CN218489737U - Steer-by-wire system and vehicle - Google Patents

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

Steering by wire system and vehicle

technical field

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

Background technique

Due to the remarkable advantages of fast response of electronic sensors and actuators and multi-dimensional dynamic and complex control, the popularization of electrification of vehicle parts has become an inevitable trend. As a typical example, the steering system has changed from a purely mechanical power-assisted steering system to a purely electronic power-assisted steering system that has become popular on a large scale. Even commercial trucks are switching from traditional gasoline-electric hybrid power to pure electronic power. The form of the steering system provides the driver with lateral control of the vehicle, especially the rise of the steer-by-wire system, which removes the mechanical connection between the steering wheel and the steering gear and only transmits the driver's steering intention to the steering wheel through the transmission of electrical signals. device.

In order to ensure driving safety and avoid vehicle steering loss of control under extreme failure conditions, some designers add steering columns and clutches to the steering-by-wire steering system to meet the fault tolerance requirements under extreme failure conditions, that is, the steering system is in normal and failure states. The lower clutch is switched from the disengaged state to the closed state, so that the mechanical connection between the steering wheel and the steering gear is formed again, which ensures that the steering can be controlled by human hand in the case of extreme failure.

However, due to the limited space in the car, the arrangement of the steering column and the clutch will inevitably be limited, and at the same time, the original installation convenience of the steering-by-wire system will be sacrificed.

Utility model content

An embodiment of the present application provides a steer-by-wire system to solve the problem of limited space caused by using a steering column and a clutch for fault tolerance in an existing steer-by-wire system and sacrificing the installation convenience of the original system.

In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions:

The first aspect of the present application provides a steer-by-wire system, which includes

steering wheel;

a torsion bar assembly connected to the steering wheel;

a piston cylinder, the piston cylinder is sleeved on the end of the torsion bar assembly away from the steering wheel, and is used to accommodate hydraulic fluid;

a piston, the piston is movably socketed on the torsion bar assembly in the piston barrel, so as to divide the piston barrel into a first cavity and a second cavity, and the piston can move with the torsion bar assembly The rotation of the piston cylinder reciprocates along the axial direction of the torsion bar assembly;

Steering cylinder, the steering cylinder is provided with a steering rod, and the two ends of the steering rod protrude from the steering cylinder for connecting tires; the steering cylinder is provided with a hydraulic chamber, and the steering rod located in the hydraulic chamber dividing the hydraulic chamber into a first hydraulic chamber and a second hydraulic chamber along the axial direction of the steering rod;

A first pipeline, the two ends of the first pipeline communicate with the upper chamber and the first hydraulic chamber respectively;

A second pipeline, the two ends of the second pipeline communicate with the lower chamber and the second hydraulic chamber respectively, and the second pipeline communicates with the first pipeline;

A solenoid valve, the solenoid valve is arranged at the connection between the first pipeline and the second pipeline, and is used to conduct or block the connection between the first pipeline and the second pipeline;

The cross-sectional shape of the piston perpendicular to its axial direction is non-circular, and the inner wall of the piston cylinder is in close contact with the outer wall of the piston.

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

When the wire control part of the steer-by-wire system is abnormal, the solenoid valve is closed to separate the piston cylinder into the upper cavity and the lower cavity which are not connected to each other.

In some modified implementations of the first aspect of the present application, the aforementioned steer-by-wire system, wherein two seals are provided at intervals along the axial direction of the steering cylinder, and the seals are sleeved on the outside of the steering rod, The hydraulic chamber is formed between the two seals.

In some modified implementations of the first aspect of the present application, in the aforementioned steer-by-wire system, the steering rod located in the hydraulic chamber is provided with blades, and the blades are arranged around the axial direction of the steering rod for a circle, so as to The first hydraulic chamber and the second hydraulic chamber are formed on both sides of the blade along the axial direction of the steering rod.

In some modified implementations of the first aspect of the present application, the aforementioned steer-by-wire system, wherein the blades interfere with the inner wall of the steering cylinder.

In some modified implementations of the first aspect of the present application, the aforementioned steer-by-wire system, wherein at least the part of the torsion bar assembly located in the piston barrel is a screw;

The inner wall of the piston is in rolling fit with the screw rod through balls.

In some modified implementations of the first aspect of the present application, the aforementioned steer-by-wire system further includes a controller assembly and a steering drive assembly;

The steering drive assembly is movably connected with the steering rod so as to be able to drive the steering rod to reciprocate along its axial direction;

The torsion bar assembly includes a torsion bar and a torque sensor; the torsion bar is connected to the steering wheel, and the torque sensor is connected to the torsion bar;

The controller assembly is signal-connected with the torque sensor so as to be able to calculate and control the steering angle of the steering rod according to the torque of the torsion bar through the steering drive assembly.

In some modified implementations of the first aspect of the present application, the aforementioned steer-by-wire system, wherein the torsion bar assembly further includes a first worm gear and a first worm;

The first turbine is socketed on the end of the torsion bar away from the steering wheel;

The first worm is in contact with the controller assembly, and the first worm is meshed with the first worm gear;

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

In some modified implementations of the first aspect of the present application, the aforementioned steer-by-wire system, wherein the steering drive assembly includes a motor assembly, a second worm, a second worm gear, and a steering gear;

The motor assembly is signal-connected to the controller assembly, and the motor assembly meshes with the second turbine through the second worm;

The second turbine meshes with the steering rod through the steering gear;

Wherein, the driving data at least includes the phase current of the motor assembly.

A second aspect of the present application provides a vehicle, which includes the foregoing steer-by-wire system.

Compared with the prior art, the steer-by-wire system provided in the first aspect of the present application has an upper cavity and a lower cavity on the steering wheel side, a first hydraulic chamber and a second hydraulic chamber on the steering cylinder side, and the wire control part is normal. At this time, the solenoid valve conducts the upper chamber and the lower chamber, so that the steering wheel drives the hydraulic fluid to flow in the piston barrel during the movement of the piston, and will not push the steering rod in the first hydraulic chamber or the second hydraulic chamber. ; When the wire control part is extremely ineffective, the solenoid valve is closed to isolate the upper cavity and the lower cavity, then when the steering wheel drives the piston in the process of movement, the upper cavity and the lower cavity are not connected, and the hydraulic fluid is pressed into the first cavity. The hydraulic chamber or the second hydraulic chamber is used to push the steering rod to move laterally, so that the steering can be manually controlled even when the wire control is extremely ineffective, effectively ensuring driving safety. It effectively solves the problem of limited space caused by using the steering column and clutch for fault tolerance in the existing steer-by-wire system, and the problem of sacrificing the installation convenience of the original system.

Description of drawings

The above and other objects, features and advantages of the exemplary embodiments of the present application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present application are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

FIG. 1 schematically shows a schematic structural view of a steering-by-wire system provided by an embodiment of the present application;

FIG. 2 schematically shows a structural block diagram of a steer-by-wire system provided by an embodiment of the present application;

Explanation of reference numerals: steering wheel 1, torsion bar assembly 2, torsion bar 21, pipe column 22, torque sensor 23, first turbine 24, first worm 25, piston cylinder 3, upper chamber 31, lower chamber 32, Piston 4, ball 41, solenoid valve 5, steering cylinder 6, steering rod 61, blade 611, hydraulic chamber 62, first hydraulic chamber 621, second hydraulic chamber 622, seal 63, first pipeline 7, second pipe Road 8, tire 9, controller assembly 10, steering drive assembly 11, motor assembly 111, second worm 112, second turbine 113, steering gear 114.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although 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 by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

It should be noted that, unless otherwise specified, technical terms or scientific terms used in this application shall have the usual meanings understood by those skilled in the art to which this application belongs.

The technical solution of the embodiment of the present application is to solve the above-mentioned technical problems, and the general idea is as follows:

Example 1

Referring to accompanying drawing 1, the steer-by-wire system provided by the 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 Road 8; the torsion bar assembly 2 is connected to the steering wheel 1; the piston barrel 3 is sleeved on the end of the torsion bar assembly 2 away from the steering wheel 1 for containing hydraulic fluid; the piston 4 is in The piston barrel 3 is movably socketed on the torsion bar assembly 2 to separate the piston barrel 3 into an upper cavity 31 and a lower cavity 32, and the piston 4 can move with the torsion bar assembly 2. Rotate in the piston cylinder 3 and reciprocate along the axial direction of the torsion bar assembly 2; the steering cylinder 6 is provided with a steering rod 61, and the two ends of the steering rod 61 protrude from the steering cylinder 6 for The tire 9 is connected; the steering cylinder 6 is provided with a hydraulic chamber 62, and the steering rod 61 located in the hydraulic chamber 62 divides the hydraulic chamber 62 into a first hydraulic chamber 621 and a first hydraulic chamber 621 along the axial direction of the steering rod 61. The second hydraulic chamber 622; the two ends of the first pipeline 7 communicate with the upper chamber 31 and the first hydraulic chamber 621 respectively; the two ends of the second pipeline 8 respectively communicate with the lower The cavity 32 and the second hydraulic chamber 622 are in communication with each other, and the second pipeline 8 is in communication with the first pipeline 7; the solenoid valve 5 is arranged between the first pipeline 7 and the The connection of the second pipeline 8 is used to connect or cut off the connection between the first pipeline 7 and the second pipeline 8 .

Specifically, in order to solve the problem of limited space caused by using the steering column and clutch for fault tolerance in the existing steering-by-wire system and sacrificing the installation convenience of the original system, the steering-by-wire system provided in this embodiment retains the original control-by-wire steering system. Steering control structure and control program, the upper cavity 31 and the second cavity 32 containing hydraulic fluid are additionally set on the side of the steering wheel 1, the first hydraulic cavity 621 and the second hydraulic cavity 622 are set on the side of the steering cylinder 6, and through the first A pipeline 7 and a second pipeline 8 communicate with the upper chamber 31 and the first hydraulic chamber 621, the second chamber 32 and the second hydraulic chamber 622, and connect the first pipeline 7 and the second pipeline 8 at the same time , and a solenoid valve 5 is set at the connection, so that 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 between the upper cavity 31 and the lower cavity 32 The reciprocating flow between them will not enter the first hydraulic chamber 621 or the second hydraulic chamber 622 downwards to impact the steering rod 61; when the wire control part is abnormal or extremely ineffective, the solenoid valve 5 will cut off the communication between the two pipelines, and the upper chamber will 31 communicates with the first hydraulic chamber 621 in one direction, and the lower chamber 32 communicates with the second hydraulic chamber 622 in one direction. With the rotation of the steering wheel 1, the piston 4 moves up and down to squeeze the hydraulic fluid into the first hydraulic chamber 621 or the second hydraulic chamber 621. Two hydraulic chambers 622, so as to drive the steering rod 61 to move laterally to realize manual steering control, so that the steering column and clutch, which are rigid and occupy a large installation space, can be replaced by flexible and flexible pipelines in the steer-by-wire system, avoiding It can effectively ensure the convenience of installation of the steer-by-wire system without taking up too much space and will not affect the installation position of other components. At the same time, it can also improve the collision safety of the vehicle through the flexible structure of the pipeline.

Among them, the steering-by-wire system is a vehicle control steering system that can be easily understood and implemented by those skilled in the art, and it realizes steering control through the control of electrical signals. The steering-by-wire control system provided in this embodiment also includes the electrical signal control part structure and Program, for example: with reference to accompanying drawing 2, controller assembly 10 and steering drive assembly 11, controller assembly 10 can acquire the torque of steering wheel 1 and control steering rod 61 lateral movement according to this torque through steering drive assembly 11, namely vehicle Steering, the controller assembly 10 can also generate a simulated road surface load according to the driving data of the steering drive assembly 11 and transmit it to the steering wheel 1, so that the driver can accurately grasp the road feeling; the above-mentioned features can be easily understood by those skilled in the art. I won't go into too much detail here. At the same time, in the embodiment provided by this solution, 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 barrel 3 can flow between the upper cavity 31 and the lower cavity 32. When the reciprocating flow will not enter the first hydraulic chamber 621 or the second hydraulic chamber 622 downwards to impact the steering rod 61, the lateral movement of the lower steering rod 61 will not drive the rotation of the upper torsion bar assembly 2 and the steering wheel 1.

Wherein, the torsion bar assembly 2 is a rod-shaped structure, which is fixedly connected to the steering wheel 1 on the upper side of the vehicle body, so as to be able to transmit the torque of the steering wheel 1 to the piston 3 and the controller assembly 10; in this embodiment, the torsion bar assembly 2 may include a torsion bar 21 with specified elasticity and a rigid column 22, one end of the torsion bar is fixedly connected to the steering wheel 1, and the other end is fixedly connected to the column, so that the controller assembly 10 can be connected to the column through the torsion bar 21 The angle difference of 22 cooperates with the torque sensor 23 to calculate the torque of the steering wheel 1 and convert it into the rotation angle of the steering rod 61 and transmit it to the steering drive assembly 11 .

Wherein, the piston cylinder 3 is a rigid cylinder, and its specific shape is not limited here, it can be a cylinder, etc.; the piston 4 is a rigid structure, and the piston 4 is coaxially arranged with the piston cylinder 3. The side walls extending along its axial direction are all in contact with the inner wall of the piston cylinder 3, and then the upper and lower sides of the piston 4 respectively form an upper cavity 31 and a lower cavity 32, both of which contain hydraulic fluid; the piston 4 and the pipe column 22 Screwed, so that when the torque of the steering wheel 1 is transmitted to the pipe column 22 , the piston 4 can reciprocate in the piston barrel 3 along the axial direction of the pipe column 22 .

Wherein, the steering cylinder 6 and the steering rod 61 are arranged on the lower side of the car body corresponding to the tire 9, the steering cylinder 6 and the steering rod 61 are all rigid structures, and the steering rod 61 is coaxial with the steering cylinder 6 and passes through the steering cylinder 6 for use. To connect the tires 9, so that the steering rod 61 moves laterally under the control of the steering drive assembly 11 to realize the steering of the tires 9, that is, the vehicle body. Parts of the steering cylinder 6 are spaced to form hydraulic chambers 62 to accommodate hydraulic fluid, for example, partitioned by partitions or sealing plates; the steering rod 61 in the hydraulic chamber 62 divides the hydraulic chamber 62 into a second section that is not connected to each other. A hydraulic chamber 621 and a second hydraulic chamber 622 can be realized by setting a partition or a sealing plate on the outer wall of the steering rod 61, so that when the hydraulic fluid impacts the first hydraulic chamber 621, the steering rod 61 can move toward the second hydraulic chamber 622. On the contrary, when the hydraulic fluid impacts the second hydraulic chamber 622 , the steering rod 61 can move laterally toward the first hydraulic chamber 621 .

Wherein, the first pipe body 7 and the second pipe body 8 are flexible pipe bodies, which are resistant to oil and corrosion, and can accommodate hydraulic fluid, such as hydraulic oil. The connection between the first pipe body 7 and the second pipe body 8 can be arranged on the outer wall of the piston cylinder 3 as shown in Figure 1, to avoid taking up too much space, the solenoid valve 5 is arranged inside, and when the solenoid valve 5 is turned on, the first The first pipe body 7 and the second pipe body 8 are connected, then the upper chamber 31 and the lower chamber 32 are also connected at this time; correspondingly, when the electromagnetic valve 5 is closed, the first pipe body 7 and the second pipe body 8 are connected to each other. The upper cavity 31 and the lower cavity 32 are not connected to each other; it can be understood that: when the electrical signal transmission part of the steering-by-wire system is normal, the signal connection between the controller assembly 10 and the solenoid valve 5 or When the power supply relationship is normal, the solenoid valve 5 can maintain the conduction between the first pipe body 7 and the second pipe body 8. At this time, the hydraulic fluid can flow between the upper cavity 31 and the lower cavity 32 of the piston 4, and will not There is hydraulic fluid impacting the first hydraulic chamber 621 or the second hydraulic chamber 622; on the contrary, when the signal transmission part of the steer-by-wire system is abnormal or extremely ineffective, the signal connection or power supply relationship between the controller assembly 10 and the solenoid valve 5 is disconnected. When opened, the solenoid valve 5 cuts off the conduction between the first pipe body 7 and the second pipe body 8. At this time, the upper chamber 31 and the lower chamber 32 of the piston 4 cannot flow hydraulic fluid, and the hydraulic fluid will enter the first hydraulic pressure chamber. The cavity 621 or the second hydraulic cavity 622 impacts the steering rod 61 to cause it to move laterally, that is, to realize manual control of the steering. Of course, the communication port between the first tube body 7 and the upper cavity 31 and the communication port between the second tube body 8 and the lower cavity 32 are preferably located on the same side of the piston cylinder 3 to avoid entanglement during the extension of the tube body.

Wherein, the solenoid valve 5 is a valve body capable of realizing on-off control through electric signals. In this embodiment, it is preferably a normally closed solenoid valve, which is electrically connected to the controller assembly 10 and receives the power supply of the controller assembly 10. The controller When the power supply is normal when the assembly 10 is normal, the solenoid valve 5 remains on; correspondingly, when the controller assembly 10 is abnormal or extremely ineffective, the low-voltage power supply of the vehicle is lost, and the solenoid valve 5 cannot be powered, and the solenoid valve 5 automatically becomes In the closed state, the reaction rate is greatly improved, and the solenoid valve 5 can be automatically closed at the same time when an abnormality or extreme failure occurs, without additional control.

According to the above list, in the steer-by-wire system provided in the first aspect of the present application, the upper chamber 31 and the lower chamber 32 are arranged on the side of the steering wheel 1, and the first hydraulic chamber 621 and the second hydraulic chamber 622 are arranged on the side of the steering cylinder 6, When the online control part is normal, the solenoid valve 5 conducts the upper cavity 31 and the lower cavity 32, so that the steering wheel 1 drives the piston 4 to flow the hydraulic fluid in the piston barrel 3 during the movement, and will not affect the first hydraulic cavity 621 or the second hydraulic cavity 621. The steering rod 61 in the second hydraulic chamber 622 plays a driving role; when the wire control part is extremely ineffective, the solenoid valve 5 is closed to isolate the upper chamber 31 and the lower chamber 32, then when the steering wheel 1 drives the piston 4 during the movement , the upper cavity 31 and the lower cavity 32 are not connected, and the hydraulic fluid is pressed into the first hydraulic cavity 621 or the second hydraulic cavity 622 to push the steering rod 61 to move laterally, so that the remote control can still be carried out in the event of an extreme failure of the wire control. Manually control the steering to effectively ensure driving safety. It effectively solves the problem of limited space caused by using the steering column and clutch for fault tolerance in the existing steer-by-wire system, and the problem of sacrificing the installation convenience of the original system.

The term "and/or" in this article is just an association relationship describing associated objects, indicating that there may be three relationships, for example, A and/or B, specifically understood as: A and B can be included at the same time, and A and B can be included separately A exists, B may exist alone, and any of the above three situations can be met.

Further, in the steer-by-wire system provided by this embodiment, in specific implementation, the cross-sectional shape of the piston 4 perpendicular to its axial direction is non-circular, and the inner wall of the piston barrel 3 and the outer wall of the piston 4 fit together.

Specifically, in order to ensure driving safety, the up and down movement of the piston 4 is limited in this embodiment to be realized only by the rotation of the steering wheel 1, and then the cross-sectional shape of the piston 4 perpendicular to its axial direction is set to be non-circular, for example : racetrack shape, regular hexagon, rectangle, etc., and then the piston 4 has an edge-limiting relationship with the inner wall of the piston cylinder 3 in the axial direction around it, and cannot rotate naturally and downward under the action of gravity Movement, thus effectively ensuring driving safety.

Further, referring to the accompanying drawing 1, the steer-by-wire system provided by this embodiment, in a specific implementation, two seals 63 are provided at intervals along the axial direction of the steering cylinder 6, and the seals 63 are sleeved on the The hydraulic cavity 62 is formed between the two seals 63 outside the steering rod 61 .

Specifically, in order to realize the setting of the hydraulic chamber 62 in the steering cylinder 6, in this embodiment, two seals 63 are arranged at intervals along the axial direction in the steering cylinder 6, and the seals 63 can be sealing rubber sleeves or It may be a sealant coated on the outside of the partition, the inner wall is sleeved on the steering rod 61, and the outer wall is in contact with the inner wall of the steering cylinder 6, so that a space is formed between the two seals 63 and the inside of the steering cylinder 6 to form the hydraulic chamber. 62. Wherein, the setting position and size of the hydraulic chamber 62 are not specifically limited here, and can be designed and adjusted according to actual needs.

Further, referring to FIG. 1 , the steer-by-wire system provided in this embodiment, in specific implementation, the steering rod 61 located in the hydraulic chamber 62 is provided with a vane 611 , and the blade 611 wraps around the steering rod 61 The axial direction of the steering rod 61 is arranged one turn, so as to form the first hydraulic chamber 621 and the second hydraulic chamber 622 on both 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 vane 611 is arranged on the outer wall of the guide rod 61, and the vane 611 is a rigid structure, which can be combined with The vanes 611 are integrally provided and can also be additionally connected. The blade 611 is arranged around the axial direction of the steering rod 61 for one circle, and the end of the blade 611 away from the steering rod 61 is in conflict with the inner wall of the steering cylinder 6, thereby forming a first hydraulic chamber 621 and a second hydraulic chamber 622 which are independent of each other. .

Further, referring to the accompanying drawing 1, the steer-by-wire system provided by this embodiment, in specific implementation, at least the part of the torsion bar assembly 2 inside the piston barrel 3 is a screw; the inner wall of the piston 4 is passed through the ball 41 is in rolling fit with the screw rod.

Specifically, in order to realize that the piston 4 can reciprocate axially along the torsion bar assembly 2 with the rotation of the steering wheel 1, in this embodiment, at least the part of the torsion bar assembly 2 located in the piston cylinder 3 is set as a screw , that is, the aforementioned pipe string 22 is in the form of a screw, and in order to reduce the friction between the piston 4 and the pipe string 22 during the movement and improve the compliance of the system, a ball 41 is provided, and the threaded connection between the piston 4 and the pipe string 22 is realized by the ball 41 , forming a ball screw fit structure.

Further, with reference to accompanying drawings 1 and 2, the steer-by-wire system provided by this embodiment further includes a controller assembly 10 and a steering drive assembly 11; The steering rod 61 is movably connected so as to be able to drive the steering rod 61 to reciprocate along its axial direction; the torsion bar assembly 2 includes a torsion bar 21 and a torque sensor 23; the torsion bar 21 is connected to the steering wheel 1, The torque sensor 23 is connected to the torsion bar 21; the controller assembly 10 is connected to the torque sensor 23 in signal, so that it can be calculated according to the torque of the torsion bar 21 and passed through the steering drive assembly 11 The steering angle of the steering rod 61 is controlled.

Specifically, the controller assembly 10 at least includes a power motor (not shown in the figure) and a controller (not shown in the figure), the controller is used to store and execute the steer-by-wire program, which can The detection data is calculated to obtain the angle at which the steering wheel 1 intends to control the rotation of the vehicle body and transmits it to the steering power motor; the power motor is connected to the controller signal to provide the driving power for the torsion bar assembly 2 to the steering wheel 1 according to the control of the controller; The power assembly 11 includes at least a steering power motor and a transmission assembly, the steering power motor is connected with the controller signal, so as to laterally drive the steering rod 61 through the transmission assembly according to the control of the controller. Specifically, the steer-by-wire program stored and executed in the controller can be easily understood and obtained by those skilled in the art, and will not be repeated here.

Further, with reference to accompanying drawings 1 and 2, the steer-by-wire system provided by this embodiment, in specific implementation, the torsion bar assembly 2 further includes a first worm gear 24 and a first worm 25; the first worm gear 24 is socketed on the end of the torsion bar 21 away from the steering wheel 1; the first worm 25 is connected to 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 surface load according to the driving data of the steering drive assembly 11 and transmit it to the steering wheel 1 through the torsion bar assembly 2 .

Specifically, in order to have real road feel feedback during steer-by-wire control, in this embodiment, a transmission structure that cooperates with the first worm gear 24 and the first worm 25 is provided at the end of the torsion bar 21 away from the steering wheel 1, so that the control When the steering assembly 10 can generate a simulated road surface load according to the driving data of the steering drive assembly 11, it can be transmitted to the steering wheel 1 through the transmission assembly of the first turbine 24 and the first worm 25 and the torsion bar 21, so that the driving The above-mentioned content related to the road feeling feedback is a program that can be easily understood and obtained by those skilled in the art, and will not be repeated here.

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

Specifically, in order to realize that the controller assembly 10 completes the steering of the vehicle through signals, in this embodiment, the steering drive assembly 11 is set to include a motor assembly 111, a second worm 112, a second turbine 113 and a steering gear 114; the motor assembly 111 is used to provide driving force, and the second worm 112, the second worm gear 113 and the steering gear 114 form the transmission assembly of the driving force of the motor assembly 111 to the steering rod 61, and the above settings can be easily understood by those skilled in the art Yes, I won’t go into too much detail here.

Example 2

This embodiment provides a vehicle, which includes the foregoing steer-by-wire system.

Specifically, the steer-by-wire system is the steer-by-wire system described in Embodiment 1. For its specific structure and working principle, please refer to the detailed description of Embodiment 1, and details will not be repeated here.

The above is only a specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. Should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be determined by the protection scope of the claims.

Claims (10)

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;

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;

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;

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.

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;

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.

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

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.

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