A steering wheel system and steering method based on hydraulic control principle

Abstract

This invention discloses a steering wheel system and steering method based on hydraulic control principles. The steering wheel system includes a steering wheel located in the driver's cab of a tracked armored vehicle. It also includes a circuit control module for controlling the working state of the hydraulic cylinders, a hydraulic drive module for providing hydraulic power to the steering system, and an execution module for controlling the working state of the planetary steering gear in the tracked armored vehicle. The circuit control module is arranged corresponding to the steering wheel, the hydraulic drive module is located at the lower part of the tracked armored vehicle corresponding to the steering wheel, and the execution module is located at the planetary steering gear mounting location corresponding to the hydraulic drive module and the circuit control module. The advantages of this invention are that it achieves steering control through an integrated solenoid valve group, resulting in accurate and rapid action, reliable control, and controllable operating force and stroke within a suitable and convenient range for the operator. It is also easy to assemble and disassemble, saving space.

Description

Technical Field

[0001] This invention relates to the field of steering system technology, and in particular to a steering wheel steering system and steering method based on hydraulic control principles. Background Technology

[0002] In existing technologies, tracked vehicle steering systems have generally evolved through stages such as steering clutch-brake, mechanical dual-power flow steering systems, and hydraulic-mechanical dual-power flow differential steering systems. Clutch-brake systems rely on friction between friction elements, making it difficult to achieve an accurate and stable steering radius. They also suffer from drawbacks such as low transmission efficiency, poor reliability, short lifespan, and a limited number of steering radii. Mechanical dual-power flow steering systems offer significantly improved steering performance compared to single-power flow steering mechanisms. However, their steering radius is still stepped; the overall steering mechanism structure is dispersed, complex, and relatively heavy; and the possibility of slippage steering due to partial friction elements and the associated problems cannot be ruled out.

[0003] Currently, tracked armored vehicles use planetary steering mechanisms for steering, mostly relying on lever-based mechanical controls. This presents limitations for steering and other operations during driving. Furthermore, most tracked vehicles still employ mechanical controls for steering and braking. These mechanical controls occupy a large space, have a loose structure, and numerous parts, making maintenance and repair difficult. They require both hands for operation, leading to poor human-machine coordination, high operating force, long travel distances, and driver fatigue. They cannot be controlled via electrical signals or other methods. In modern industry, hydraulic technology has become increasingly stable, offering more flexible and diverse control options, and its continuous development has proven that the steering wheel is a more convenient control method.

[0004] Chinese invention patent application number 202010843240.3 discloses a dual-power flow tracked vehicle drive and steering system, including a control system, a power system, a linear drive system, a steering drive system, and a gear pair system. The power system provides power to the linear drive system and the steering drive system. The control system controls the linear drive system and then the gear pair system to achieve linear drive of the vehicle. The control system controls the steering drive system and then the gear pair system to achieve steering drive of the vehicle. The linear drive system includes a first hydraulic transformer, a one-way valve group I, and a bidirectional fixed displacement pump / motor. The steering drive system includes a second hydraulic transformer, a one-way valve group II, and a bidirectional fixed displacement motor. However, this dual-power flow tracked vehicle drive and steering system has a relatively complex structure with many components, requiring a large installation space, making maintenance and emergency repairs difficult. Furthermore, its components are relatively expensive, resulting in high operating costs. The steering control process is cumbersome, making it difficult for operators to control, and the steering system requires a large amount of energy during steering operations. Summary of the Invention

[0005] The purpose of this invention is to provide a steering wheel system and steering method based on the principle of hydraulic control.

[0006] To achieve the above objectives, the technical solution proposed by this invention is as follows:

[0007] A steering wheel system based on hydraulic control principles includes a steering wheel disposed in the driver's cab of a tracked armored vehicle. It also includes a circuit control module for controlling the operating state of hydraulic cylinders, a hydraulic drive module for providing hydraulic power to the steering system, and an execution module for controlling the operating state of a planetary steering gear in the tracked armored vehicle. The circuit control module is disposed corresponding to the steering wheel, the hydraulic drive module is disposed corresponding to the steering wheel at the lower part of the tracked armored vehicle, and the execution module is disposed corresponding to the hydraulic drive module and the circuit control module at the planetary steering gear mounting location.

[0008] The circuit control module includes a steering switch assembly, a solenoid valve assembly, and a hydraulic cylinder switch assembly. The steering switch assembly is arranged correspondingly to the steering wheel, the solenoid valve assembly is electrically connected to the steering switch assembly, and the hydraulic cylinder switch assembly is electrically connected to the solenoid valve assembly.

[0009] The steering switch assembly includes a first steering limit switch and a second steering limit switch. The first steering limit switch and the second steering limit switch are symmetrically arranged on both sides of the steering wheel. The steering wheel is connected to the first steering limit switch and the second steering limit switch via a mounting base. The first steering limit switch and the second steering limit switch are in a normally open state.

[0010] The solenoid valve assembly includes a first solenoid valve, a second solenoid valve, and a third solenoid valve. The first solenoid valve is electrically connected to the second directional limit switch. The second solenoid valve is arranged in parallel with the first solenoid valve. The third solenoid valve is arranged in parallel with the second solenoid valve and is electrically connected to the first directional limit switch.

[0011] The first solenoid valve, the second solenoid valve, and the third solenoid valve are all two-position three-way solenoid valves and are normally closed. The first solenoid valve, the second solenoid valve, and the third solenoid valve are arranged side by side with intervals to form a cartridge-type two-position three-way solenoid valve assembly.

[0012] The hydraulic cylinder switch assembly includes a first limit switch and a second limit switch. Both the first limit switch and the second limit switch are electrically connected to the second solenoid valve. The first limit switch is normally open, and the second limit switch is normally closed.

[0013] The hydraulic drive module includes a drive hydraulic cylinder, a hydraulic pump, a one-way throttle valve, and a return oil filter. The drive hydraulic cylinder is located at the lower part of the tracked armored vehicle. The hydraulic pump is connected to the drive hydraulic cylinder via an oil circuit. The one-way throttle valve is connected to the hydraulic pump and the third solenoid valve via an oil circuit. The third solenoid valve is connected to the second solenoid valve and the first solenoid valve via an oil circuit. The return oil filter is connected to the drive hydraulic cylinder, the first solenoid valve, the second solenoid valve, and the third solenoid valve via an oil circuit. The first solenoid valve, the second solenoid valve, and the third solenoid valve are all connected to the drive hydraulic cylinder via the return oil filter to form a complete hydraulic circuit.

[0014] The execution module includes a first hydraulic cylinder, a second hydraulic cylinder, a third hydraulic cylinder, and an execution component. The first hydraulic cylinder is arranged corresponding to the first limit switch of the hydraulic cylinder and connected to the first solenoid valve. The second hydraulic cylinder is arranged corresponding to the second solenoid valve and connected to the second solenoid valve. The third hydraulic cylinder is arranged corresponding to the second limit switch of the hydraulic cylinder and connected to the third solenoid valve. The execution component is arranged corresponding to the first hydraulic cylinder, the second hydraulic cylinder, and the third hydraulic cylinder and connected to the planetary steering gear.

[0015] The actuation components include a first brake band, a second brake band, and a lock-up clutch. The first brake band is arranged corresponding to the output end of the first cylinder and connected to the planetary steering gear. The second brake band is arranged corresponding to the output end of the second cylinder and connected to the planetary steering gear. The lock-up clutch is arranged corresponding to the third cylinder and connected to the planetary steering gear.

[0016] A steering method for a steering wheel steering system based on hydraulic control principles includes the following steps:

[0017] a. Movement and Steering: When the tracked armored vehicle needs to turn during movement, turn the steering wheel to activate the first stroke switch, which energizes the third solenoid valve and extends the output end of the corresponding third cylinder, pushing the locking clutch to disengage. When the output end of the third cylinder reaches the end of its stroke, it triggers the second stroke switch, which extends the output end of the second cylinder to engage the second brake band, thus completing the differential movement of the two tracks to enable movement and steering.

[0018] b. Stationary Steering: Based on the driving steering, turn the steering wheel to activate the second travel switch, which energizes the first solenoid valve and extends the output end of the first cylinder. The extended part of the first cylinder triggers the first travel switch of the cylinder. The first travel switch of the cylinder is open, which de-energizes the second solenoid valve and returns it to its original position. At the same time as the second cylinder returns to its original position, the output end of the first cylinder continues to extend to complete the passage. The first brake band locks to perform stationary steering.

[0019] c. Braking: Braking of tracked armored vehicles can be achieved by keeping the first brake band locked while turning on the spot.

[0020] The beneficial effects of this invention are:

[0021] With a simple structure, it includes a circuit control module that controls the hydraulic drive module and the execution module to perform corresponding actions by inputting different electrical signals to complete basic steering and other related actions. It controls steering through an integrated solenoid valve group, which is accurate, rapid, and reliable. The device's response speed and control precision meet the driver's requirements for steering and braking. The hydraulic drive module can be servo controlled to meet the requirements for adjusting braking force during steering and braking. The operating force and travel can be controlled within a suitable and convenient range for the operator. The execution module controls the planetary steering gear through hydraulic cylinders, which can adapt to the severe vibrations and impacts on tracked vehicles. The device is easy to assemble and disassemble, saves space, has fewer parts, and is convenient for vehicle layout. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is the electrical schematic diagram of the present invention;

[0024] Figure 3 This is the hydraulic circuit diagram of the hydraulic drive module of the present invention.

[0025] In the diagram: 1. Steering wheel; 2. First limit switch for steering; 3. Second limit switch for steering; 4. First solenoid valve; 5. Second solenoid valve; 6. Third solenoid valve; 7. First limit switch for hydraulic cylinder; 8. Second limit switch for hydraulic cylinder; 9. Drive hydraulic cylinder; 10. Hydraulic pump; 11. One-way throttle valve; 12. Return oil filter; 13. First hydraulic cylinder; 14. Second hydraulic cylinder; 15. Third hydraulic cylinder; 16. First brake band; 17. Second brake band; 18. Lock-up clutch; P. Oil inlet; T. Oil return port; A. Air outlet. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings.

[0027] A steering system based on hydraulic control principles includes a steering wheel 1, which is disposed in the driver's cab of a tracked armored vehicle. It also includes a circuit control module for controlling the operating state of the hydraulic cylinders, a hydraulic drive module for providing hydraulic power to the steering system, and an execution module for controlling the operating state of the planetary steering gear in the tracked armored vehicle. The circuit control module is arranged correspondingly to the steering wheel 1, the hydraulic drive module is disposed in the lower part of the tracked armored vehicle corresponding to the steering wheel 1, and the execution module is disposed in the planetary steering gear mounting location corresponding to the hydraulic drive module and the circuit control module. A schematic diagram of the overall structure of this invention is shown below. Figure 1 As shown.

[0028] The circuit control module includes a steering switch assembly, a solenoid valve assembly, and a cylinder switch assembly. The steering switch assembly is arranged correspondingly to the steering wheel 1. The solenoid valve assembly is electrically connected to the steering switch assembly, and the cylinder switch assembly is electrically connected to the solenoid valve assembly. The circuit control module, through the cooperation of the steering switch assembly, solenoid valve assembly, and cylinder switch assembly, constitutes the circuit control part of the steering system. The steering switch assembly is used to close when the steering wheel 1 is rotated to form a circuit path, enabling the corresponding electrical components to operate. The solenoid valve assembly is used to control the cylinder to perform corresponding actions. The cylinder switch assembly is used to switch on and off under the action of the corresponding cylinder to realize the on / off state of the corresponding circuit. The electrical schematic diagram of this invention is shown below. Figure 2 As shown.

[0029] The steering switch assembly includes a first steering limit switch 2 and a second steering limit switch 3. The first steering limit switch 2 and the second steering limit switch 3 are symmetrically arranged on both sides of the steering wheel 1. The steering wheel 1 is connected to the first steering limit switch 2 and the second steering limit switch 3 through a mounting base. The first steering limit switch 2 and the second steering limit switch 3 are in a normally open state. The steering switch assembly, through the cooperation of the first steering limit switch 2 and the second steering limit switch 3, acts as a trigger switch for the steering wheel 1 to open or close according to the rotation direction and rotation angle of the steering wheel 1. The first steering limit switch 2 is used to control the on / off state of the third solenoid valve 6, and the second steering limit switch 3 is used to control the on / off state of the first solenoid valve 4. The first steering limit switch 2 and the second steering limit switch 3 are triggered and closed when the steering wheel 1 is rotated.

[0030] The solenoid valve assembly includes a first solenoid valve 4, a second solenoid valve 5, and a third solenoid valve 6. The first solenoid valve 4 is electrically connected to a second directional limit switch 3. The second solenoid valve 5 is arranged in parallel with the first solenoid valve 4. The third solenoid valve 6 is arranged in parallel with the second solenoid valve 5 and is electrically connected to a first directional limit switch 2. The solenoid valve assembly, through the cooperation of the first solenoid valve 4, the second solenoid valve 5, and the third solenoid valve 6, performs corresponding actions under the action of the directional switch assembly to control the corresponding hydraulic cylinder to perform extension and retraction actions. Specifically, the first solenoid valve 4 controls the first hydraulic cylinder 13, the second solenoid valve 5 controls the second hydraulic cylinder 14, and the third solenoid valve 6 controls the third hydraulic cylinder 15.

[0031] The first solenoid valve 4, the second solenoid valve 5, and the third solenoid valve 6 are all two-position three-way solenoid valves and are normally closed. The first solenoid valve 4, the second solenoid valve 5, and the third solenoid valve 6 are arranged in parallel and spaced apart to form a cartridge-type two-position three-way solenoid valve assembly. The cartridge-type two-position three-way solenoid valve assembly is easy to install and easy for staff to inspect and maintain.

[0032] The hydraulic cylinder switch assembly includes a first limit switch 7 and a second limit switch 8. Both the first limit switch 7 and the second limit switch 8 are electrically connected to the second solenoid valve 5. The first limit switch 7 is normally open, and the second limit switch 8 is normally closed. The hydraulic cylinder switch assembly controls the on / off state of the circuit corresponding to the hydraulic cylinder through the cooperation of the first limit switch 7 and the second limit switch 8. Specifically, the first limit switch and the second limit switch are used to control the on / off state of the circuit of the second hydraulic cylinder 14. When the output end of the first hydraulic cylinder 13 extends, the first limit switch 7 closes the circuit. When the output end of the third hydraulic cylinder 15 extends, the second limit switch 8 opens the circuit.

[0033] The hydraulic drive module includes a drive hydraulic cylinder 9, a hydraulic pump 10, and a one-way throttle valve 11. The drive hydraulic cylinder 9 is located at the lower part of the tracked armored vehicle. The hydraulic pump 10 is connected to the drive hydraulic cylinder 9 via an oil circuit. The one-way throttle valve 11 is connected to the hydraulic pump 10 and a third solenoid valve 6 via an oil circuit. The third solenoid valve 6 is connected to the second solenoid valve 5 and a first solenoid valve 4 via an oil circuit. The hydraulic drive module, through the cooperation of the drive hydraulic cylinder 9, the hydraulic pump 10, and the one-way throttle valve 11, serves as the hydraulic drive part of the steering system. Specifically, the drive hydraulic cylinder 9 acts as the hydraulic drive device in the steering system, the hydraulic pump 10 guides hydraulic oil into the solenoid valve assembly under the action of the drive hydraulic cylinder 9, and the one-way throttle valve 11 guides hydraulic oil into the solenoid valve assembly under the action of the hydraulic pump 10. The working oil circuit diagram of the hydraulic drive module of this invention is shown below. Figure 3 As shown.

[0034] It also includes a return oil filter 12, which is connected to the oil circuit of the drive hydraulic cylinder 9, the first solenoid valve 4, the second solenoid valve 5 and the third solenoid valve 6. The first solenoid valve 4, the second solenoid valve 5 and the third solenoid valve 6 are all connected to the oil circuit of the drive hydraulic cylinder 9 through the return oil filter 12 to form a complete hydraulic oil circuit. The return oil filter 12 is used to filter the hydraulic oil in the return oil circuit of the solenoid valve assembly.

[0035] The execution module includes a first hydraulic cylinder 13, a second hydraulic cylinder 14, a third hydraulic cylinder 15, and an execution component. The first hydraulic cylinder 13 is correspondingly arranged with the first limit switch 7 and connected to the first solenoid valve 4. The second hydraulic cylinder 14 is correspondingly arranged with the second solenoid valve 5 and connected to the second solenoid valve 5. The third hydraulic cylinder 15 is correspondingly arranged with the second limit switch 8 and connected to the third solenoid valve 6. The execution component is correspondingly arranged with the first hydraulic cylinder 13, the second hydraulic cylinder 14, and the third hydraulic cylinder 15 and connected to the planetary steering gear. The execution module operates through the first hydraulic cylinder 13, the second hydraulic cylinder 14, and the third hydraulic cylinder 15. 5. In conjunction with the actuator, the working state of the planetary steering gear is controlled by the circuit control module and the hydraulic drive module. The first cylinder 13 is extended under the action of the first solenoid valve 4, the second cylinder 14 is extended under the action of the second solenoid valve 5, and the third cylinder 15 is extended under the action of the third solenoid valve 6. The working state of the planetary steering gear is controlled by the extension and retraction state of the cylinder output end. The actuator is used to perform corresponding actions under the action of the first cylinder 13, the second cylinder 14, and the third cylinder 15 to control the working state of the planetary steering gear.

[0036] The actuation components include a first brake band 16, a second brake band 17, and a locking clutch 18. The first brake band 16 is arranged correspondingly to the output end of the first cylinder 13 and connected to the planetary steering gear. The second brake band 17 is arranged correspondingly to the output end of the second cylinder 14 and connected to the planetary steering gear. The locking clutch 18 is arranged correspondingly to the third cylinder 15 and connected to the planetary steering gear. The actuation components cooperate through the first brake band 16, the second brake band 17, and the locking clutch 18 to perform corresponding actions under the action of the first cylinder 13, the second cylinder 14, and the third cylinder 15 to control the working state of the planetary steering gear. Specifically, the first brake band 16 is used to lock under the action of the first cylinder 13 to perform a turn in place. The second brake band 17 is used to lock under the action of the second cylinder 14 to complete the differential speed of the two tracks and make them turn. The locking clutch 18 is used to ensure that the tracked armored vehicle can start smoothly.

[0037] A steering method for a steering wheel 1 system based on hydraulic control principles includes the following steps:

[0038] a. Movement and Steering: When the tracked armored vehicle needs to turn during movement, turn the steering wheel 1 to activate the first travel switch 2, which will energize the third solenoid valve 6 and extend the output end of the corresponding third cylinder 15, pushing the locking clutch 18 to disengage. When the output end of the third cylinder 15 reaches the end of its travel, it will trigger the second travel switch 8, which will extend the output end of the second cylinder 14 to engage the second brake band 17, thus completing the differential movement of the two tracks to enable movement and steering.

[0039] b. Stationary Steering: Based on the driving steering, turn the steering wheel 1 to trigger the second travel switch 3 to close, energizing the first solenoid valve 4 and extending the output end of the first cylinder 13. The extended part of the first cylinder 13 triggers the first travel switch 7 of the cylinder. The first travel switch 7 of the cylinder is open, causing the second solenoid valve 5 to be de-energized and return to its original position. At the same time as the second cylinder 14 returns to its original position, the output end of the first cylinder 13 continues to extend to complete the passage. The first brake band 16 locks to perform stationary steering.

[0040] c. Braking: Braking of the tracked armored vehicle can be achieved by keeping the first brake band 16 locked while turning on the spot.

[0041] In this technical solution, the electrical components are electrically connected to the power supply of the tracked armored vehicle.

[0042] Working principle:

[0043] Hydraulic cylinders replace traditional lever-type mechanical operation. Electrical signals are transmitted via steering wheel 1 to control a solenoid valve assembly. The solenoid valve assembly then performs corresponding actions to control the planetary steering gear via the hydraulic cylinders, thus achieving steering. Different electrical signals are input to control the hydraulic cylinders to perform corresponding actions on the clutch, brake band, and other functions of the entire planetary steering gear, completing basic steering and other related actions. The hydraulic power steering device, composed of a circuit control module, a hydraulic drive module, and an execution module, replaces the traditional mechanical operation device. On the one hand, the device's response speed and control precision meet the driver's steering and braking operation requirements. On the other hand, the hydraulic power steering device can perform servo control, meeting the braking force adjustment requirements during steering and braking, adapting to the severe vibrations and impacts on tracked vehicles. It has a simple structure, saves space, facilitates vehicle layout, and the operating force and travel can be controlled within a suitable and convenient range for the operator.

[0044] It uses hydraulic cylinders to complete steering and braking, and controls the steering wheel 1 rotation angle with a control point signal. The steering wheel 1 lever requires less effort than a traditional lever. Compared with the traditional mechanical transmission method that requires two different mechanisms for steering, it is more effortless and has higher transmission efficiency. The hydraulic system completes the actions of each component. Modern hydraulic control is precise, and its performance is guaranteed compared to mechanical control. Furthermore, the electrical signal control in this solution can be connected to intelligent control, providing a foundation for the future development of autonomous and intelligent driving.

[0045] The advantages of this invention are its simple structure, the presence of a circuit control module that controls the hydraulic drive module and the execution module to perform corresponding actions by inputting different electrical signals to complete basic steering and other related actions. Steering is controlled by an integrated solenoid valve group, resulting in accurate and rapid action, reliable control, and a response speed and control precision that meet the driver's requirements for steering and braking. The hydraulic drive module allows for servo control, meeting the requirements for adjusting braking force during steering and braking. The operating force and stroke can be controlled within a suitable and convenient range for the operator. The execution module controls the planetary steering gear via a hydraulic cylinder, adapting to severe vibrations and impacts on tracked vehicles. The device is easy to assemble and disassemble, saves space, has fewer parts, and is convenient for vehicle layout.

[0046] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A steering method for a steering wheel steering system based on hydraulic control principles, characterized in that, Includes the following steps: a. Travel and turn: When the tracked armored vehicle needs to turn during travel, turn the steering wheel (1) to activate the first travel switch (2) to close, so that the third solenoid valve (6) is energized and the output end of the corresponding third cylinder (15) extends out, pushing the locking clutch (18) to disengage. When the output end of the third cylinder (15) extends to the end of the travel, it triggers the second travel switch (8) of the cylinder, so that the output end of the second cylinder (14) extends out to make the second brake band (17) tighten, completing the differential travel of the two tracks to make it travel and turn. b. Stationary turning: Based on the driving turning, turn the steering wheel (1) to trigger the second travel switch (3) to close, so that the first solenoid valve (4) is energized and the output end of the first cylinder (13) is extended. The extended part of the first cylinder (13) triggers the first travel switch (7) of the cylinder. The first travel switch (7) of the cylinder is open, so that the second solenoid valve (5) is de-energized and returns to its original position. At the same time as the second cylinder (14) returns to its original position, the output end of the first cylinder (13) continues to extend to complete the passage. The first brake band (16) locks to perform stationary turning. c. Braking: Braking of the tracked armored vehicle can be achieved by keeping the first brake band (16) locked while turning in place; The first limit switch (7) of the hydraulic cylinder is normally open, and the second limit switch (8) of the hydraulic cylinder is normally closed.

2. A steering wheel system based on hydraulic control principle, controlled by the steering method as described in claim 1, comprising a steering wheel (1), the steering wheel (1) being disposed in the driver's cab of a tracked armored vehicle, characterized in that, It also includes a circuit control module for controlling the working state of the hydraulic cylinder, a hydraulic drive module for providing hydraulic power to the steering system, and an execution module for controlling the working state of the planetary steering gear in the tracked armored vehicle. The circuit control module is arranged corresponding to the steering wheel (1), the hydraulic drive module is arranged corresponding to the steering wheel (1) at the lower part of the tracked armored vehicle, and the execution module is arranged corresponding to the hydraulic drive module and the circuit control module at the planetary steering gear mounting location.

3. A steering wheel system based on hydraulic control principle as described in claim 2, characterized in that, The circuit control module includes a direction switch assembly, a solenoid valve assembly, and a cylinder switch assembly. The direction switch assembly includes a first direction travel switch (2) and a second direction travel switch (3). The first direction travel switch (2) and the second direction travel switch (3) are symmetrically arranged on both sides of the steering wheel (1). The steering wheel (1) is connected to the first direction travel switch (2) and the second direction travel switch (3) through a mounting block. The first direction travel switch (2) and the second direction travel switch (3) are in the normally open state.

4. A steering wheel system based on hydraulic control principle as described in claim 3, characterized in that, The solenoid valve assembly includes a first solenoid valve (4), a second solenoid valve (5), and a third solenoid valve (6). The first solenoid valve (4) is electrically connected to the second directional limit switch (3). The second solenoid valve (5) is arranged in parallel with the first solenoid valve (4). The third solenoid valve (6) is arranged in parallel with the second solenoid valve (5) and is electrically connected to the first directional limit switch (2).

5. A steering wheel system based on hydraulic control principle as described in claim 4, characterized in that, The cylinder switch assembly includes a first limit switch (7) and a second limit switch (8), both of which are electrically connected to the second solenoid valve (5).

6. A steering wheel system based on hydraulic control principle as described in claim 5, characterized in that, The execution module includes a first cylinder (13), a second cylinder (14), a third cylinder (15), and an execution component. The first cylinder (13) is arranged corresponding to the first cylinder limit switch (7) and connected to the first solenoid valve (4). The second cylinder (14) is arranged corresponding to the second solenoid valve (5) and connected to the second solenoid valve (5). The third cylinder (15) is arranged corresponding to the second cylinder limit switch (8) and connected to the third solenoid valve (6). The execution component is arranged corresponding to the first cylinder (13), the second cylinder (14), and the third cylinder (15) and connected to the planetary steering gear.

7. A steering wheel system based on hydraulic control principle as described in claim 6, characterized in that, The actuation components include a first brake band (16), a second brake band (17), and a lock-up clutch (18). The first brake band (16) is arranged corresponding to the output end of the first cylinder (13) and connected to the planetary steering gear. The second brake band (17) is arranged corresponding to the output end of the second cylinder (14) and connected to the planetary steering gear. The lock-up clutch (18) is arranged corresponding to the third cylinder (15) and connected to the planetary steering gear.

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