CN218489737U

CN218489737U - Steer-by-wire system and vehicle

Info

Publication number: CN218489737U
Application number: CN202223003596.XU
Authority: CN
Inventors: 蒋微
Original assignee: Hozon New Energy Automobile Co Ltd
Current assignee: Hozon New Energy Automobile Co Ltd
Priority date: 2022-11-10
Filing date: 2022-11-10
Publication date: 2023-02-17
Anticipated expiration: 2032-11-10

Abstract

The application discloses a line control steering system and a vehicle, wherein the line control steering system comprises a steering wheel, a torsion bar assembly, a piston cylinder, a piston, a steering cylinder, a first pipeline, a second pipeline and an electromagnetic valve; the torsion bar component is connected with a steering wheel; the piston cylinder is sleeved at one end of the torsion bar component far away from the steering wheel; the piston is movably sleeved in the piston cylinder to divide the piston cylinder into an upper cavity and a lower cavity by the torsion bar component, and the piston can reciprocate in the piston cylinder along the axial direction of the torsion bar component along with the rotation of the torsion bar component; a steering rod and a hydraulic cavity are arranged in the steering cylinder, and the steering rod in the hydraulic cavity divides the hydraulic cavity into a first hydraulic cavity and a second hydraulic cavity along the axial direction of the steering rod; two ends of the first pipeline are respectively communicated with the upper cavity and the first hydraulic cavity; two ends of the second pipeline are respectively communicated with the lower cavity and the second hydraulic cavity, and the second pipeline is communicated with the first pipeline; the electromagnetic valve is arranged at the communication position of the first pipeline and the second pipeline and used for conducting or cutting off the communication position of the first pipeline and the second pipeline.

Description

Steer-by-wire system and vehicle

Technical Field

The application relates to the technical field of vehicle control, in particular to a wire-controlled steering system and a vehicle.

Background

Due to the obvious advantages of rapid response of electronic sensors and actuators, multi-dimensional dynamic complex control and the like, the popularization of whole vehicle part electrification has become a necessary trend. As a typical example, a steering system is purely mechanically unpowered from the beginning, and becomes a purely electronic power-assisted steering system which is widely popularized at present, even commercial trucks are switched from the traditional oil-electric hybrid power-assisted steering system to the purely electronic power-assisted steering system to provide the driver with the overall transverse steering, especially the steer-by-wire system is grown up, and the mechanical connection structure between a steering wheel and a steering gear is removed to transmit the steering intention of the driver to the steering gear only through the transmission of an electric signal.

In order to ensure driving safety and avoid the out-of-control steering of a vehicle under the condition of extreme failure, some designers add a steering column and a clutch in a linear control steering system to meet the fault-tolerant requirement under the condition of extreme failure, namely the clutch of the steering system is switched from a disengaged state to a closed state under the normal and failure states, so that the steering wheel and the steering gear are mechanically connected again, and the manual control steering can be carried out under the condition of extreme failure.

However, since the space in the vehicle is limited, the arrangement of the steering column and the clutch is inevitably limited, and the original installation convenience of the steer-by-wire system is also sacrificed.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a steer-by-wire system, which aims to solve the problems that the space is limited and the original system installation convenience is sacrificed due to fault tolerance by using a steering column and a clutch in the conventional steer-by-wire system.

In order to solve the above technical problem, an embodiment of the present application provides the following technical solutions:

a first aspect of the present application provides a steer-by-wire system comprising

A steering wheel;

a torsion bar assembly connected to the steering wheel;

a piston cylinder sleeved at one end of the torsion bar assembly far away from the steering wheel and used for containing hydraulic fluid;

the piston is movably sleeved in the piston cylinder and connected with the torsion bar assembly in a sleeved mode so as to divide the piston cylinder into a first cavity and a second cavity, and the piston can reciprocate in the piston cylinder along the axial direction of the torsion bar assembly along with the rotation of the torsion bar assembly;

the steering device comprises a steering cylinder, a steering rod and a control device, wherein the steering cylinder is internally provided with the steering rod, and two ends of the steering rod extend out of the steering cylinder and are used for being connected with a tire; a hydraulic cavity is arranged in the steering cylinder, and the steering rod in the hydraulic cavity divides the hydraulic cavity into a first hydraulic cavity and a second hydraulic cavity along the axial direction of the steering rod;

the two ends of the first pipeline are respectively communicated with the upper cavity and the first hydraulic cavity;

the two ends of the second pipeline are respectively communicated with the lower cavity and the second hydraulic cavity, and the second pipeline is communicated with the first pipeline;

the electromagnetic valve is arranged at the communication part of the first pipeline and the second pipeline and used for conducting or cutting off the communication part of the first pipeline and the second pipeline;

the cross section of the piston perpendicular to the axial direction of the piston is non-circular, and the inner wall of the piston cylinder is attached to the outer wall of the piston.

In some modified embodiments of the first aspect of the present application, the steer-by-wire system described above, wherein the solenoid valve is a normally closed solenoid valve;

when the wire control part of the wire control steering system is abnormal, the electromagnetic valve is closed to divide the piston cylinder into the upper cavity and the lower cavity which are not communicated with each other.

In some modified embodiments of the first aspect of the present application, the steering-by-wire system is characterized in that two seals are disposed at intervals along an axial direction of the steering tube, and the seals are sleeved outside the steering rod to form the hydraulic pressure chamber between the two seals.

In some modified embodiments of the first aspect of the present application, the steer-by-wire system is further provided, wherein a blade is provided on the steering rod located in the hydraulic chamber, and the blade is provided around an axial direction of the steering rod for a circle, so as to form the first hydraulic chamber and the second hydraulic chamber on both sides of the blade in the axial direction of the steering rod.

In some modified embodiments of the first aspect of the present application, the steer-by-wire system described above, wherein the blade abuts against an inner wall of the steering cylinder.

In some modified embodiments of the first aspect of the present application, the steer-by-wire system described above, wherein at least a portion of the torsion bar assembly located within the piston cylinder is a threaded rod;

the inner wall of the piston is in rolling fit with the screw through a ball.

In some modified embodiments of the first aspect of the present application, the steer-by-wire system described above, further comprising a controller assembly and a steering drive assembly;

the steering driving assembly is movably connected with the steering rod so as to drive the steering rod to reciprocate along the axial direction of the steering rod;

the torsion bar assembly comprises a torsion bar and a torque sensor; the torsion bar is connected with the steering wheel, and the torque sensor is connected with the torsion bar;

the controller assembly is in signal connection with the torque sensor so as to calculate the steering angle of the steering rod according to the torque of the torsion bar and control the steering angle of the steering rod through the steering driving assembly.

In some modified embodiments of the first aspect of the present application, the steer-by-wire system set forth above, wherein the torsion bar assembly further comprises a first worm gear and a first worm;

the first turbine is sleeved at one end, away from the steering wheel, of the torsion bar;

the first worm is connected with the controller assembly and meshed with the first turbine;

the controller assembly can generate a simulated road load according to the driving data of the steering driving assembly and transmit the simulated road load to the steering wheel through the torsion bar assembly.

In some modified embodiments of the first aspect of the present application, the steer-by-wire system is as previously described, wherein the steer drive assembly comprises a motor assembly, a second worm gear, and a steering gear;

the motor assembly is in signal connection with the controller assembly and is meshed with the second worm wheel through the second worm;

the second turbine is meshed with the steering rod through the steering gear;

wherein the drive data includes at least phase currents of the motor assembly.

A second aspect of the present application provides a vehicle comprising the steer-by-wire system described above.

Compared with the prior art, the steer-by-wire system provided by the first aspect of the application has the advantages that the upper cavity and the lower cavity are arranged on the side of the steering wheel, the first hydraulic cavity and the second hydraulic cavity are arranged on the side of the steering barrel, and when the steer-by-wire part is normal, the electromagnetic valve conducts the upper cavity and the lower cavity, so that the steering wheel drives the piston to flow in the piston barrel in the movement process, and a steering rod in the first hydraulic cavity or the second hydraulic cavity cannot be pushed; when the wire control part is in extreme failure, the electromagnetic valve is closed, the upper cavity and the lower cavity are isolated, the upper cavity and the lower cavity are not communicated when the steering wheel drives the piston in the moving process, and hydraulic fluid is pressed into the first hydraulic cavity or the second hydraulic cavity to push the steering rod to move transversely, so that manual control steering can be performed under the condition of extreme failure of wire control, and the driving safety is effectively guaranteed. The problem of the space that utilizes steering column and clutch to carry out fault-tolerant and bring among the existing steer-by-wire system is limited, has sacrificed original system installation convenience is effectively solved.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present application will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present application are illustrated by way of example and not by way of limitation in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:

fig. 1 schematically illustrates a structural schematic diagram of a steer-by-wire system provided in an embodiment of the present application;

fig. 2 is a block diagram schematically illustrating a structure of a steer-by-wire system provided in an embodiment of the present application;

the reference numbers illustrate: the steering wheel comprises a steering wheel 1, a torsion bar component 2, a torsion bar 21, a column 22, a torque sensor 23, a first worm wheel 24, a first worm 25, a piston cylinder 3, an upper cavity 31, a lower cavity 32, a piston 4, balls 41, an electromagnetic valve 5, a steering cylinder 6, a steering rod 61, blades 611, a hydraulic cavity 62, a first hydraulic cavity 621, a second hydraulic cavity 622, a sealing member 63, a first pipeline 7, a second pipeline 8, tires 9, a controller assembly 10, a steering driving assembly 11, a motor assembly 111, a second worm wheel 112, a second worm wheel 113 and a steering gear 114.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which this application belongs.

In order to solve the technical problems, the general idea of the embodiment of the application is as follows:

example 1

Referring to fig. 1, a steer-by-wire system provided in an embodiment of the present application includes a steering wheel 1, a torsion bar assembly 2, a piston cylinder 3, a piston 4, a solenoid valve 5, a steering cylinder 6, a first pipeline 7, and a second pipeline 8; the torsion bar component 2 is connected with the steering wheel 1; the piston cylinder 3 is sleeved at one end of the torsion bar assembly 2 away from the steering wheel 1 and used for containing hydraulic fluid; the piston 4 is movably sleeved in the piston cylinder 3 and connected to the torsion bar assembly 2 so as to divide the piston cylinder 3 into an upper cavity 31 and a lower cavity 32, and the piston 4 can reciprocate in the piston cylinder 3 along the axial direction of the torsion bar assembly 2 along with the rotation of the torsion bar assembly 2; a steering rod 61 is arranged in the steering cylinder 6, and two ends of the steering rod 61 extend out of the steering cylinder 6 and are used for being connected with tires 9; a hydraulic cavity 62 is formed in the steering cylinder 6, and the steering rod 61 located in the hydraulic cavity 62 divides the hydraulic cavity 62 into a first hydraulic cavity 621 and a second hydraulic cavity 622 along the axial direction of the steering rod 61; two ends of the first pipeline 7 are respectively communicated with the upper cavity 31 and the first hydraulic cavity 621; two ends of the second pipeline 8 are respectively communicated with the lower cavity 32 and the second hydraulic cavity 622, and the second pipeline 8 is communicated with the first pipeline 7; the electromagnetic valve 5 is arranged at the communication position of the first pipeline 7 and the second pipeline 8 and is used for conducting or cutting off the communication position of the first pipeline 7 and the second pipeline 8.

Specifically, in order to solve the problem that the space is limited and the original system installation convenience is sacrificed due to the fact that the existing steer-by-wire system utilizes a steering column and a clutch to perform fault tolerance, the steer-by-wire system provided by this embodiment maintains the original steer-by-wire control structure and control program, additionally an upper cavity 31 and a second cavity 32 which contain hydraulic fluid are arranged on the side of the steering wheel 1, a first hydraulic cavity 621 and a second hydraulic cavity 622 are arranged on the side of the steering cylinder 6, the upper cavity 31 and the first hydraulic cavity 621, the second cavity 32 and the second hydraulic cavity 622 are respectively communicated through a first pipeline 7 and a second pipeline 8, the first pipeline 7 and the second pipeline 8 are communicated, and an electromagnetic valve 5 is arranged at the communication position, so that when the signal control of the steer-by-wire part is normal, the electromagnetic valve 5 conducts the two pipelines, the hydraulic fluid in the piston cylinder 3 can flow back and forth between the upper cavity 31 and the lower cavity 32, and cannot enter the first hydraulic cavity 621 or the second hydraulic cavity 622 downwards to impact the steering rod 61; when the drive-by-wire part is abnormal or extremely invalid, the electromagnetic valve 5 cuts off the communication of the two pipelines, the upper cavity 31 is communicated with the first hydraulic cavity 621 in a one-way mode, the lower cavity 32 is communicated with the second hydraulic cavity 622 in a one-way mode, the piston 4 is driven to move up and down along with the rotation of the steering wheel 1, so that hydraulic fluid is extruded into the first hydraulic cavity 621 or the second hydraulic cavity 622, the steering rod 61 is driven to move transversely, manual control steering is achieved, the steering column and the clutch which are rigid and occupy large installation space can be replaced by the flexible and flexibly-installed pipelines in the drive-by-wire steering system, space limitation is avoided, meanwhile, the installation convenience of the drive-by-wire steering system can be effectively guaranteed, the installation positions of other parts cannot be influenced by too much space, and meanwhile, the collision safety of a vehicle can be improved through the flexible structure of the pipelines.

The steer-by-wire control system provided by the embodiment also comprises an electric signal control part structure and a program, for example: referring to fig. 2, the controller assembly 10 and the steering driving assembly 11, the controller assembly 10 can obtain the torque of the steering wheel 1 and control the lateral movement of the steering rod 61, i.e. the steering of the vehicle, according to the torque through the steering driving assembly 11, and the controller assembly 10 can also generate a simulated road load according to the driving data of the steering driving assembly 11 and transmit the simulated road load to the steering wheel 1, so that the driver can accurately grasp the road feel; the above features can be easily understood by those skilled in the art, and will not be described herein in too much detail. Meanwhile, in the embodiment provided by the present invention, when the signal control of the wire control part is normal, the solenoid valve 5 conducts the two pipelines, so that the hydraulic fluid in the piston cylinder 3 can flow back and forth between the upper cavity 31 and the lower cavity 32, and cannot enter the first hydraulic cavity 621 or the second hydraulic cavity 622 downward to impact the steering rod 61, and the transverse movement of the lower steering rod 61 cannot drive the rotation of the upper torsion bar assembly 2 and the steering wheel 1.

The torsion bar assembly 2 is a rod-shaped structure and is fixedly connected with the steering wheel 1 on the upper side of the vehicle body so as to be capable of transmitting the torque of the steering wheel 1 downwards to the piston 3 and the controller assembly 10; in the present embodiment, the torsion bar assembly 2 may include a torsion bar 21 with a designated elasticity and a rigid column 22, one end of the torsion bar is fixedly connected to the steering wheel 1, and the other end of the torsion bar is fixedly connected to the column, so that the controller assembly 10 can calculate the torque of the steering wheel 1 through the angular difference between the torsion bar 21 and the column 22 and convert the calculated torque into the rotation angle of the steering rod 61 to be transmitted to the steering driving assembly 11.

The piston cylinder 3 is a rigid cylinder, the specific shape of which is not limited herein, and can be a cylinder or the like; the piston 4 is of a rigid structure, the piston 4 and the piston cylinder 3 are coaxially arranged, the side wall of the piston 4 extending along the axial direction is attached to the inner wall of the piston cylinder 3, an upper cavity 31 and a lower cavity 32 are formed above and below the piston 4 respectively, and hydraulic fluid is contained in the upper cavity 31 and the lower cavity 32; the piston 4 is threadedly engaged with the column 22 so that the piston 4 can reciprocate in the piston cylinder 3 in the axial direction of the column 22 when the torque of the steering wheel 1 is transmitted to the column 22.

The steering cylinder 6 and the steering rod 61 are arranged on the lower side of the vehicle body corresponding to the tire 9, the steering cylinder 6 and the steering rod 61 are rigid structures, and the steering rod 61 is coaxial with the steering cylinder 6 and penetrates out of the steering cylinder 6 for connecting the tire 9, so that the steering rod 61 transversely moves under the control of the steering driving assembly 11 to realize the steering of the tire 9, namely the vehicle body. The inner part of the steering cylinder 6 is partitioned into hydraulic chambers 62 for receiving hydraulic fluid, for example, by a partition or a sealing plate; the steering rod 61 in the hydraulic chamber 62 divides the hydraulic chamber 62 into a first hydraulic chamber 621 and a second hydraulic chamber 622 that are not communicated with each other, and a partition plate or a sealing plate may be disposed on an outer wall of the steering rod 61, so that the steering rod 61 can move laterally toward the second hydraulic chamber 622 when the hydraulic fluid impacts the first hydraulic chamber 621, and conversely, the steering rod 61 can move laterally toward the first hydraulic chamber 621 when the hydraulic fluid impacts the second hydraulic chamber 622.

Wherein the first and second tubular bodies 7, 8 are flexible tubular bodies having oil-resistant, corrosion-resistant properties to be able to contain hydraulic fluid, such as: and (5) hydraulic oil. The communication part of the first tube 7 and the second tube 8 can be arranged on the outer wall of the piston cylinder 3 as shown in fig. 1, so as to avoid occupying too much space, the electromagnetic valve 5 is arranged in the communication part, when the electromagnetic valve 5 is switched on, the first tube 7 is communicated with the second tube 8, and at this time, the upper cavity 31 is communicated with the lower cavity 32; correspondingly, when the electromagnetic valve 5 is closed, the first pipe body 7 and the second pipe body 8 are not communicated with each other, and the upper cavity body 31 and the lower cavity body 32 are also not communicated with each other; it can be further understood that: when the electric signal transmission part of the steer-by-wire system is abnormal, that is, when the signal connection between the controller assembly 10 and the electromagnetic valve 5 or the power supply relation is abnormal, the electromagnetic valve 5 can keep the conduction between the first pipe 7 and the second pipe 8, at this time, hydraulic fluid can flow between the upper cavity 31 and the lower cavity 32 when the piston 4 moves, and the hydraulic fluid does not impact the first hydraulic cavity 621 or the second hydraulic cavity 622; on the contrary, when the signal transmission part of the steer-by-wire system is abnormal or extremely failed, that is, when the signal connection or power supply relationship between the controller assembly 10 and the electromagnetic valve 5 is disconnected, the electromagnetic valve 5 cuts off the conduction between the first tube 7 and the second tube 8, at this time, the upper cavity 31 and the lower cavity 32 are moved by the piston 4, hydraulic fluid cannot flow, and the hydraulic fluid enters the first hydraulic cavity 621 or the second hydraulic cavity 622 to impact the steering rod 61, so that the steering rod 61 is transversely moved, that is, the steering under manual control is realized. Of course, the communication ports of the first tube 7 and the upper cavity 31 and the communication ports of the second tube 8 and the lower cavity 32 are preferably located on the same side of the piston cylinder 3 to avoid winding during tube extension.

The electromagnetic valve 5 is a valve body capable of realizing on-off control through an electric signal, preferably, a normally closed electromagnetic valve is adopted in the embodiment, the normally closed electromagnetic valve is electrically connected with the controller assembly 10, power supply of the controller assembly 10 is received, and when the controller assembly 10 is normally powered, the electromagnetic valve 5 keeps a conducting state; correspondingly, when the controller assembly 10 is abnormal or extremely invalid, the low-voltage power supply of the whole vehicle is lost, the power supply of the electromagnetic valve 5 cannot be supplied, the electromagnetic valve 5 automatically becomes a closed state, the reaction rate is further greatly improved, and the electromagnetic valve 5 can be automatically closed at the same time of the abnormal or extremely invalid, so that additional control is not needed.

According to the above list, in the steer-by-wire system provided by the first aspect of the present application, the upper cavity 31 and the lower cavity 32 are disposed on the side of the steering wheel 1, the first hydraulic cavity 621 and the second hydraulic cavity 622 are disposed on the side of the steering cylinder 6, and when the steer-by-wire portion is normal, the electromagnetic valve 5 conducts the upper cavity 31 and the lower cavity 32, so that the steering wheel 1 drives the piston 4 to flow in the piston cylinder 3 during the movement process of the piston 4, and the steering rod 61 in the first hydraulic cavity 621 or the second hydraulic cavity 622 cannot be pushed; when the wire control part is in extreme failure, the electromagnetic valve 5 is closed to isolate the upper cavity 31 from the lower cavity 32, so that when the steering wheel 1 drives the piston 4 to move, the upper cavity 31 is not communicated with the lower cavity 32, and hydraulic fluid is pressed into the first hydraulic cavity 621 or the second hydraulic cavity 622 to push the steering rod 61 to move transversely, thereby realizing manual control steering under the condition of extreme failure of the wire control, and effectively ensuring the driving safety. The problems that the space is limited and the original system installation convenience is sacrificed due to the fact that the steering column and the clutch are utilized for fault tolerance in the existing steer-by-wire system are effectively solved.

The term "and/or" herein is merely an associative relationship describing an associated object, meaning that three relationships may exist, e.g., a and/or B, specifically understood as: both a and B may be included, a may be present alone, or B may be present alone, and any of the three cases can be provided.

Further, in the steer-by-wire system provided by the present embodiment, in a specific implementation, a cross-sectional shape of the piston 4 perpendicular to an axial direction thereof is non-circular, and an inner wall of the piston cylinder 3 is attached to an outer wall of the piston 4.

Specifically, in order to ensure driving safety, in the present embodiment, the up-and-down movement of the piston 4 is limited to be achieved only by the rotation of the steering wheel 1, and the cross-sectional shape of the piston 4 in the direction perpendicular to the axial direction thereof is set to be non-circular, for example: the piston 4 has a limiting relation of edges with the inner wall of the piston cylinder 3 in the axial direction around the piston, and cannot naturally rotate and move downwards under the action of gravity, so that the driving safety is effectively ensured.

Further, referring to fig. 1, in the steer-by-wire system provided in this embodiment, in a specific implementation, two sealing members 63 are disposed at intervals along an axial direction of the steering tube 6, and the sealing members 63 are sleeved outside the steering rod 61, so as to form the hydraulic chamber 62 between the two sealing members 63.

Specifically, in order to realize the arrangement of the hydraulic cavity 62 in the steering cylinder 6, two sealing members 63 are arranged in the steering cylinder 6 at intervals along the axial direction of the steering cylinder in the embodiment, the sealing members 63 may be sealing rubber sleeves or sealing rubber coated outside a partition plate, the inner wall of the steering cylinder is sleeved on the steering rod 61, the outer wall of the steering cylinder is abutted against the inner wall of the steering cylinder 6, and thus a space is formed by enclosing the inside of the steering cylinder 6 between the two sealing members 63 in a matching manner, namely the hydraulic cavity 62 is formed. The setting position and size of the hydraulic chamber 62 are not particularly limited, and may be designed and adjusted according to actual needs.

Further, referring to fig. 1, in the steer-by-wire system provided in this embodiment, in a specific implementation, a vane 611 is disposed on the steering rod 61 located in the hydraulic chamber 62, and the vane 611 is disposed around the axial direction of the steering rod 61, so as to form the first hydraulic chamber 621 and the second hydraulic chamber 622 on two sides of the vane 611 along the axial direction of the steering rod 61.

Specifically, in order to realize that the steering rod 61 can divide the hydraulic chamber 62 into a first hydraulic chamber 621 and a second hydraulic chamber 622, in this embodiment, a blade 611 is disposed on an outer wall of the guide rod 61, and the blade 611 is a rigid structure, and may be disposed integrally with the blade 611 or may be additionally connected to the blade 611. The vane 611 is disposed around the steering rod 61 in the axial direction, and one end of the vane 611 away from the steering rod 61 abuts against the inner wall of the steering cylinder 6, so that a first hydraulic chamber 621 and a second hydraulic chamber 622 which are independent of each other are formed.

Further, referring to fig. 1, the present embodiment provides a steer-by-wire system, in a specific implementation, at least a portion of the torsion bar assembly 2 located inside the piston cylinder 3 is a screw rod; the inner wall of the piston 4 is in rolling engagement with the screw via balls 41.

Specifically, in order to achieve that the piston 4 can reciprocate along the axial direction of the torsion bar assembly 2 along with the rotation of the steering wheel 1, in the embodiment, at least the portion of the torsion bar assembly 2 located in the piston cylinder 3 is provided as a screw, that is, the column 22 is in the form of a screw, and in order to reduce the friction with the column 22 during the movement of the piston 4 and improve the system compliance, the ball 41 is provided, and the threaded connection between the piston 4 and the column 22 is achieved through the ball 41, so as to form a ball screw matching structure.

Further, referring to fig. 1 and fig. 2, the steer-by-wire system provided in this embodiment further includes, in a specific implementation, a controller assembly 10 and a steering driving assembly 11; the steering driving assembly 11 is movably connected with the steering rod 61 so as to drive the steering rod 61 to reciprocate along the axial direction of the steering rod; the torsion bar assembly 2 comprises a torsion bar 21 and a torque sensor 23; the torsion bar 21 is connected with the steering wheel 1, and the torque sensor 23 is connected with the torsion bar 21; the controller assembly 10 is in signal connection with the torque sensor 23 to calculate and control the steering angle of the steering rod 61 through the steering driving assembly 11 according to the torque of the torsion bar 21.

Specifically, the controller assembly 10 at least includes a power motor (not shown in the figure) and a controller (not shown in the figure), wherein the controller is used for storing and executing a steer-by-wire program, and can calculate the angle of the steering wheel 1 to control the rotation of the vehicle body according to the detection data of the torque sensor 23 and transmit the angle to the steering power motor; the power motor is in signal connection with the controller to provide driving power for the torsion bar assembly 2 to be transmitted to the steering wheel 1 according to the control of the controller; the steering power assembly 11 at least comprises a steering power motor and a transmission component, wherein the steering power motor is in signal connection with the controller so as to drive the steering rod 61 transversely through the transmission component according to the control of the controller. Specifically, the steer-by-wire program stored and executed in the controller is easily understood and obtained by those skilled in the art, and will not be described in detail herein.

Further, referring to fig. 1 and fig. 2, the steer-by-wire system provided by the present embodiment further includes, in a specific implementation, the torsion bar assembly 2 further includes a first worm gear 24 and a first worm 25; the first turbine 24 is sleeved at one end of the torsion bar 21 departing from the steering wheel 1; the first worm 25 is connected with the controller assembly 10, and the first worm 25 is meshed with the first worm wheel 24; wherein, the controller assembly 10 can generate a simulated road load according to the driving data of the steering driving assembly 11 and transmit the simulated road load to the steering wheel 1 through the torsion bar component 2.

Specifically, in order to achieve real road feel feedback during steer-by-wire control, in this embodiment, a transmission structure in which the first worm wheel 24 and the first worm 25 are engaged is further disposed at one end of the torsion bar 21 away from the steering wheel 1, so that when the controller assembly 10 can generate a simulated road load according to the driving data of the steering drive assembly 11, the simulated road load can be transmitted to the steering wheel 1 through the transmission component in which the first worm wheel 24 and the first worm 25 are engaged and the torsion bar 21, so that a driver can accurately grasp road information; the above related contents of the road feedback are programs that can be easily understood and obtained by those skilled in the art, and will not be described herein.

Further, referring to fig. 1 and fig. 2, the steer-by-wire system provided in the present embodiment, in a specific implementation, the steer-driving assembly 11 includes a motor assembly 111, a second worm 112, a second worm wheel 113, and a steering gear 114; the motor assembly 111 is in signal connection with the controller assembly 10, and the motor assembly 111 is meshed with the second worm wheel 113 through the second worm 112; the second turbine 113 is meshed with the steering rod 61 through the steering gear 114; wherein the driving data at least includes phase current of the motor assembly 111 in the current vehicle driving state.

Specifically, in order to realize that the controller assembly 10 completes the steering of the vehicle through the signal, in the present embodiment, the steering driving assembly 11 is configured to include a motor assembly 111, a second worm 112, a second worm wheel 113, and a steering gear 114; the motor assembly 111 is used for providing a driving force, and the second worm 112, the second worm wheel 113 and the steering gear 114 form a transmission component of the motor assembly 111 for the driving force of the steering rod 61, and the above-mentioned arrangement can be easily understood by those skilled in the art, and will not be described in detail herein.

Example 2

The present embodiment provides a vehicle including the steer-by-wire system described above.

Specifically, the steer-by-wire system is the steer-by-wire system described in embodiment 1, and for the specific structure and the working principle, reference is made to the detailed description of embodiment 1, which is not described herein in detail.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A steer-by-wire system, comprising:

a steering wheel;

a torsion bar assembly connected to the steering wheel;

the piston cylinder is sleeved at one end, far away from the steering wheel, of the torsion bar assembly and is used for containing hydraulic fluid;

the piston is movably sleeved in the piston cylinder and connected with the torsion bar assembly in a sleeved mode so as to divide the piston cylinder into an upper cavity and a lower cavity, and the piston can reciprocate in the piston cylinder along the axial direction of the torsion bar assembly along with the rotation of the torsion bar assembly;

the steering cylinder is internally provided with a steering rod, and two ends of the steering rod extend out of the steering cylinder and are used for being connected with a tire; a hydraulic cavity is arranged in the steering cylinder, and the steering rod in the hydraulic cavity divides the hydraulic cavity into a first hydraulic cavity and a second hydraulic cavity along the axial direction of the steering rod;

and the electromagnetic valve is arranged at the communication position of the first pipeline and the second pipeline and used for switching on or switching off the communication position of the first pipeline and the second pipeline.

2. The steer-by-wire system of claim 1, wherein:

the electromagnetic valve is a normally closed electromagnetic valve;

when the wire control part of the wire control steering system is abnormal, the electromagnetic valve is closed to divide the piston cylinder into the upper cavity and the lower cavity which are not communicated with each other;

3. The steer-by-wire system of claim 1, wherein:

two sealing pieces are arranged in the steering cylinder at intervals along the axial direction of the steering cylinder, and the sealing pieces are sleeved outside the steering rod so as to form the hydraulic cavity between the two sealing pieces.

4. The steer-by-wire system according to claim 1 or 3, wherein:

and blades are arranged on the steering rod in the hydraulic cavity, and the blades are arranged around the axial direction of the steering rod for a circle so as to form the first hydraulic cavity and the second hydraulic cavity on two sides of the blades along the axial direction of the steering rod.

5. The steer-by-wire system of claim 4, wherein:

the blades are abutted against the inner wall of the steering cylinder.

6. The steer-by-wire system of claim 1, wherein:

the torsion bar assembly is at least positioned in the piston cylinder and is provided with a screw;

the inner wall of the piston is in rolling fit with the screw through a ball.

7. The steer-by-wire system of claim 1, wherein:

the steering system also comprises a controller assembly and a steering driving assembly;

8. The steer-by-wire system of claim 7, wherein:

the torsion bar assembly further comprises a first worm gear and a first worm;

wherein the controller assembly is capable of generating a simulated road load based on the drive data of the steering drive assembly and transmitting the simulated road load to the steering wheel through the torsion bar assembly.

9. The steer-by-wire system of claim 8, wherein:

the steering driving assembly comprises a motor assembly, a second worm, a second turbine and a steering gear;

the motor assembly is in signal connection with the controller assembly and is meshed with the second turbine through the second worm;

the second turbine is meshed with the steering rod through the steering gear;

wherein the drive data includes at least phase currents of the motor assembly.

10. A vehicle, characterized in that it comprises:

the steer-by-wire system of any one of claims 1-9.