CN117719587A - Wire-control electric power steering column and vehicle - Google Patents

Abstract

The invention provides a drive-by-wire electric power steering column and a vehicle, which comprise a steering wheel, a sensor assembly, a shaft assembly, a controller and a load centering mechanism, wherein the steering wheel is fixedly arranged at one end of the shaft assembly; when steering, the controller receives signals collected by the sensor assembly and controls the external steering actuating mechanism to implement power-assisted steering after operation, and meanwhile, the controller receives signals collected by the sensor assembly and controls the load aligning mechanism after operation to play a damping role on the steering wheel; when the steering wheel is not turned, the load centering mechanism drives the steering wheel to perform centering. The steering column and the external steering actuating mechanism are controlled to work by completely depending on electronic and electric elements, so that the installation position of a steering system is not limited, and the operation space of a driver is large.

Description

Wire-control electric power steering column and vehicle

Technical Field

The invention relates to the technical field of automobile steering columns, in particular to a wire-control electric power steering column and a vehicle.

Background

Automotive steering systems undergo a transition from mechanical, hydraulic, electro-hydraulic hybrid to electric power assisted systems. With the increasing popularity of automobiles, the performance of the automobiles has been related to various economic and social problems such as life and property, traffic safety, energy environmental protection, economic benefits and the like.

The mechanical steering system has simple structure and lower cost, but the steering is heavier and the stability is not high, so in order to solve the problems, the hydraulic steering system has been greatly developed in recent years, the problem of heavy steering of the mechanical steering system is improved, and meanwhile, the hydraulic steering system also brings a plurality of problems. The hydraulic power-assisted steering system and the electrohydraulic hybrid power-assisted steering system both use hydraulic oil as a power source, and parts such as an oil pipe, an oil pump and an oil tank are involved in the hydraulic power-assisted steering system and the electrohydraulic hybrid power-assisted steering system, so that the problems of high number of parts, difficult installation and arrangement, low efficiency, environmental pollution and the like exist. And the stability and the safety of the hydraulic steering system are not high. Therefore, at present, automobile manufacturers and scientific research institutions at home and abroad are developing new power-assisted steering systems, and an electric power-assisted steering system is one of the power-assisted steering systems.

Electric power steering systems, and the like, which are popular at present, belong to steering systems based on mechanical components. In the evolution process of the mechanical systems, although the force transmission characteristic of the steering system is optimized, the power assistance is provided for steering control, and the steering stability and smoothness of the automobile are improved, the steering column is mechanically connected with a steering machine (steering gear) through a middle shaft, so that the installation position of the existing steering system is greatly limited, the operation space of a driver is small, abnormal noise exists during steering, and the control performance is low.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a wire-control electric power steering column and a vehicle, and solves the problems that the installation position of a steering system is greatly limited, the operation space of a driver is small, abnormal noise exists during steering, and the control performance is low in the prior art.

In order to achieve the above object, the present invention provides the following technical solutions: the utility model provides a drive-by-wire electric power steering column, includes steering wheel, sensor assembly, axle assembly, controller and load centering mechanism, steering wheel fixed mounting is in axle assembly one end, the sensor assembly is including installing the first sensor that is used for gathering steering wheel moment of torsion signal and rotation angle signal on the axle assembly to and be used for gathering the second sensor of wheel motion state signal, load centering mechanism is connected with the axle assembly one end that deviates from the steering wheel, the controller is connected with sensor assembly, load centering mechanism and outside steering actuator electricity respectively; when steering, the controller receives signals collected by the sensor assembly and controls the external steering actuating mechanism to implement power-assisted steering after operation, and meanwhile, the controller receives signals collected by the sensor assembly and controls the load centering mechanism to work after operation, so that a damping effect is achieved on the steering wheel rotation direction; and when the steering wheel is not turned, the load centering mechanism drives the steering wheel to be centered.

The shaft assembly comprises an input shaft upper portion, an input shaft lower portion, an output shaft, a spline shaft and an elastic torsion bar, wherein the steering wheel is fixedly installed on the input shaft upper portion, the input shaft upper portion and the input shaft lower portion are connected through a spline shaft spline pair and coaxially rotate, the input shaft lower portion and the output shaft are connected through a key and a key groove, a rotating angle exists between the input shaft lower portion and the output shaft, a body and a rotor of the first sensor are respectively installed on the input shaft lower portion and the output shaft, one end of the elastic torsion bar is in press fit with the input shaft lower portion and is in interference fit with the input shaft lower portion, the other end of the elastic torsion bar extends into the output shaft and is connected with the output shaft through a press pin, the output shaft is installed in a lower shell in a rotating mode through a first bearing and a second bearing, and a gland is connected to the end of the lower shell in a threaded mode and used for axially limiting the first bearing.

The rotation angle between the lower part of the input shaft and the output shaft is +/-4.5 degrees.

The rigidity of the elastic torsion bar is 2.0-3 N.M/°.

The steering wheel is characterized by further comprising a switch assembly and a mounting seat assembly, wherein the mounting seat assembly is arranged on the outer side of the shaft assembly, the shaft assembly and the mounting seat assembly rotate relatively, the switch assembly is mounted on one end, close to the steering wheel, of the mounting seat assembly, and the lower shell is connected with one end, far away from the steering wheel, of the mounting seat assembly.

And the output shaft is provided with a limiting mechanism for limiting the rotation angle of the steering wheel.

The limiting mechanism comprises a limiting nut and two limiting columns, wherein the limiting nut is sleeved on the output shaft, the limiting nut is in threaded connection with the output shaft, the limiting nut is axially and slidably connected with the inner wall of the lower shell, and the two limiting columns are symmetrically distributed on two sides of the sliding direction of the limiting nut.

The load aligning mechanism comprises a load motor, a worm and a worm wheel, wherein the output end of the load motor extends into the lower shell and is connected with the worm through a buffer pad, the worm wheel is pressed on the output shaft, and the worm wheel are meshed.

The controller is an integrated full-redundancy motor controller, and the first sensor is a torque corner full-redundancy sensor.

The invention also discloses a vehicle comprising the wire-control electric power steering column.

Compared with the prior art, the technical scheme has the following technical effects:

the invention removes intermediate shaft connection between the drive-by-wire electric power steering column and an external steering actuating mechanism (R-EPS steering device), and completely depends on electronics and electric elements to control the work, so that the installation position of the steering system is not limited, the operation space of a driver is large, abnormal sound is avoided during steering, the control performance is greatly enhanced, and the damage of the steering column to the driver in collision accidents is avoided; according to the invention, the first sensor is used for collecting the torque signal and the rotation angle signal of the steering wheel, the second sensor is used for collecting the motion state signal of the wheels, the controller is used for receiving the signals and processing and controlling the steering wheel to realize reasonable steering, and the controller is used for sending a command to the load aligning mechanism, so that the road sense is simulated, and the steering wheel of a driver has a real sense.

In addition, the wire-control electric power steering column provided by the invention is provided with a limiting structure for the rotation angle of the steering wheel, so that the left and right limiting positions of the wire-control electric power steering column are limited, and the wire-control electric power steering column meets the design requirements.

The first bearing and the second bearing are distributed on the same side of the worm wheel, so that the positioning accuracy of the worm wheel is greatly improved.

The controller selects the integrated full-redundancy motor controller, and the first sensor selects the torque corner full-redundancy sensor, so that the stable, reliable and safe operation of the wire-control electric power steering column is ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a schematic diagram of a load leveling mechanism of the present invention;

fig. 4 is a schematic view of a spacing mechanism of the present invention.

Description of main reference numerals:

1. a steering wheel; 2. a sensor assembly; 21. a first sensor; 3. a shaft assembly; 31. an input shaft upper portion; 32. the lower part of the input shaft; 33. an output shaft; 34. a spline shaft; 35. an elastic torsion bar; 36. a first bearing; 37. a second bearing; 4. a controller; 5. a load return mechanism; 51. a load motor; 52. a worm; 53. a worm wheel; 6. a lower housing; 7. a gland; 8. a switch assembly; 9. a mounting seat combination; 10. a limiting mechanism; 101. a limit nut; 102. and a limit column.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Drive-by-wire electric power steering column embodiments

As shown in fig. 1 to 4, the electric power steering column of the present embodiment includes a steering wheel 1, a sensor assembly 2, a shaft assembly 3, a controller 4 and a load centering mechanism 5, wherein the steering wheel 1 is fixedly mounted at one end of the shaft assembly 3, the sensor assembly 2 includes a first sensor 21 mounted on the shaft assembly 3 for collecting a torque signal and a rotation angle signal of the steering wheel 1, and a second sensor for collecting a wheel movement state signal, the load centering mechanism 5 is connected with one end of the shaft assembly 3 away from the steering wheel 1, and the controller 4 is respectively electrically connected with the sensor assembly 2, the load centering mechanism 5 and an external steering executing mechanism; during steering, the controller 4 receives signals collected by the sensor assembly 2 and controls the external steering actuating mechanism to implement power-assisted steering after operation, and meanwhile, the controller 4 receives signals collected by the sensor assembly 2 and controls the load correcting mechanism 5 to work after operation, so that a damping effect is achieved on the rotating direction of the steering wheel 1; in the non-steering state, the load return mechanism 5 drives the steering wheel 1 to return.

Specifically, the first sensor 21 and the second sensor are signal acquisition modules, the controller 4 is a signal processing module, the external steering actuator is a signal execution module, when the driver manipulates the steering wheel 1 to rotate, the steering wheel 1 drives the first sensor 21, the first sensor 21 comprises two measuring loops of a torque signal and a rotation angle signal, the first sensor 21 respectively converts the measured torque signal and the rotation angle signal into electric signals and transmits the electric signals to the controller 4, meanwhile, the controller 4 receives wheel motion state signals collected by the second sensor, such as a vehicle speed, a longitudinal acceleration, a yaw rate and the like, based on the signals, the controller 4 performs logic operation and analog operation processing, and sends a control instruction to an R-EPS steering gear in the external steering actuator, so that reasonable steering (the external steering actuator belongs to the prior art, and is not repeated here), on the other hand, the controller 4 receives the wheel information collected by the second sensor, the state information of the structural vehicle, after the controller 4 performs logic operation and analog operation processing, sends corresponding wheel motion state signals to the load steering mechanism 5, such as a vehicle speed, a vertical acceleration, a yaw rate and the like, and when the load steering wheel 5 is positively rotated by the driver, the load steering mechanism 1 does not feel the load steering wheel 1, and the load steering mechanism is positively and positively rotates, and the load steering wheel 1 does not feel the load feedback mechanism when the steering wheel 1 positively receives the load state information.

According to the invention, the connection of the intermediate shaft between the drive-by-wire electric power steering column and an external steering actuating mechanism (R-EPS steering) is eliminated, and the operation is controlled by completely relying on electronics and electric elements, so that the installation position of the steering system is not limited, the operation space of a driver is large, abnormal sound is avoided during steering, the control performance is greatly enhanced, the damage of the steering column to the driver in a collision accident is avoided, and the unevenness of the ground and the unbalance of the steering wheel 1 are not transferred to the steering column due to the elimination of the mechanical connection of the intermediate shaft, thereby improving the driving comfort of an automobile and reducing the fatigue of the driver.

Through the design to the controller, the controller 4 can judge whether the operation of driver is reasonable according to the running state of car to make corresponding adjustment, it can automatic control car stability under the limit operating mode. The steering ratio (the ratio of the turning angle of the steering wheel 1 to the turning angle of the wheels) based on the relevant parameters of the vehicle speed, traction control and the like is continuously changed, and the steering ratio is low when the vehicle runs at a low speed, so that the turning angle of the steering wheel 1 can be reduced when the vehicle turns or stops; when running at high speed, the steering ratio becomes larger, and better straight running conditions are obtained.

In a specific embodiment, the shaft assembly 3 includes an input shaft upper portion 31, an input shaft lower portion 32, an output shaft 33, a spline shaft 34, and an elastic torsion bar 35, the steering wheel 1 is fixedly mounted on the input shaft upper portion 31, the input shaft upper portion 31 and the input shaft lower portion 32 are connected through a spline pair of the spline shaft 34 and coaxially rotate, the input shaft lower portion 32 and the output shaft 33 are connected through a key and a key groove, a rotation angle exists between the input shaft lower portion 32 and the output shaft 33, the body and the rotor of the first sensor 21 are respectively mounted on the input shaft lower portion 32 and the output shaft 33, one end of the elastic torsion bar 35 is press-mounted in the input shaft lower portion 32 and in interference fit with the input shaft lower portion 32, the other end of the elastic torsion bar 35 extends into the output shaft 33 and is connected with the output shaft 33 through a press pin, the output shaft 33 is rotatably mounted in the lower housing 6 through a first bearing 36 and a second bearing 37, and a gland 7 is screwed at an end of the lower housing 6 for axially limiting the first bearing 36.

Specifically, the steering wheel 1 is fixed on the upper portion 31 of the input shaft through a hexagonal flange nut, the upper portion 31 of the input shaft is connected with the spline shaft 34 through a spline pair, the spline shaft 34 is welded with the lower portion 32 of the input shaft, the upper portion 31 of the input shaft, the spline shaft 34 and the lower portion 32 of the input shaft form a coaxial rotatable integral structure, the first bearing 36 and the second bearing 37 are pressed on the output shaft 33, the gland 7 is in threaded connection with the end portion of the lower shell 6 and presses the left end face of the first bearing 36, the first bearing 36 is prevented from moving axially, and the output shaft 33 is limited axially inside the lower shell 6 through two hexagonal nuts installed at the end portion of the output shaft 33, so that the output shaft 33 and the lower shell 6 are connected in a better rotating mode.

When the driver steers the steering wheel 1 clockwise, the steering wheel 1 drives the upper part 31 of the input shaft and the lower part 32 of the input shaft to rotate, the body welded with the lower part 32 of the input shaft rotates, the elastic torsion bar 35 absorbs the part of the rotating torque to generate elastic deformation, the output shaft 33 and the rotor assembled on the output shaft 33 are not subjected to any rotating torque to rotate, at the moment, a certain phase difference (angle difference) is generated between the body of the first sensor 21 and the rotor, the phase difference is converted into a torque electric signal, the controller 4 receives the electric signal, meanwhile, the controller 4 receives wheel information acquired by the second sensor, combines with the state information of the vehicle, and gives an instruction to the R-EPS steering actuator motor in the external steering actuator, meanwhile, the controller 4 controls the load centering mechanism 5 to work through another preset force model, the load centering mechanism 5 drives the output shaft 33 to rotate in the same direction as the steering wheel 1 (clockwise), when the steering wheel 1 is released, the body of the first sensor 21 and the rotor are not subjected to an angle difference, the external R-EPS steering actuator motor in the steering mechanism stops rotating the steering wheel 1 anticlockwise, and the load centering mechanism is not driven by the load centering mechanism 5.

In one embodiment, the angle of rotation between the input shaft lower portion 32 and the output shaft 33 is + -4.5 deg..

When the rotation angle of the steering wheel 1 is smaller than 4.5 °, the upper part 31 of the input shaft and the lower part 32 of the input shaft are simultaneously rotated, the output shaft 33 is fixed, the elastic torsion bar 35 is elastically deformed, the body and the rotor of the first sensor 21 generate a certain phase difference (angle difference), the phase difference is converted into a torque electric signal, the controller 4 receives the electric signal, meanwhile, the controller 4 receives the wheel information acquired by the second sensor, and after the state information of the vehicle is combined, the controller 4 sends an instruction to an R-EPS steering gear executing motor in the external steering executing mechanism to realize power steering, meanwhile, the controller 4 controls the load correcting mechanism 5 to work through another preset force model to generate damping action on the steering wheel 1, and when the rotation angle of the steering wheel 1 is approximately 4.5 °, the power steering reaches the maximum at this time.

In one embodiment, the stiffness of the resilient torsion bar 35 is 2.0-3N M/°.

In a specific embodiment, the steering wheel comprises a steering wheel body, a steering wheel body and a steering wheel cover, wherein the steering wheel body is provided with a steering wheel 1, the steering wheel cover is provided with a steering wheel cover, the steering wheel cover is provided with a steering wheel 1, and the steering wheel cover is provided with a switch assembly 8 and a mounting seat assembly 9, the mounting seat assembly 9 is arranged on the outer side of the steering wheel cover, the steering wheel cover is provided with a steering wheel cover, and the steering wheel cover is provided with a lower shell 6 and a mounting seat assembly 9.

The wire-control electric power steering column is arranged on the automobile frame through a positioning safety block on the lower shell 6 and the mounting seat combination 9.

Since the electric power steering column of the drive-by-wire does not have the mechanical connection of the intermediate shaft, the electric power steering column of the drive-by-wire cannot rely on the end position of the steering (steering gear) to carry out mechanical limitation, even if the electric power steering column of the drive-by-wire increases the end limitation function in software, the electric power steering column of the drive-by-wire can only be ensured to provide limitation for the rotation of the electric power steering column of the drive-by-wire under the condition of power supply, and the limit position of the electric power steering column of the drive-by-wire is not limited under the condition of no power supply, which can lead the steering wheel 1 to rotate randomly in the clockwise and anticlockwise directions for countless circles, thereby leading to the damage of the clock spring in the switch assembly 8, therefore, in a specific embodiment of the invention, the limiting mechanism 10 for limiting the rotation angle of the steering wheel 1 is arranged on the output shaft 33.

Specifically, the stop mechanism 10 includes a stop nut 101 and two stop posts 102, the stop nut 101 is sleeved on the output shaft 33, the stop nut 101 is in threaded connection with the output shaft 33, the stop nut 101 is axially slidably connected with the inner wall of the lower housing 6, and the two stop posts 102 are symmetrically distributed on two sides of the sliding direction of the stop nut 101.

The inner hole of the lower shell 6 is a square hole, the limit nut 101 is a square nut, and when the output shaft 33 rotates, the square hole of the lower shell 6 limits the output shaft 33 to rotate, and the limit nut 101 can slide left and right along the inner wall of the lower shell 6.

The inner wall of the lower shell 6 can be provided with a sliding groove along the left-right direction, the outer wall of the limit nut 101 is provided with a sliding block, and the limit nut 101 is in sliding connection with the inner wall of the lower shell 6 through the sliding block and the sliding groove.

When the driver rotates the steering wheel 1 clockwise (seen from the end of the steering wheel 1 to the end of the output shaft 33), the upper part 31 of the input shaft, the lower part 32 of the input shaft and the output shaft 33 rotate clockwise, because the external threads of the output shaft 33 are in clearance fit with the internal threads of the limit nut 101, and the limit nut 101 is in clearance fit with the inner wall of the lower shell 6, the limit nut 101 cannot rotate and can only move axially to the right, when the limit nut 101 moves to the right to a design value, the plane on the right side of the limit nut 101 contacts with the plane of the right limit post 102, and the steering wheel 1 stops rotating clockwise; on the contrary, when the steering wheel 1 is rotated anticlockwise and the limit nut 101 moves leftwards and axially, when the limit nut 101 moves leftwards to a design value, the left plane of the limit nut 101 is contacted with the plane of the left limit post 102, and the steering wheel 1 stops rotating anticlockwise, so that the limit of the rotation angle of the steering wheel 1 is realized.

In a specific embodiment, the load aligning mechanism 5 includes a load motor 51, a worm 52 and a worm gear 53, the output end of the load motor 51 extends into the lower housing 6 and is connected with the worm 52 through a buffer pad, the worm gear 53 is pressed on the output shaft 33, the worm 52 is meshed with the worm gear 53, and the worm 52 and the worm gear 53 are meshed to function as a speed reducer.

When the driver operates the steering wheel 1 clockwise, the steering wheel 1 drives the upper part 31 of the input shaft and the lower part 32 of the input shaft to rotate, the body welded with the lower part 32 of the input shaft rotates, the elastic torsion bar 35 absorbs the part of the rotating torque to generate elastic deformation, the output shaft 33 and the rotor assembled on the output shaft 33 are not subjected to any rotating torque to rotate, at the moment, a certain phase difference (angle difference) is generated between the body of the first sensor 21 and the rotor, the phase difference is converted into a torque electric signal, the controller 4 receives the electric signal, meanwhile, the controller 4 receives wheel information acquired by the second sensor, combines with the state information of the vehicle, after logical operation and analog operation, an instruction is sent to an R-EPS steering actuator executing motor in an external steering actuator, at the same time, the controller 4 transmits a corresponding moment instruction to the load motor 51 through another preset force model, the load motor 51 drives the worm 52 to rotate, the worm 52 drives the worm 53 to rotate, the output shaft 33 to rotate clockwise, a damping effect is generated on the steering wheel 1, and when the steering wheel is released, the angle difference between the body of the first sensor 21 and the rotor is converted into a torque electric signal, the steering wheel is stopped, and the load is stopped, and the steering wheel 1 rotates anticlockwise, and the load is stopped when the steering wheel 1 rotates beyond the position of the original steering wheel is rotated, and the steering wheel 1, and the load is rotated by the rotating the output shaft is not rotates by the steering wheel 1, and the steering wheel 1.

The elastic torsion bar 35 senses the angle change from the steering wheel 1 by means of deformation, the first sensor 21 obtains the rotation torque of the steering wheel 1 by measuring the deformation angle of the elastic torsion bar 35 (according to the principle of material mechanics, in the application range of the system, the torque is in direct proportion to the deformation angle, the detection mode adopts the way of converting the angle into the magnetic field change, the magnetic field change is sensed by a measuring device sensitive to the magnetic field change, and the angle change is calculated, so that the electric signal of the torque is obtained).

In a specific embodiment, the first bearing 36 and the second bearing 37 are disposed on the same side of the worm wheel 53, so that the positioning accuracy of the worm wheel 53 is greatly improved.

In a specific embodiment, the controller 4 is an integrated full-redundancy motor controller, and the first sensor 21 is a torque corner full-redundancy sensor, so that stable, reliable and safe operation of the wire-controlled electric power steering column is ensured.

Vehicle embodiments incorporating the above-described electric power steering column

The vehicle of the embodiment comprises the drive-by-wire electric power steering column, wherein the steering column comprises a steering wheel 1, a sensor assembly 2, a shaft assembly 3, a controller 4 and a load correcting mechanism 5, the steering wheel 1 is fixedly arranged at one end of the shaft assembly 3, the sensor assembly 2 comprises a first sensor 21 which is arranged on the shaft assembly 3 and is used for collecting torque signals and rotation angle signals of the steering wheel 1, and a second sensor which is used for collecting wheel movement state signals, the load correcting mechanism 5 is connected with one end, deviating from the steering wheel 1, of the shaft assembly 3, and the controller 4 is respectively and electrically connected with the sensor assembly 2, the load correcting mechanism 5 and an external steering executing mechanism; during steering, the controller 4 receives signals collected by the sensor assembly 2 and controls the external steering actuating mechanism to implement power-assisted steering after operation, and meanwhile, the controller 4 receives signals collected by the sensor assembly 2 and controls the load correcting mechanism 5 to work after operation, so that a damping effect is achieved on the rotating direction of the steering wheel 1; in the non-steering state, the load return mechanism 5 drives the steering wheel 1 to return.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art, provided that they meet the objectives of the invention, such as: different combinations of specific embodiments, different combinations of distinguishing features.

Claims (10)

1. A drive-by-wire electric power steering column, comprising: steering wheel (1), sensor assembly (2), axle assembly (3), controller (4) and load return mechanism (5), steering wheel (1) fixed mounting is in axle assembly (3) one end, sensor assembly (2) are including installing first sensor (21) that are used for gathering steering wheel (1) moment of torsion signal and rotation angle signal on axle assembly (3) to and be used for gathering the second sensor of wheel motion state signal, load return mechanism (5) are connected with axle assembly (3) one end that deviates from steering wheel (1), controller (4) are respectively with sensor assembly (2), load return mechanism (5) and outside steering actuator electric connection; during steering, the controller (4) receives signals collected by the sensor assembly (2) and controls the external steering actuating mechanism to implement power-assisted steering after operation, and meanwhile, the controller (4) receives signals collected by the sensor assembly (2) and controls the load centering mechanism (5) to work after operation, so that a damping effect is achieved on the rotating direction of the steering wheel (1); when the steering wheel is not turned, the load centering mechanism (5) drives the steering wheel (1) to perform centering.

2. The electric power steering column according to claim 1, characterized in that the shaft assembly (3) comprises an input shaft upper part (31), an input shaft lower part (32), an output shaft (33), a spline shaft (34) and an elastic torsion bar (35), the steering wheel (1) is fixedly installed in the input shaft upper part (31), the input shaft upper part (31) and the input shaft lower part (32) are connected through a spline pair of the spline shaft (34) and coaxially rotate, the input shaft lower part (32) and the output shaft (33) are connected through keys and keyways, the input shaft lower part (32) and the output shaft (33) have a rotation angle, a body and a rotor of the first sensor (21) are installed on the input shaft lower part (32) and the output shaft (33) respectively, one end of the elastic torsion bar (35) is pressed in the input shaft lower part (32) and is in interference fit with the two, the other end of the elastic torsion bar (35) extends into the output shaft (33) and is connected with the output shaft (33) through a pressing pin, the output shaft (33) is connected with the output shaft (33) through a pressing pin, and the first bearing (36) and the lower bearing (6) are axially connected with the first bearing (6) and the lower bearing (37) are axially and the second bearing (6) are installed.

3. A steer-by-wire column according to claim 2, characterized in that the angle of rotation between the lower input shaft part (32) and the output shaft (33) is ± 4.5 °.

4. A steer-by-wire column according to claim 2, characterized in that the stiffness of the elastic torsion bar (35) is 2.0-3N-M/°.

5. The electric power steering column according to claim 2, further comprising a switch assembly (8) and a mounting seat assembly (9), wherein the mounting seat assembly (9) is arranged outside the shaft assembly (3), the shaft assembly (3) and the mounting seat assembly (9) rotate relatively, the switch assembly (8) is mounted at one end, close to the steering wheel (1), of the mounting seat assembly (9), and the lower shell (6) is connected with one end, far away from the steering wheel (1), of the mounting seat assembly (9).

6. A steer-by-wire electric power steering column according to claim 2, characterized in that the output shaft (33) is provided with a limiting mechanism (10) for limiting the rotation angle of the steering wheel (1).

7. The electric power steering column according to claim 6, wherein the limit mechanism (10) comprises a limit nut (101) and two limit posts (102), the limit nut (101) is sleeved on the output shaft (33), the limit nut (101) is in threaded connection with the output shaft (33), the limit nut (101) is axially and slidably connected with the inner wall of the lower housing (6), and the two limit posts (102) are symmetrically distributed on two sides of the sliding direction of the limit nut (101).

8. The electric power steering column according to claim 2, wherein the load return mechanism (5) comprises a load motor (51), a worm (52) and a worm wheel (53), the output end of the load motor (51) extends into the lower housing (6) and is connected with the worm (52) through a buffer pad, the worm wheel (53) is press-fitted on the output shaft (33), and the worm (52) is meshed with the worm wheel (53).

9. The electric power-assisted steering column according to claim 1, characterized in that the controller (4) is an integrated fully redundant motor controller and the first sensor (21) is a torque angle fully redundant sensor.

10. A vehicle comprising the electric power steering column according to any one of claims 1 to 9.