Hydraulic power cylinder, stroke control method, and vehicle

Abstract

The present application relates to a kind of hydraulic pressure boost cylinder, stroke control method and vehicle, it includes: cylinder, piston is equipped in the cylinder, the piston will the inner portion of the cylinder be divided into first cavity and second cavity;Control valve, the control valve has valve core, and the control valve is equipped with oil inlet;And controller, the controller is used to control the valve core rotation preset angle according to the target angle of vehicle required, make the oil inlet with the first cavity or the second cavity communication;The controller is also used to control the flow of hydraulic oil from the oil inlet into the first cavity or the second cavity.By controller can control the rotation angle of valve core, make the oil inlet with the first cavity or the second cavity communication, and then hydraulic oil can from oil inlet into the first cavity or second cavity, and push piston moves, by the flow of hydraulic oil of quantitative control, and then control the movement of the piston, realize the stroke controllable of hydraulic pressure boost cylinder.

Description

Technical Field

[0001] This invention relates to the field of commercial vehicle technology, and in particular to a hydraulic power steering cylinder, a stroke control method, and a vehicle. Background Technology

[0002] With the continuous development of the automotive industry, vehicle usage is constantly increasing, and people's requirements for vehicle comfort and safety are also constantly rising. The clutch and braking system of a vehicle plays a very important role in the process of vehicle use, and the hydraulic power cylinder is a device used to assist in the operation of the vehicle's clutch and braking system.

[0003] In related technologies, the stroke of the power steering cylinder is generally controlled by a linkage system. This linkage connects the steering gear arm, steering axle 1, second arm, and steering axle 2. The steering angle is input through the steering gear input shaft, which drives the steering arm to swing. The steering arm drives the second arm through the intermediate linkage. The second arm is connected to the hydraulic power steering cylinder to realize the stroke control of the power steering cylinder.

[0004] However, the use of linkages increases the number and weight of parts, especially the steering axle, which is far from the steering gear and is not convenient to arrange.

[0005] Therefore, it is necessary to design a new hydraulic power-assisted cylinder, a stroke control method, and a vehicle to overcome the above problems. Summary of the Invention

[0006] This invention provides a hydraulic power-assisted cylinder, a stroke control method, and a vehicle to solve the problem in related technologies where the stroke control of the power-assisted cylinder is connected by a linkage, which increases the number and weight of parts and makes it inconvenient to arrange.

[0007] In a first aspect, a hydraulic power-assisted cylinder is provided, comprising: a cylinder body, wherein a piston is disposed within the cylinder body, the piston dividing the interior of the cylinder body into a first cavity and a second cavity; a control valve having a valve core and an oil inlet; and a controller, the controller being configured to control the valve core to rotate by a preset angle according to a target turning angle required by the vehicle, thereby connecting the oil inlet to the first cavity or the second cavity; the controller is further configured to control the flow rate of hydraulic oil entering the first cavity or the second cavity from the oil inlet.

[0008] In some embodiments, a stall motor is mounted on the cylinder body, and the stall motor is signal-connected to the controller; the control valve includes an elastic rod fixed to the cylinder body, one end of the valve core is fixed to the elastic rod, and the other end is connected to the stall motor; the controller controls the rotation angle of the valve core by controlling the current of the stall motor.

[0009] In some embodiments, the valve core has a groove on its outer surface, and the control valve further includes: a valve housing, the valve housing having the oil inlet and multiple oil passages inside the valve housing; a valve body, the valve body being fixed inside the valve housing, the valve body having an oil passage hole communicating with the corresponding oil passage; the controller is used to control the rotation of the valve core, so that the groove communicates with the oil inlet and the first cavity simultaneously through the corresponding oil passage and the oil passage hole; or so that the groove communicates with the oil inlet and the second cavity simultaneously through the corresponding oil passage and the oil passage hole.

[0010] In some embodiments, a limiting groove is provided outside the valve core, and the hydraulic booster cylinder further includes a limiting mechanism. The limiting mechanism is at least partially located within the limiting groove, and there is a gap between the inner wall of the limiting groove and the limiting mechanism. The limiting mechanism is used to limit the rotation angle of the valve core.

[0011] In some embodiments, a displacement sensor is also provided on the cylinder block. The displacement sensor is used to detect the actual position of the piston and convert the position of the piston into an electrical signal and transmit it to the controller. The controller is also used to correct the rotation angle of the valve core based on the feedback of the actual position of the piston, so that the vehicle turns to the target angle.

[0012] Secondly, a stroke control method for a hydraulic power-assisted cylinder is provided, wherein a piston is provided inside the cylinder body of the hydraulic power-assisted cylinder, and the piston divides the interior of the cylinder body into a first chamber and a second chamber. The stroke control method includes the following steps: controlling the valve core of the control valve to rotate by a preset angle according to the target turning angle required by the vehicle, so that the oil inlet of the control valve is connected to the first chamber or the second chamber, and driving hydraulic oil to enter the cylinder body from the oil inlet to push the piston to move a certain distance.

[0013] In some embodiments, the stroke control method further includes: controlling the valve core to rotate a preset angle according to the target turning angle required by the vehicle and the axle load of the steering shaft, so that the oil inlet of the control valve is connected to the first cavity or the second cavity, and driving hydraulic oil from the oil inlet into the cylinder to push the piston to move a certain distance.

[0014] In some embodiments, one end of the valve core is connected to a stall motor, and the other end is fixed to an elastic rod; controlling the valve core to rotate by a preset angle according to the target turning angle required by the vehicle includes: controlling the current of the stall motor according to the target turning angle required by the vehicle, so that the stall motor drives the valve core to rotate by a preset angle.

[0015] In some embodiments, the stroke control method further includes: detecting the actual position of the piston and correcting the rotation angle of the valve core based on the feedback of the actual position of the piston, so that the vehicle's turning angle reaches the target turning angle.

[0016] Thirdly, a vehicle is provided, the vehicle including a frame and the aforementioned hydraulic power-assisted cylinder mounted on the frame.

[0017] The beneficial effects of the technical solution provided by this invention include:

[0018] This invention provides a hydraulic power-assisted cylinder, a stroke control method, and a vehicle. Because a control valve and a controller are provided, the rotation angle of the valve core can be controlled by the controller, allowing the oil inlet to connect with either the first or second cavity. Hydraulic oil can then enter the first or second cavity from the oil inlet, pushing the piston to move. By quantitatively controlling the flow rate of the hydraulic oil, the amount of piston movement is controlled, thus achieving controllable stroke of the hydraulic power-assisted cylinder. Therefore, it eliminates the need for a rod-connected system to control the stroke of the hydraulic power-assisted cylinder, solving the problem of inconvenient arrangement. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a hydraulic power-assisted cylinder provided in an embodiment of the present invention;

[0021] Figure 2 This is a partial cross-sectional schematic diagram of a hydraulic power-assisted cylinder provided in an embodiment of the present invention;

[0022] Figure 3 A side view schematic diagram of a hydraulic power-assisted cylinder provided in an embodiment of the present invention;

[0023] Figure 4 This is a side view schematic diagram of a control valve provided in an embodiment of the present invention.

[0024] In the picture:

[0025] 1. Cylinder block; 11. Piston rod; 12. First oil port; 13. Second oil port;

[0026] 2. Control valve; 21. Valve core; 211. Limit groove;

[0027] 22. Valve housing; 221. Oil inlet; 222. Oil return port; 223. Front chamber oil port; 224. Rear chamber oil port; 225. First oil passage; 226. Second oil passage; 227. Third oil passage; 228. Fourth oil passage;

[0028] 23. Valve body; 24. End cap; 25. Limiting mechanism;

[0029] 3. Controller; 31. First connector; 32. Second connector;

[0030] 4. Stalled rotor motor; 41. Motor housing; 42. Motor rotor; 43. Motor stator;

[0031] 5. Elastic rod; 6. Displacement sensor. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] This invention provides a hydraulic power-assisted cylinder, a stroke control method, and a vehicle, which can solve the problem in related technologies where the stroke control of the power-assisted cylinder is connected by a linkage, increasing the number and weight of parts and making it inconvenient to arrange.

[0034] See Figures 1 to 2 As shown, a hydraulic power-assisted cylinder provided in an embodiment of the present invention may include: a cylinder body 1, wherein a piston is provided inside the cylinder body 1, the piston divides the interior of the cylinder body 1 into a first cavity and a second cavity, and the piston can move along the axis of the cylinder body 1 within the cylinder body 1, the piston may be connected to a piston rod 11, one end of the piston rod 11 extending outside the cylinder body 1; and a control valve 2, wherein the control valve 2 may be installed on the cylinder body 1 or may be spaced apart from the cylinder body 1, the control valve 2 has a valve core 21, and the control valve 2 has an oil inlet 221, wherein the control valve 2 may include a valve housing 22, the oil inlet 221 may be disposed on the valve housing 22, and the valve core 21 may be disposed inside the valve housing 22. Of course, in some optional embodiments, the oil inlet 221 may also be disposed on the valve core 21 and can rotate with the valve core 21.

[0035] The system includes a controller 3, which can be directly or indirectly connected to the valve core 21. The controller 3 can control the valve core 21 to rotate by a preset angle according to the target turning angle required by the vehicle, so that the oil inlet 221 is connected to the first cavity or the second cavity. The oil inlet 221 can be directly or indirectly connected to the first cavity or the second cavity. When the oil inlet 221 is connected to the first cavity, hydraulic oil can enter the first cavity from the oil inlet 221, thereby driving the piston to move towards the second cavity. When the oil inlet 221 is connected to the second cavity, hydraulic oil can enter the second cavity from the oil inlet 221, thereby driving the piston to move towards the first cavity. The controller 3 is also used to control the flow rate of hydraulic oil entering the first cavity or the second cavity from the oil inlet 221. By controlling the flow rate of hydraulic oil entering the first cavity or the second cavity, the piston movement can be controlled, thereby quantitatively controlling the stroke of the hydraulic power cylinder and achieving controllable stroke of the hydraulic power cylinder. The oil inlet 221 can be connected to a hydraulic pump, which can pump hydraulic oil into the oil inlet 221, so that the hydraulic oil enters the cylinder 1.

[0036] In this embodiment, a control valve 2 and a controller 3 are installed on the hydraulic booster cylinder. The controller 3 can control the rotation angle of the valve core 21, allowing the oil inlet 221 to connect with either the first or second cavity. Hydraulic oil can then enter the first or second cavity through the oil inlet 221, pushing the piston to move closer to either the second or first cavity. By quantitatively controlling the flow rate of the hydraulic oil, the piston's movement is controlled, thus making the stroke of the hydraulic booster cylinder controllable. Therefore, a rod-like connection is not required to control the stroke of the hydraulic booster cylinder, solving the problem of inconvenient arrangement. The hydraulic oil pushes the piston to perform work. When oil enters the first cavity, the hydraulic booster cylinder is in a compressed state; when oil enters the second cavity, it is in an extended state.

[0037] Furthermore, in related technologies, a linkage connection is used, and the stroke of the power steering cylinder and the steering gear angle are fixed. Adjustment must be made through the linkage, which cannot be changed in real time to cope with different working conditions. In this embodiment, the angle of the valve core 21 can be adjusted in real time through the control of the controller 3, and the stroke of the hydraulic power steering cylinder can be changed in real time to cope with different working conditions.

[0038] In some embodiments, see Figure 1 and Figure 2As shown, a stall motor 4 can be installed on the cylinder body 1. The stall motor 4 is signal-connected to the controller 3, and the controller 3 can control the stall motor 4. The control valve 2 can include an elastic rod 5 fixed to the cylinder body 1. Here, "fixed" can be understood as direct or indirect fixation. In this embodiment, it is preferable to fix the stall motor 4 to the cylinder body 1 and fix the elastic rod 5 to the housing of the stall motor 4. Furthermore, the control valve 2 can have a valve shell 22, which is fixed to the housing of the stall motor 4, and the elastic rod 5 is fixed to the valve shell 22.

[0039] One end of the valve core 21 can be fixed to the elastic rod 5, and the other end is connected to the stall motor 4. That is, one end of the valve core 21 is relatively fixed to the elastic rod 5, and the other end of the valve core 21 can rotate together with the stall motor 4. The elastic rod 5 is a rod with a certain degree of elasticity and can undergo a certain degree of torsion. The controller 3 controls the rotation angle of the valve core 21 by controlling the current of the stall motor 4. The controller 3 can control the magnitude and direction of the current of the stall motor 4, so that the stall motor 4 outputs torque of different magnitudes and directions. In this embodiment, since an elastic rod 5 is provided at one end of the valve core 21, when the stall motor 4 is energized, the valve core 21 rotates, and the elastic rod 5 can generate a resistance torque. The torque output by the stall motor 4 can overcome the torque of the elastic rod 5 and control the rotation angle of the valve core 21. Furthermore, the rotation angle of the valve core 21 increases with the increase of the torque applied to the valve core 21 (that is, the torque acting on the valve core 21 after overcoming the torque of the elastic rod 5). By designing the stiffness of the elastic rod 5 and controlling the current of the stall motor 4, the rotation angle of the valve core 21 can be adjusted, thereby controlling the opening degree of the control valve 2.

[0040] Furthermore, the elastic rod 5 has a certain degree of elasticity. When the stall motor 4 is de-energized, the elastic rod 5 can automatically drive the valve core 21 to reset to a free state, that is, the elastic rod 5 is not under force.

[0041] Preferably, the stall motor 4 may include a motor housing 41, permanent magnet poles, a motor rotor 42, and a motor stator 43. The motor stator 43, motor rotor 42, and permanent magnet poles are installed inside the motor housing 41, and the motor housing 41 may be fixed to the cylinder body 1. The controller 3 may also be installed on the cylinder body 1. The controller 3 may be provided with a first connector 31 and a second connector 32. The first connector 31 is used for control and wake-up, and the second connector 32 is used for power supply.

[0042] Furthermore, the first cavity can be the front cavity of the cylinder 1, and the second cavity can be the rear cavity of the cylinder 1. The cylinder 1 can be provided with a first oil port 12 corresponding to the first cavity, and the first oil port 12 is connected to the first cavity. The cylinder 1 can be provided with a second oil port 13 corresponding to the second cavity, and the second oil port 13 is connected to the second cavity. The control valve 2 can be a three-position four-way valve, which plays a role in flow distribution. The valve body 22 can be provided with a front cavity oil port 223 and a rear cavity oil port 224. The front cavity oil port 223 is connected to the first oil port 12 through a pipe, and the rear cavity oil port 224 is connected to the second oil port 13 through a pipe.

[0043] In some embodiments, see Figure 2 and Figure 3 As shown, the valve core 21 may have a groove on its outer surface. The control valve 2 may further include a valve housing 22, on which the oil inlet 221 is provided. The valve housing 22 may also have an oil return port 222. The valve housing 22 has multiple oil passages inside, which may include a first oil passage 225, a second oil passage 226, a third oil passage 227, and a fourth oil passage 228. The first oil passage 225 is connected to the front chamber oil port 223, and the second oil passage 226 is connected to the rear chamber oil port 228. 24. The third oil passage 227 is connected to the oil inlet 221, and the fourth oil passage 228 is connected to the oil return port 222; Valve body 23 is fixed inside the valve housing 22, and the valve body 23 is provided with an oil passage hole, which is connected to the corresponding oil passage. That is, the valve body 23 can be provided with four oil passage holes, which are respectively connected to the first oil passage 225, the second oil passage 226, the third oil passage 227 and the fourth oil passage 228.

[0044] When hydraulic oil needs to be added to the first cavity, the controller 3 controls the valve core 21 to rotate, so that the groove connects to the oil inlet 221 and the first cavity simultaneously through the corresponding oil passage and the oil passage hole, allowing hydraulic oil to enter the first cavity through the oil inlet 221. Simultaneously, the second cavity connects to the return oil port 222 through another groove on the valve core 21, allowing hydraulic oil in the second cavity to flow out through the return oil port 222. When hydraulic oil needs to be added to the second cavity, the controller 3 controls the valve core 21 to rotate, so that the groove connects to the oil inlet 221 and the second cavity simultaneously through the corresponding oil passage and the oil passage hole, allowing hydraulic oil to enter the second cavity through the oil inlet 221. Simultaneously, the first cavity connects to the return oil port 222 through another groove on the valve core 21, allowing hydraulic oil in the first cavity to flow out through the return oil port 222.

[0045] In this embodiment, the oil inlet 221 is connected to the first or second cavity by opening holes or grooves in the valve shell 22, valve body 23 and valve core 21 of the control valve 2 itself. This eliminates the need to add other pipelines or other separate structural components, which helps to reduce the overall volume of the hydraulic booster cylinder and reduce costs.

[0046] When the stall motor 4 is de-energized, the elastic rod 5 can automatically drive the valve core 21 to reset to a free state, that is, the elastic rod 5 is not under force. When the valve core 21 is in a free state, the pressure in the first oil passage 225 and the second oil passage 226 is the same, and the hydraulic oil flows out from the fourth oil passage 228, which is connected to the return port 222. When the valve core 21 rotates, the hydraulic oil flows to the first oil passage 225 or the second oil passage 226 in the direction of rotation, pushing the piston to move and do work. The amount of piston movement is controlled by the flow rate of the hydraulic oil.

[0047] Furthermore, the valve housing 22 may include a first housing and a second housing fixed to each other. The axes of the first housing and the second housing are collinear. The elastic rod 5 is disposed inside the first housing and is collinear with the axis of the first housing. The valve body 23 and the valve core 21 are installed inside the second housing and are collinear with the axis of the second housing. An end cap 24 may also be installed at one end of the second housing. In this embodiment, when the valve core 21 rotates, the valve body 23 is fixed to the second housing and there is no relative movement. The first oil passage 225, the second oil passage 226, the third oil passage 227, and the fourth oil passage 228 on the second housing are sealed by cooperating with the valve body 23 through the second housing; the first housing is also fixed to the second housing and there is no relative movement.

[0048] In some alternative embodiments, see Figure 4 As shown, the valve core 21 may be externally provided with a limiting groove 211. The hydraulic power cylinder also includes a limiting mechanism 25. The limiting mechanism 25 is at least partially located within the limiting groove 211, and there is a gap between the inner wall of the limiting groove 211 and the limiting mechanism 25. This gap can meet the rotation requirements of the valve core 21. The limiting mechanism 25 is used to limit the rotation angle of the valve core 21, which can protect the elastic rod 5 and prevent the valve core 21 from rotating excessively and causing hydraulic reversal. The limiting mechanism 25 determines the rotatable angle of the valve core 21. In this embodiment, the limiting mechanism 25 can preferably be fixed between the valve core 21 and the valve body 23.

[0049] Further, see Figure 1As shown, a displacement sensor 6 can also be installed on the cylinder 1. The displacement sensor 6 is used to detect the actual position of the piston and can convert the position of the piston into an electrical signal and transmit it to the controller 3. The controller 3 can also be used to correct the rotation angle of the valve core 21 based on the feedback of the actual position of the piston, so that the vehicle turns to the target angle.

[0050] Preferably, the controller 3 can also control the valve core 21 to rotate by a preset angle according to the target turning angle required by the vehicle and the axle load of the steering shaft, so that the oil inlet 221 of the control valve 2 is connected to the first cavity or the second cavity, and drive hydraulic oil from the oil inlet 221 into the cylinder 1 to push the piston to move a certain distance. In this embodiment, after obtaining the target turning angle required by the vehicle, the hydraulic power assist cylinder stroke corresponding to the target turning angle can be found from the turning angle and hydraulic power assist cylinder stroke table. At the same time, after obtaining the axle load of the steering shaft, the hydraulic oil pressure corresponding to the axle load can be found from the axle load and hydraulic pressure demand table. Then, according to the valve characteristic table (that is, the rotation angle of the valve core 21 corresponding to different pressures and different hydraulic cylinder strokes), the turning angle corresponding to the valve core 21 can be determined. That is, the valve core 21 can be rotated to that turning angle. By combining the target steering angle required by the vehicle with the axle load of the steering shaft, the required rotation angle of the valve core 21 can be obtained more accurately. After the valve core 21 rotates to this angle, the actual steering angle of the vehicle is closer to the target steering angle. If feedback adjustment is required later, the number of feedback adjustments can also be reduced.

[0051] Based on the above technical solution, when one end of the valve core 21 is fixed with an elastic rod 5 and the other end is connected to a stall motor 4, and the valve core 21 is driven to rotate by the stall motor 4, after finding and obtaining the rotation angle of the valve core 21, the current and torque table of the stall motor 4 can be consulted in conjunction with the stiffness of the elastic rod 5, and the magnitude of the corresponding current of the stall motor 4 can be obtained. By controlling the magnitude of the current of the stall motor 4 through the controller 3, the rotation angle of the valve core 21 can be controlled, and the actual stroke of the hydraulic booster cylinder after the valve core 21 rotates can also be obtained. If the actual stroke of the hydraulic booster cylinder does not meet the stroke requirements, the current of the stall motor 4 can be adjusted again until the stroke requirements are met.

[0052] This invention also provides a stroke control method for a hydraulic power-assisted cylinder. The cylinder body 1 of the hydraulic power-assisted cylinder is equipped with a piston, which divides the interior of the cylinder body 1 into a first chamber and a second chamber. The stroke control method provided in this invention can use any of the hydraulic power-assisted cylinders described in the above embodiments, and will not be elaborated further here. The stroke control method may include the following steps: controlling the valve core 21 of the control valve 2 to rotate by a preset angle according to the target turning angle required by the vehicle, so that the oil inlet 221 of the control valve 2 communicates with the first chamber or the second chamber, and driving hydraulic oil from the oil inlet 221 into the cylinder body 1 to push the piston to move a certain distance.

[0053] When the valve core 21 rotates to a certain angle in a certain direction, connecting the oil inlet 221 with the first chamber, hydraulic oil can enter the first chamber through the oil inlet 221 and drive the piston to move closer to the second chamber. When the valve core 21 rotates to a certain angle in a certain direction, connecting the oil inlet 221 with the second chamber, hydraulic oil can enter the second chamber through the oil inlet 221 and drive the piston to move closer to the first chamber. That is, after the valve core 21 rotates, hydraulic oil enters the cylinder 1 and drives the piston to move and do work within the cylinder 1. The amount of piston movement can be controlled by the flow rate of hydraulic oil, making the distance the piston moves quantitatively controllable, thus realizing the controllable stroke of the hydraulic power cylinder.

[0054] Furthermore, the stroke control method may also include: controlling the valve core 21 to rotate by a preset angle based on the target turning angle required by the vehicle and the axle load of the steering shaft, so that the oil inlet 221 of the control valve 2 is connected to the first chamber or the second chamber, and driving hydraulic oil from the oil inlet 221 into the cylinder 1 to push the piston to move a certain distance. That is, in this embodiment, not only is the target turning angle required by the vehicle obtained, but the turning angle of the valve core 21 is also determined by combining the axle load information of the steering shaft. By combining the target turning angle required by the vehicle with the axle load of the steering shaft, the angle that the valve core 21 needs to rotate can be obtained more accurately. After the valve core 21 rotates to this angle, the actual turning angle of the vehicle is closer to the target turning angle, and the number of feedback adjustments can be reduced if feedback adjustments are required in the future.

[0055] In some embodiments, one end of the valve core 21 can be connected to the stall motor 4, and the other end is fixed to the elastic rod 5. Controlling the rotation of the valve core 21 of the control valve 2 by a preset angle according to the target rotation angle required by the vehicle includes: controlling the current of the stall motor 4 according to the target rotation angle required by the vehicle, so that the stall motor 4 drives the valve core 21 to rotate by a preset angle. In this embodiment, after obtaining the target rotation angle required by the vehicle, the hydraulic power cylinder stroke corresponding to the target rotation angle can be found in the rotation angle and hydraulic power cylinder stroke table. Then, according to the valve characteristic table (i.e., the rotation angle of the valve core 21 corresponding to different hydraulic cylinder strokes), the rotation angle corresponding to the valve core 21 can be determined. After obtaining the rotation angle of the valve core 21, the current and torque table of the stall motor 4 can be consulted in conjunction with the stiffness of the elastic rod 5 to obtain the magnitude of the corresponding stall motor 4 current. By controlling the magnitude of the stall motor 4 current, the rotation angle of the valve core 21 can be controlled, the hydraulic oil flow rate can be controlled, and the hydraulic power cylinder stroke can be made controllable.

[0056] Preferably, the actual stroke of the hydraulic booster cylinder after the valve core 21 rotates can be detected, and the rotation angle of the valve core 21 can be corrected according to the actual position of the piston so that the vehicle turns to the target angle. If the actual stroke of the hydraulic booster cylinder does not meet the stroke requirement (i.e. the vehicle has not yet reached the target angle), the current of the stall motor 4 can be adjusted again until the stroke requirement is met.

[0057] This invention also provides a vehicle, which may include a frame and a hydraulic power-assisted cylinder provided in any of the above embodiments mounted on the frame.

[0058] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0059] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0060] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the 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 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 claimed herein.

Claims

1. A hydraulic power-assisted cylinder, characterized in that, It includes: A cylinder (1) is provided inside the cylinder (1), and the piston divides the interior of the cylinder (1) into a first cavity and a second cavity; The control valve (2) has a valve core (21) and an oil inlet (221). and controller (3), the controller (3) is used to control the valve core (21) to rotate at a preset angle according to the target turning angle required by the vehicle, so that the oil inlet (221) is connected to the first cavity or the second cavity; The controller (3) is also used to control the flow rate of hydraulic oil from the oil inlet (221) into the first cavity or the second cavity; A stall motor (4) is installed on the cylinder body (1), and the stall motor (4) is signal-connected to the controller (3); the control valve (2) includes an elastic rod (5) fixed to the cylinder body (1), one end of the valve core (21) is fixed to the elastic rod (5), and the other end is connected to the stall motor (4); the controller (3) controls the rotation angle of the valve core (21) by controlling the current of the stall motor (4); The cylinder (1) is also provided with a displacement sensor (6), which is used to detect the actual position of the piston and convert the position of the piston into an electrical signal and transmit it to the controller (3). The controller (3) is also used to correct the rotation angle of the valve core (21) based on the actual position feedback of the piston, so that the vehicle's turning angle reaches the target turning angle.

2. The hydraulic power-assisted cylinder as described in claim 1, characterized in that, The valve core (21) has a groove on its outside, and the control valve (2) further includes: The valve housing (22) is provided with the oil inlet (221), and the valve housing (22) is provided with multiple oil passages; Valve body (23), the valve body (23) is fixed inside the valve housing (22), the valve body (23) is provided with an oil passage, the oil passage is connected to the corresponding oil passage; The controller (3) is used to control the rotation of the valve core (21), so that the groove is simultaneously connected to the oil inlet (221) and the first cavity through the corresponding oil passage and the oil passage hole; or so that the groove is simultaneously connected to the oil inlet (221) and the second cavity through the corresponding oil passage and the oil passage hole.

3. The hydraulic power-assisted cylinder as described in claim 1, characterized in that: The valve core (21) is provided with a limiting groove (211) on the outside. The hydraulic booster cylinder also includes a limiting mechanism (25). The limiting mechanism (25) is at least partially located in the limiting groove (211), and there is a gap between the inner wall of the limiting groove (211) and the limiting mechanism (25). The limiting mechanism (25) is used to limit the rotation angle of the valve core (21).

4. A stroke control method for a hydraulic power cylinder as described in claim 1, wherein, The hydraulic power cylinder has a piston inside its cylinder body (1), which divides the interior of the cylinder body (1) into a first chamber and a second chamber. The stroke control method includes the following steps: According to the target turning angle required by the vehicle, the valve core (21) of the control valve (2) is rotated by a preset angle, so that the oil inlet (221) of the control valve (2) is connected to the first cavity or the second cavity, and the hydraulic oil is driven from the oil inlet (221) into the cylinder (1) to push the piston to move a distance.

5. The stroke control method as described in claim 4, characterized in that, The stroke control method further includes: According to the target turning angle required by the vehicle and the axle load of the steering shaft, the valve core (21) is controlled to rotate at a preset angle, so that the oil inlet (221) of the control valve (2) is connected to the first cavity or the second cavity, and the hydraulic oil is driven from the oil inlet (221) into the cylinder (1) to push the piston to move a distance.

6. The stroke control method as described in claim 4, characterized in that, One end of the valve core (21) is connected to the stall motor (4), and the other end is fixed to the elastic rod (5); the valve core (21) of the control valve (2) rotates by a preset angle according to the target turning angle required by the vehicle, including: The current of the stall motor (4) is controlled according to the target turning angle required by the vehicle, so that the stall motor (4) drives the valve core (21) to rotate by a preset angle.

7. The stroke control method as described in claim 4, characterized in that, The stroke control method further includes: The actual position of the piston is detected, and the rotation angle of the valve core (21) is corrected based on the feedback of the actual position of the piston, so that the turning angle of the vehicle reaches the target turning angle.

8. A vehicle, characterized in that, The vehicle includes a frame and a hydraulic power cylinder as described in any one of claims 1-3 mounted on the frame.

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