brakes to achieve brake-by-wire. If the steer-by-wire fails, the VCU sends commands to the EACU, which controls the PTO and uses the hydraulic power-assisted steering system to provide auxiliary steering force to the steering gear, achieving hydraulic power-assisted steering. If the brake-by-wire fails or there is insufficient braking force under conditions such as heavy-load climbing, the hydraulic power-assisted braking system provides auxiliary braking force to achieve hydraulic power-assisted braking. The integrated electric drive-by-wire system primarily uses electric steering and electric braking, supplemented by hydraulic power assistance, achieving dual protection. Steering force is provided by the hydraulic power-assisted steering system, and braking force is provided by the hydraulic power-assisted braking system. This solves the problems of insufficient braking force and steering force in existing electric engineering vehicles, as well as brake and steering failure after a high-voltage power outage, thereby improving personal and vehicle safety.

[0016] 2. The hydraulic power-assisted braking system and the hydraulic power-assisted steering system share the same hydraulic pump and oil tank, which reduces the number of hydraulic pumps and oil tanks, simplifies the structure and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A simplified structural diagram of an electric engineering vehicle according to an embodiment of the present invention is shown.

[0019] Description of reference numerals:

[0020] 10. Axle; 11. Steering axle; 12. Drive axle; 21. Electric powertrain; 22. Power take-off; 31. Vehicle controller; 32. Electric drive axle controller; 41. Brake; 42. Brake ECU; 51. Steering motor; 52. Steering ECU; 61. Hydraulic cylinder; 62. Brake hydraulic assembly; 71. Hydraulic motor; 72. Steering hydraulic assembly; 80. Wheel. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0024] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] like Figure 1 As shown, the wire-controlled integrated electric drive system of this embodiment includes: at least two axles 10, an electric powertrain 21, a vehicle controller 31, an electric drive axle controller 32, a wire-controlled braking system, a wire-controlled steering system, a power take-off 22, a hydraulic power-assisted braking system and a hydraulic power-assisted steering system. Wheels 80 are connected to both ends of each axle 10, at least one axle 10 is a steering axle 11, and at least one axle 10 is a drive axle 12; each drive axle 12 is provided with an electric powertrain 21; the vehicle controller 31 is electrically connected to the electric drive axle controller 32, and the electric drive axle controller 32 is electrically connected to the electric powertrain 21; the wire-controlled braking system includes a brake 41, a brake motor and a brake ECU 42, the brake motor is connected to the brake 41, the brake ECU 42 is electrically connected to the brake motor and the vehicle controller 31, and each wheel 80 is provided with a brake 41; the wire-controlled steering system includes a steering gear, ... The steering axle 11 is provided with a steering motor 51 and a steering ECU 52. The steering motor 51 is connected to the steering gear. The steering ECU 52 is electrically connected to the steering motor 51 and the vehicle controller 31. The steering gear and the steering motor 51 are provided on the steering axle 11. The power take-off 22 is provided on the electric powertrain 21 and is electrically connected to the electric axle controller 32. The hydraulic power-assisted braking system is connected to the power take-off 22 and cooperates with the brake 41. The hydraulic power-assisted braking system is suitable for providing auxiliary braking force for the brake 41. The hydraulic power-assisted steering system is connected to the power take-off 22 and cooperates with the steering gear. The hydraulic power-assisted steering system is suitable for providing auxiliary steering force for the steering gear. It should be noted that ECU is the abbreviation for electronic control unit. The electric axle controller 32 is abbreviated as EACU, and the vehicle controller 31 is abbreviated as VCU.

[0026] The wire-controlled integrated electric drive system of this embodiment is applied, and the power take-off 22 is set on the electric powertrain 21. The hydraulic power-assisted braking system and the hydraulic power-assisted steering system take power from the power take-off 22 on the electric powertrain 21. The VCU sends instructions to the steering ECU 52, and the steering ECU 52 controls the steering motor 51 to realize the vehicle's wire-controlled steering. The VCU sends instructions to the brake ECU 42, and the brake ECU 42 controls each brake motor. The brake motor drives the brake 41 for braking to realize the vehicle's wire-controlled braking; when the wire-controlled steering fails, the VCU sends instructions to the EACU, and the EACU controls the power take-off 22, and then the hydraulic power-assisted steering system provides auxiliary steering force for the steering gear to realize hydraulic power-assisted steering; when the wire-controlled braking fails or there is insufficient braking force or steering force in working conditions such as heavy-load downhill, the hydraulic power-assisted braking system provides auxiliary braking force for the brake 41 to realize hydraulic power-assisted braking. The wire-controlled integrated electric drive system mainly uses electric steering and electric braking, supplemented by hydraulic power assistance, to achieve dual protection. Steering force is provided by the hydraulic power steering system, and braking force is provided by the hydraulic power braking system. It solves the problems of insufficient braking force and steering force of existing electric engineering vehicles, as well as brake failure and steering failure after high-voltage power failure, thereby improving personal and vehicle safety.

[0027] In this embodiment, the hydraulically assisted braking system includes a hydraulic pump, an oil tank, and a hydraulic cylinder 61. The hydraulic pump's oil inlet is connected to the oil tank, and the hydraulic pump's oil outlet is connected to the hydraulic cylinder 61. The hydraulic cylinder 61 is connected to the oil tank, and the piston rod of the hydraulic cylinder 61 cooperates with the brake 41. The hydraulic pump provides power for the entire hydraulic system. The hydraulic pump can be a gear pump, a vane pump, a plunger pump, or a screw pump. The oil tank is used to store hydraulic oil. The hydraulic cylinder 61 is an actuator that converts the pressure of the hydraulic oil into mechanical energy, thereby driving the brake 41 for braking. The hydraulically assisted braking system also includes control elements and auxiliary elements. The control elements control and regulate the pressure, flow, and direction of the hydraulic oil in the hydraulic system. The control elements include pressure control valves, flow control valves, and directional control valves. The auxiliary elements include filters, accumulators, etc. The control valves and auxiliary elements need to be selected according to the specific situation and will not be described in detail here.

[0028] It should be noted that the brake motor can provide braking force for the brake 41 alone, the hydraulic power-assisted braking system can also provide braking force for the brake 41 alone, and the brake motor and the hydraulic power-assisted braking system can also provide braking force for the brake 41 at the same time. The coupling method of the brake motor, the hydraulic power-assisted braking system and the brake 41 is not specifically limited here. As long as at least one of the brake motor and the hydraulic power-assisted braking system can provide braking force for the brake 41, any coupling method is acceptable.

[0029] In this embodiment, the hydraulic cylinder 61 is installed on the steering axle 11, and the hydraulic power-assisted braking system provides auxiliary braking force for the two wheels 80 on the steering axle 11. It is understood that the hydraulic cylinder 61 can also be installed on the drive axle 12, and the hydraulic power-assisted braking system can provide auxiliary braking force for the two wheels 80 on the steering axle 11 and the two wheels 80 on the drive axle 12.

[0030] In this embodiment, the hydraulic power steering system includes a hydraulic pump, a fuel tank, and a hydraulic motor 71. The hydraulic pump's oil inlet is connected to the fuel tank, and the hydraulic pump's oil outlet is connected to the oil inlet of the hydraulic motor 71. The hydraulic motor 71's oil outlet is connected to the fuel tank. The hydraulic motor 71 is mounted on the steering axle 11. The hydraulic pump, which can be a gear pump, vane pump, plunger pump, or screw pump, provides power for the entire hydraulic system. The fuel tank is used to store hydraulic oil. The hydraulic motor 71 is an actuator that converts the hydraulic oil's pressure into mechanical energy, thereby driving the steering gear for steering.

[0031] Specifically, the components of the hydraulic power-assisted braking system other than the hydraulic cylinder 61 and the hydraulic pump form a brake hydraulic assembly 62, and the components of the hydraulic power-assisted steering system other than the hydraulic motor 71 and the hydraulic pump form a steering hydraulic assembly 72. There are three axles 10, namely the front axle, the middle axle and the rear axle. The front axle is the steering axle 11, and the middle axle and the rear axle are the drive axle 12. The electric power assembly 21 and the power take-off 22 are integrated into an electric power take-off assembly. The electric power take-off assembly is installed on the middle axle and the rear axle. The hydraulic cylinder 61 is connected to the power take-off 22 on the rear axle through the brake hydraulic assembly 62, and the hydraulic motor 71 is connected to the power take-off 22 on the middle axle through the steering hydraulic assembly 72. It is understood that, as an alternative embodiment, the hydraulic motor 71 and the hydraulic cylinder 61 are connected to the power take-off 22 on the middle axle via a hydraulic assembly, or the hydraulic motor 71 and the hydraulic cylinder 61 are connected to the power take-off 22 on the rear axle via a hydraulic assembly, or, if the front axle is a steering drive axle, the hydraulic motor 71 and the hydraulic cylinder 61 are connected to the power take-off 22 on the front axle via a hydraulic assembly. It is understood that the combination of the hydraulic motor 71, the hydraulic cylinder 61, and the power take-off 22 on the drive axle 12 is not limited to this.

[0032] It should be noted that in Figure 1 In the figure, the dotted line means that the various components are connected by wires, and the dot-dash line means that the various components are connected by oil pipes.

[0033] In this embodiment, the hydraulic power-assisted braking system and the hydraulic power-assisted steering system share a hydraulic pump and an oil tank, which reduces the number of hydraulic pumps and oil tanks, simplifies the structure, and saves costs.

[0034] In this embodiment, there are three brake ECUs 42 , and two wheels on each axle 10 share one brake ECU 42 . It is understood that each wheel 80 may be provided with one brake ECU 42 , or more than three wheels 80 may share one brake ECU 42 .

[0035] In this embodiment, the electric powertrain 21 and the drive axle 12 are integrated into an integrated electric drive axle. The VCU sends commands to the EACU, which controls each integrated electric drive axle to achieve drive-by-wire. The integrated electric drive axle integrates the axle 10, drive motor, transmission, differential, etc., with high integration, compact structure, and high transmission efficiency. The power of the drive motor directly drives the wheels 80 through the transmission and other mechanisms, enabling automatic speed change and keeping the drive motor operating in a high-efficiency range. The integrated electric drive axle has brake feedback to achieve energy recovery and extend the cruising range. The integrated electric drive axle can adopt the structure of the existing technology and will not be described in detail here.

[0036] In this embodiment, there are two drive axles 12 and two power take-offs 22. The power take-off 22 on one drive axle 12 is connected to the hydraulic power-assisted braking system, while the power take-off 22 on the other drive axle 12 is connected to the hydraulic power-assisted steering system. One power take-off 22 controls the hydraulic power-assisted braking system, while the other controls the hydraulic power-assisted steering system, simplifying the control process. It is understood that, as an alternative embodiment, there is only one power take-off 22, and one power take-off 22 is connected to both the hydraulic power-assisted braking system and the hydraulic power-assisted steering system. In this case, there can be more than two drive axles 12, with only one drive axle 12 having a power take-off 22.

[0037] It should be noted that the number of drive axles 12 may be more than three. In this case, the number of power take-offs 22 is two, with the power take-off 22 on one drive axle 12 connected to the hydraulic power-assisted braking system and the power take-off 22 on the other drive axle 12 connected to the hydraulic power-assisted steering system. Alternatively, the number of power take-off 22 may be one, with the one power take-off 22 connected to both the hydraulic power-assisted braking system and the hydraulic power-assisted steering system. In this case, the number of drive axles 12 may be more than two, with only one drive axle 12 having a power take-off 22. It is understood that the combination of drive axles 12 and power take-offs 22 is not limited to this, and the combination needs to be selected according to the specific situation. The number of drive axles 12 is not limited to this, and needs to be determined according to the vehicle model.

[0038] It should be noted that the electric powertrain 21 includes a drive motor, a transmission, etc. The specific structures of the electric powertrain 21, the power take-off 22, the wire-controlled braking system, the wire-controlled steering system, the electric powertrain 21, the vehicle controller 31, and the electric drive axle controller 32 can adopt the mechanisms in the existing technology and will not be described in detail here.

[0039] All the above controllers can communicate through the CAN network.

[0040] The present invention also provides an electric engineering vehicle including the aforementioned drive-by-wire integrated electric drive system. Based on electronic drive-by-wire, electronic steering-by-wire, and electronic brake-by-wire, the electric engineering vehicle converts kinetic energy from the integrated electric drive axle into hydraulic energy via a power take-off (PTO) 22, providing hydraulic power steering and hydraulic power braking for the front axle. The vehicle exhibits advantages such as intelligence, a simple structure, a small footprint, low cost, high efficiency, and energy conservation and environmental protection.

[0041] In this embodiment, the electric engineering vehicle further includes a vehicle frame, and the electric axle controller 32 and the steering ECU 52 are mounted on the vehicle frame, simplifying installation. It is understood that the electric axle controller 32 and the steering ECU 52 can also be mounted on other components, and their specific locations vary depending on the vehicle model.

[0042] Specifically, electric engineering vehicles include new energy commercial vehicles, cranes, excavators, bulldozers, road rollers, loaders, cranes, etc., and new energy commercial vehicles include trucks, etc.

[0043] The following describes the working mode of electric engineering vehicles:

[0044] The working modes of electric engineering vehicles include electric braking mode, electric steering mode, hydraulic power-assisted braking mode, hydraulic power-assisted steering mode, electro-hydraulic braking mode and electro-hydraulic steering mode;

[0045] When the electric engineering vehicle is in electric braking mode, the VCU sends instructions to the brake ECU 42, which controls each brake motor, and each brake motor controls the corresponding mechanical brake to achieve vehicle wire control.

[0046] When the electric engineering vehicle is in the electric steering mode, the VCU sends instructions to the steering ECU 52, which controls the steering motor 51, and the steering motor 51 controls the steering gear to realize vehicle wire control steering.

[0047] When the electronic brake of the front axle fails, the electric engineering vehicle is in hydraulic assisted braking mode. The VCU sends instructions to the EACU, which controls the power take-off 22 on the rear axle to connect the brake hydraulic assembly 62, start the hydraulic cylinder 61, and provide auxiliary braking for the front axle to achieve hydraulic assisted braking.

[0048] When the electronic steering of the front axle fails and the electric engineering vehicle is in hydraulic power steering mode, the VCU sends instructions to the EACU, which controls the power take-off 22 on the middle axle to connect the steering hydraulic assembly 72, start the hydraulic motor 71, and provide auxiliary steering for the front axle to achieve hydraulic power steering.

[0049] When the electric engineering vehicle is in electro-hydraulic braking mode, the VCU sends instructions to the brake ECU 42 and EACU, and the brake ECU 42 controls the brake motor, and connects the brake hydraulic component 62 by controlling the power take-off 22 on the rear axle, starts the hydraulic cylinder 61, and the brake motor and hydraulic cylinder 61 jointly control the brake 41 to achieve electro-hydraulic braking.

[0050] When the electric engineering vehicle is in electro-hydraulic steering mode, instructions are sent to the steering ECU 52 and EACU through the VCU, and the steering ECU 52 controls the steering motor 51, and connects the steering hydraulic assembly 72 by controlling the power take-off 22 on the middle bridge, starts the hydraulic motor 71, and the steering motor 51 and the hydraulic motor 71 jointly control the steering gear to realize electro-hydraulic steering.

[0051] Electric engineering vehicles utilize SBW and HPS. In addition to electric steering, a power take-off 22 is added to the drive motor, providing hydraulic power steering via a hydraulic assembly. Similarly, hydraulic power steering serves as a backup in the event of electric steering failure. SBW stands for steer-by-wire system, while HPS stands for hydraulic power steering.

[0052] Electric engineering vehicles utilize EMB and EHB. In addition to electric braking, a power take-off (PTO) 22 is added to the drive motor, providing hydraulically assisted braking via hydraulic components. This provides auxiliary braking force in extreme conditions, such as downhill driving with a heavy load, and even after a high-voltage power outage, the hydraulic components can provide a short period of emergency braking, enhancing both personal and vehicle safety. EMB stands for electronic mechanical brake, and EHB stands for electronic hydraulic brake.

[0053] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0054] 1. The wire-controlled integrated electric drive system for new energy commercial vehicles includes an integrated electric drive axle, a power take-off 22, hydraulic components, a brake 41, a brake motor, a hydraulic cylinder 61, a steering motor 51, a hydraulic motor 71, a brake ECU 42, a steering ECU 52, an EACU, and a VCU. The power take-off 22 is integrated with the electric powertrain 21 and installed on the middle and rear axles. The EACU and the steering ECU 52 are installed on the vehicle frame. The hydraulic cylinder 61, the hydraulic motor 71, and the steering motor 51 are installed on the front axle. The brake 41 and the brake ECU 42 are dispersedly arranged on the wheel ends of each wheel 80. The hydraulic components take power from the power take-off 22 of the integrated electric drive axle and output power to achieve auxiliary braking and auxiliary steering, resulting in greater torque. The wire-controlled integrated electric drive system realizes wire-controlled drive, wire-controlled steering, wire-controlled braking, hydraulic power steering, and hydraulic power-assisted braking of the entire electric drive system through data acquisition and intelligent control. It occupies less space, has a simpler structure, low cost, high efficiency, energy saving and environmental protection, and can be widely used in new energy commercial vehicles.

[0055] 2. The wire-controlled integrated electric drive system adopts electronic wire-controlled steering and hydraulic power steering to achieve dual protection. In an emergency, the hydraulic components provide steering force as an emergency backup, improving personal and vehicle safety.

[0056] 3. The wire-controlled integrated electric drive system uses electro-mechanical braking and hydraulic auxiliary braking to provide auxiliary braking force for the vehicle under extreme working conditions. In addition, it can still provide short-term braking force as an emergency backup through hydraulic components after high-voltage power failure, thereby improving personal and vehicle safety.

[0057] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A wire-controlled integrated electric drive system, characterized in that: include: At least two axles (10), each axle (10) having wheels (80) connected at both ends, at least one axle (10) being a steering axle (11), and at least one axle (10) being a drive axle (12); An electric powertrain (21), each of the drive axles (12) being provided with the electric powertrain (21); A vehicle controller (31) and an electric drive bridge controller (32), wherein the vehicle controller (31) and the electric drive bridge controller (32) are electrically connected, and the electric drive bridge controller (32) is electrically connected to the electric powertrain (21); A brake-by-wire system comprises a brake (41), a brake motor and a brake ECU (42), wherein the brake motor is connected to the brake (41), the brake ECU (42) is electrically connected to the brake motor and the vehicle controller (31), and each wheel (80) is provided with the brake (41); A wire-controlled steering system comprises a steering gear, a steering motor (51) and a steering ECU (52), wherein the steering motor (51) is connected to the steering gear, the steering ECU (52) is electrically connected to the steering motor (51) and the vehicle controller (31), and the steering gear and the steering motor (51) are provided on the steering axle (11); A power take-off (22) is provided on the electric powertrain (21) and is electrically connected to the electric drive axle controller (32); a hydraulic booster braking system connected to the power take-off (22) and cooperating with the brake (41), wherein the hydraulic booster braking system is adapted to provide auxiliary braking force for the brake (41); a hydraulic power steering system connected to the power take-off (22) and cooperating with the steering gear, the hydraulic power steering system being adapted to provide auxiliary steering force for the steering gear; The hydraulic booster brake system comprises a hydraulic pump, an oil tank and a hydraulic cylinder (61), wherein the oil inlet of the hydraulic pump is connected to the oil tank, the oil outlet of the hydraulic pump is connected to the hydraulic cylinder (61), the hydraulic cylinder (61) is connected to the oil tank, and the piston rod of the hydraulic cylinder (61) cooperates with the brake (41); The hydraulic power steering system comprises a hydraulic pump, an oil tank and a hydraulic motor (71), wherein the oil inlet of the hydraulic pump is communicated with the oil tank, the oil outlet of the hydraulic pump is communicated with the oil inlet of the hydraulic motor (71), the oil outlet of the hydraulic motor (71) is communicated with the oil tank, and the hydraulic motor (71) is mounted on the steering axle (11).

2. The wire-controlled integrated electric drive system according to claim 1, characterized in that: The hydraulic cylinder (61) is mounted on the steering axle (11).

3. The wire-controlled integrated electric drive system according to any one of claims 1 to 2, characterized in that: The hydraulic power-assisted braking system and the hydraulic power-assisted steering system share the hydraulic pump and the oil tank.

4. The wire-controlled integrated electric drive system according to any one of claims 1 to 2, characterized in that: The electric powertrain (21) and the drive axle (12) are integrated into an integrated electric drive axle.

5. The wire-controlled integrated electric drive system according to any one of claims 1 to 2, characterized in that: The number of the power take-off (22) is one, and one power take-off (22) is connected to both the hydraulic power-assisted braking system and the hydraulic power-assisted steering system.

6. The wire-controlled integrated electric drive system according to claim 5, characterized in that: The number of the drive axles (12) is more than two, and the power take-off (22) is provided on one of the drive axles (12).

7. The wire-controlled integrated electric drive system according to any one of claims 1 to 2, characterized in that: The number of the drive axles (12) is more than two, the number of the power take-offs (22) is two, the power take-off (22) on one drive axle (12) is connected to the hydraulic power-assisted braking system, and the power take-off (22) on the other drive axle (12) is connected to the hydraulic power-assisted steering system.

8. An electric engineering vehicle, characterized in that: A wire-controlled integrated electric drive system comprising the one of claims 1 to 7.

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