An adaptive stiffness real-time adjustment power steering gear

Abstract

The application relates to a self-adaptive stiffness real-time adjusting power steering gear, belonging to the technical field of automobile steering system parts, which comprises a steering gear body, a stiffness adjusting module, the stiffness adjusting module comprises a mounting piece arranged on the shell assembly and used for connecting the auxiliary frame, and a magnetorheological elastomer component and an electromagnetic induction coil are arranged between the mounting piece and the shell assembly. Therefore, during vehicle driving, the current size input by the electromagnetic induction coil is changed, the magnetic field generated after the electromagnetic induction coil is electrified changes, the stiffness intensity of the magnetorheological elastomer component changes under the action of the magnetic field, the vibration energy transmitted to the steering gear body by the auxiliary frame changes, the stiffness of the steering system can be changed for different road conditions, the driving experience difference of the driver is improved, the diversified demand of the driver for the stiffness of the steering system is met, and the whole vehicle NVH performance is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of automobile steering system components, in particular to a self-adaptive stiffness real-time adjusting power steering gear. BACKGROUND

[0002] The steering gear is the most important component in the automobile steering system. The rack and pinion steering gear is mainly used in passenger cars and light trucks. Different configurations and loads of vehicles have different requirements for the stiffness of the steering system.

[0003] In the related art, a patent number CN208682906U discloses a stiffness-adjustable steering gear assembly, which adjusts the stiffness of the shell by loosening the bolts, moving the left and right load rods to a specific position, and then tightening the bolts. The adjustment method can only adjust the stiffness of the shell within a small range, and the adjustment method has less effect on the stiffness of the entire steering gear assembly and even the steering system after the steering gear is installed. In particular, for the power steering gear, due to the larger mass of the power steering gear, the stiffness change effect is not obvious according to the prior art implementation.

[0004] Meanwhile, the adjustment method cannot accurately adjust the stiffness of the entire steering system in real time. For vehicles with different configurations and loads, dynamic calibration experiments need to be performed respectively to determine the appropriate stiffness, which is less economical and not practical in the vehicle development process. Moreover, the steering system has only one stiffness after installation, and the vibration energy transmitted by the subframe to the steering wheel connected to the steering gear is intensified under the excitation of different road surfaces (such as steel cable roads, deceleration belt roads, and stone roads), which leads to poor driving experience of the driver, i.e., the diversified needs of the driver for the stiffness of the steering system cannot be met, and the overall vehicle NVH performance is poor under various working conditions. SUMMARY

[0005] The embodiments of the application provide a self-adaptive stiffness real-time adjusting power steering gear to solve the problem that the steering system of the vehicle steering gear has only one stiffness after installation, the vibration energy transmitted by the subframe to the steering wheel connected to the steering gear is intensified under the excitation of different road surfaces, which leads to poor driving experience of the driver, i.e., the diversified needs of the driver for the stiffness of the steering system cannot be met, and the overall vehicle NVH performance is poor under various working conditions.

[0006] The embodiments of the application provide a self-adaptive stiffness real-time adjusting power steering gear, which comprises:

[0007] The steering gear body comprises a shell assembly;

[0008] A stiffness adjustment module comprising a mount arranged on the housing assembly and configured to connect the subframe, a magneto-rheological elastomer member arranged between the mount and the housing assembly, and an electromagnetic induction coil arranged between the mount and the housing assembly, the electromagnetic induction coil generating a magnetic field and changing the stiffness of the magneto-rheological elastomer member to adjust the vibration energy transmitted by the subframe to the steering gear body.

[0009] In some embodiments, the mount comprises two coaxially symmetrically arranged mounting bushings, the magneto-rheological elastomer member comprises a columnar magneto-rheological elastomer arranged between the two mounting bushings, and the electromagnetic induction coil is arranged around the outer periphery of the columnar magneto-rheological elastomer.

[0010] In some embodiments, the magneto-rheological elastomer member further comprises an annular magneto-rheological elastomer arranged between the mounting bushings and the housing assembly, and the annular magneto-rheological elastomer is arranged at both ends of the electromagnetic induction coil.

[0011] In some embodiments, the mounting bushing comprises a mounting section arranged outside the housing assembly and a connecting section connected to the mounting section and arranged inside the housing assembly, and the annular magneto-rheological elastomer is arranged between the connecting section and the housing assembly.

[0012] In some embodiments, a support sleeve is arranged between the electromagnetic induction coil and the columnar magneto-rheological elastomer to support the annular magneto-rheological elastomers on both sides, and an annular permanent magnet is arranged between the electromagnetic induction coil and the housing assembly.

[0013] In some embodiments, a controller electrically connected to the electromagnetic induction coil and an information acquisition module electrically connected to the controller are further included, the information acquisition module transmits road surface information to the controller, and the controller outputs a control signal to the electromagnetic induction coil to make the electromagnetic induction coil generate a magnetic field and change the stiffness of the magneto-rheological elastomer member.

[0014] In some embodiments, the information acquisition module comprises an acceleration sensor electrically connected to the controller, and the acceleration sensor is configured to acquire acceleration data of the vehicle.

[0015] In some embodiments, the information acquisition module further comprises a lidar and a camera electrically connected to the controller, the lidar is configured to acquire road surface data, and the camera is configured to acquire image data.

[0016] In some embodiments, the information acquisition module further comprises a displacement sensor electrically connected to the controller, and the displacement sensor is configured to measure the distance from the vehicle to the road surface.

[0017] In some embodiments, the controller switches the driving mode of the vehicle through the control signal.

[0018] The technical scheme provided by the application has the beneficial effects of:

[0019] The adaptive stiffness real-time adjusting power steering gear provided by the embodiment of the application, since the stiffness adjusting module comprises the mounting piece arranged on the shell assembly and used for connecting the subframe, the magneto-rheological elastomer component and the electromagnetic induction coil are arranged between the mounting piece and the shell assembly, the electromagnetic induction coil generates a magnetic field and changes the stiffness of the magneto-rheological elastomer component to adjust the vibration energy transmitted by the subframe to the steering gear body.

[0020] Therefore, during the driving of the vehicle, by changing the current input by the electromagnetic induction coil, the magnetic field generated by the electromagnetic induction coil after being powered changes, the ferromagnetic particles in the magneto-rheological elastomer component are magnetized under the action of the magnetic field, according to the different magnetization degrees, the stiffness intensity of the magneto-rheological elastomer component also changes, and the vibration energy transmitted by the subframe to the steering gear body changes, that is, the stiffness of the steering system can be changed according to different road conditions, so as to improve the driving experience of the driver, meet the diversified needs of the driver for the stiffness of the steering system, and improve the NVH performance of the vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiment of the application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0022] Figure 1 The structure schematic view of the embodiment of the application;

[0023] Figure 2 The structure schematic view of the stiffness adjusting module of the embodiment of the application;

[0024] Figure 3 The broken line graph of the elastic modulus of the magneto-rheological elastomer component of the embodiment of the application changing with the magnetic induction intensity of the magnetic field of the electromagnetic induction coil;

[0025] Figure 4 The vibration test graph of the vehicle steering wheel in the X direction of the embodiment of the application;

[0026] Figure 5 The vibration test graph of the vehicle steering wheel in the Y direction of the embodiment of the application;

[0027] Figure 6 The vibration test graph of the vehicle steering wheel in the Z direction of the embodiment of the application.

[0028] The components represented by the reference numerals in the drawings are listed as follows:

[0029] 1, housing assembly; 2, stiffness adjustment module; 3, electromagnetic induction coil; 4, mounting bushing; 41, mounting section; 42, connecting section; 5, columnar magneto-rheological elastomer; 6, annular magneto-rheological elastomer; 7, support sleeve; 8, annular permanent magnet. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and superiorities of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, any other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0031] The adaptive stiffness real-time adjustment power steering gear provided by the embodiments of the present application can solve the problem that in the related art, the steering system of a vehicle has only one stiffness after the vehicle steering gear is installed, and the vibration energy transmitted by the subframe to the steering wheel connected to the steering gear is intensified for different road excitation, resulting in poor driving experience of the driver, i.e., the diversified demand of the driver for the stiffness of the steering system cannot be met, and the overall vehicle NVH performance is poor in comprehensive evaluation of various working conditions.

[0032] Referring to Figures 1 to 3 The adaptive stiffness real-time adjustment power steering gear provided by the embodiments of the present application includes:

[0033] The steering gear body includes a housing assembly 1.

[0034] The stiffness adjustment module 2 includes a mounting member arranged on the housing assembly 1 and used for connecting the subframe, a magneto-rheological elastomer member and an electromagnetic induction coil 3 are arranged between the mounting member and the housing assembly 1, the electromagnetic induction coil 3 generates a magnetic field and changes the stiffness of the magneto-rheological elastomer member to adjust the vibration energy transmitted by the subframe to the steering gear body.

[0035] The number of the stiffness adjustment module 2 of the adaptive stiffness real-time adjustment power steering gear is preferably two, and the stiffness adjustment module 2 is arranged at the positions of the two ends of the housing assembly 1 of the steering gear body, the mounting member is mounted to the subframe of the vehicle through a fastener, and the electromagnetic induction coil 3 can be connected to an external adjustable direct current.

[0036] When the vehicle is running, for different road surfaces, the current input by the electromagnetic induction coil 3 can be changed to change the magnetic field generated by the electromagnetic induction coil 3 after being powered on. Under the action of the magnetic field, the ferromagnetic particles in the magneto-rheological elastomer component are magnetized. According to the different magnetization degrees, the rigidity of the magneto-rheological elastomer component also changes, that is, the elastic modulus of the magneto-rheological elastomer component changes, and the vibration energy transmitted by the subframe to the steering gear body also changes. That is, the rigidity of the steering system can be changed according to different road conditions to improve the driving experience of the driver, meet the diversified needs of the driver for the rigidity of the steering system, and improve the NVH performance of the whole vehicle.

[0037] That is, when the road surface is rough and the road flatness is low, the current input by the electromagnetic induction coil 3 can be increased to increase the magnetic induction intensity of the magnetic field generated by the electromagnetic induction coil 3 after being powered on, so as to increase the elastic modulus of the magneto-rheological elastomer component in the magnetic field. The rigidity of the magneto-rheological elastomer component decreases, so that the rigidity of the vehicle steering system decreases, and the vibration energy transmitted by the subframe to the steering gear body decreases. The driver can avoid the discomfort caused by the vibration of the steering wheel. When the road condition is good and the road flatness is high, the current input by the electromagnetic induction coil 3 can be reduced to reduce the magnetic induction intensity of the magnetic field generated by the electromagnetic induction coil 3 after being powered on, so as to reduce the elastic modulus of the magneto-rheological elastomer component in the magnetic field. The rigidity of the magneto-rheological elastomer component increases, so that the rigidity of the vehicle steering system increases, and the vibration energy transmitted by the subframe to the steering gear body increases. The road feeling brought by the vibration feedback of the steering wheel is more real, so as to improve the operation feeling of the driver when holding the steering wheel to drive.

[0038] It should be noted that, Figure 3 is a broken line graph of the change of the elastic modulus of the magneto-rheological elastomer component with the magnetic induction intensity of the magnetic field of the electromagnetic induction coil 3. As shown in Figure 3 , the abscissa is the magnetic induction intensity, and the ordinate is the elastic modulus. It can be known that the elastic modulus of the magneto-rheological elastomer component increases with the increase of the magnetic induction intensity of the magnetic field of the electromagnetic induction coil 3.

[0039] In some optional embodiments: as shown in Figures 1 to 3 , the embodiment of the application provides a self-adaptive rigidity real-time adjusting power steering gear. The mounting part of the self-adaptive rigidity real-time adjusting power steering gear comprises two coaxially symmetrical mounting bushings 4. The magneto-rheological elastomer component comprises a columnar magneto-rheological elastomer 5 located between the two mounting bushings 4, and the electromagnetic induction coil 3 is wrapped around the outer periphery of the columnar magneto-rheological elastomer 5.

[0040] The adaptive stiffness real-time adjusting power steering gear of the embodiment of the present application comprises two coaxially symmetrical mounting bushings 4, and the axial line of the mounting bushing 4 is perpendicular to the axial line of the shell assembly 1. When the steering gear body is mounted, the mounting bushing 4 is connected with the subframe, the cylindrical magneto-rheological elastomer 5 is abutted between the two mounting bushings 4, and the magnetic field of the electromagnetic induction coil 3 on the outer periphery of the cylindrical magneto-rheological elastomer 5 acts on the ferromagnetic particles in the cylindrical magneto-rheological elastomer 5, thereby enhancing the elasticity of the magneto-rheological elastomer, so that the better buffering effect can be achieved in the vertical direction, so as to reduce the vibration energy transmitted to the steering gear body due to the vertical vibration of the subframe.

[0041] In some optional embodiments, referring to Figures 1 to 3 The embodiment of the present application provides a kind of adaptive stiffness real-time adjusting power steering gear, and the magneto-rheological elastomer component of the adaptive stiffness real-time adjusting power steering gear further includes annular magneto-rheological elastomer 6 between mounting bushing 4 and shell assembly 1, annular magneto-rheological elastomer 6 is located at the two ends of electromagnetic induction coil 3.

[0042] The annular magneto-rheological elastomer 6 of the adaptive stiffness real-time adjusting power steering gear of the embodiment of the present application is abutted between the mounting bushing 4 and the shell assembly 1, and the magnetic field of the electromagnetic induction coil 3 at the end of the annular magneto-rheological elastomer 6 acts on the ferromagnetic particles in the annular magneto-rheological elastomer 6, thereby enhancing the elasticity of the magneto-rheological elastomer, so that the better buffering effect can be achieved in the horizontal circumferential direction, so as to reduce the vibration energy transmitted to the steering gear body due to the horizontal vibration of the subframe.

[0043] It should be noted that through the cooperation of the cylindrical magneto-rheological elastomer 5 and the annular magneto-rheological elastomer 6, the stiffness adjusting module 2 can adjust the vibration energy transmitted to the steering gear body due to the horizontal vibration of the subframe in the XYZ three directions of the whole vehicle.

[0044] In some optional embodiments, referring to Figures 1 to 3 The embodiment of the present application provides a kind of adaptive stiffness real-time adjusting power steering gear, and the mounting bushing 4 of the adaptive stiffness real-time adjusting power steering gear comprises mounting section 41 located outside shell assembly 1 and connecting section 42 connected with mounting section 41 and located inside shell assembly 1, and annular magneto-rheological elastomer 6 is located between connecting section 42 and shell assembly 1.

[0045] The mounting bushing 4 of the adaptive stiffness real-time adjusting power steering gear of the embodiment of the present application comprises connecting section 42 and mounting section 41, the mounting section 41 is provided with threaded hole, the connecting section 42 is provided with through hole communicating with threaded hole, and the connecting section 42 is T-shaped, which is convenient for inserting into shell assembly 1 for mounting.

[0046] In some optional embodiments, referring to Figures 1 to 3As shown, the adaptive stiffness real-time adjusting power steering gear provided by the embodiment of the present application has a support sleeve 7 for supporting the annular magnetorheological elastomer 6 on both sides between the electromagnetic induction coil 3 and the columnar magnetorheological elastomer 5, and an annular permanent magnet 8 is arranged between the electromagnetic induction coil 3 and the shell assembly 1.

[0047] The annular permanent magnet 8 is arranged between the electromagnetic induction coil 3 and the shell assembly 1 of the adaptive stiffness real-time adjusting power steering gear provided by the embodiment of the present application, and in a specific implementation, the direction of the magnetic field of the electromagnetic induction coil 3 can be changed by changing the direction of the current in the electromagnetic induction coil 3, so that the magnetic field of the electromagnetic induction coil 3 can be positively or inversely superimposed with the magnetic field generated by the permanent magnet, further enhancing or weakening the magnetic field generated by the permanent magnet, so that the magnetic induction intensity of the magnetic field in which the magnetorheological elastomer component is located can be adjusted in a larger range, the rigidity adjustment range of the magnetorheological elastomer component is larger, and further the rigidity adjustment range of the steering system is larger, thereby further meeting the diversified needs of the driver for the rigidity of the steering system.

[0048] In some optional embodiments, referring to Figures 1 to 3 As shown, the adaptive stiffness real-time adjusting power steering gear provided by the embodiment of the present application further includes a controller electrically connected with the electromagnetic induction coil 3 and an information acquisition module electrically connected with the controller, the information acquisition module transmits the road surface information to the controller, and the controller outputs a control signal to the electromagnetic induction coil 3 to make the electromagnetic induction coil 3 generate a magnetic field and change the rigidity of the magnetorheological elastomer component.

[0049] The signal acquisition module of the adaptive stiffness real-time adjusting power steering gear provided by the embodiment of the present application can acquire the road surface information and transmit it to the controller, the controller can be a vehicle ECU, the vehicle ECU outputs a control signal to the electromagnetic induction coil 3 after receiving the road surface information, the control signal is an instruction current, the electromagnetic induction coil 3 generates a magnetic field and changes the rigidity of the magnetorheological elastomer component after being electrified, and further changes the rigidity of the steering system.

[0050] It should be noted that the different road surface information can be corresponded to different road flatness levels by a prior simulation method, different instruction currents are called by different road flatness levels, the magnetic induction intensity of the magnetic field generated by the electromagnetic induction coil 3 after being electrified is changed, thereby the rigidity of the magnetorheological elastomer component is changed, and the adjustment of the rigidity of the steering system is realized.

[0051] It should be noted that a current drive module can be integrated on the vehicle ECU controller. The ECU controller uses the current drive module to control the magnitude of the current flowing through the electromagnetic induction coil 3. The current drive module includes a current amplifier and a current driver. The current amplifier can adjust the current and the current driver can stably output the current to the electromagnetic induction coil 3.

[0052] In some alternative embodiments: see Figures 1 to 3 As shown in the figure, this application embodiment provides an adaptive stiffness real-time adjustable power steering system. The information acquisition module of the adaptive stiffness real-time adjustable power steering system includes an acceleration sensor electrically connected to the controller. The acceleration sensor is used to acquire vehicle acceleration data.

[0053] The information acquisition module of the adaptive stiffness real-time adjustment power steering system in this embodiment includes an acceleration sensor. By installing the acceleration sensor on the vehicle, acceleration signals of the entire vehicle in the XYZ directions can be collected during vehicle driving. By testing the vehicle's operation on roads with varying road smoothness, different acceleration signals are correlated with different road smoothness levels. Then, different command currents are invoked based on different road smoothness levels, thereby changing the magnetic induction intensity of the magnetic field after the electromagnetic induction coil 3 is energized, thus altering the stiffness of the magnetorheological elastic component and achieving adjustment of the steering system stiffness. Alternatively, the acceleration signal, command current, and magnetic induction intensity can be directly correlated.

[0054] This means that there is a specific relationship between acceleration, command current, and magnetic induction intensity, and this relationship can be calibrated. During the vehicle development process, the correspondence between these factors can be determined through adjustments. This allows the driver to receive more responsive steering performance and a more realistic road feel under different operating conditions.

[0055] In some alternative embodiments: see Figures 1 to 3 As shown in the figure, this application embodiment provides an adaptive stiffness real-time adjustable power steering system. The information acquisition module of the adaptive stiffness real-time adjustable power steering system also includes a lidar and a camera electrically connected to the controller. The lidar is used to acquire road surface data, and the camera is used to acquire image data.

[0056] The controller of the adaptive stiffness real-time adjustment power steering system in this embodiment acquires road surface data from a lidar and image data from a camera. It then obtains a road surface reference line from the lidar road surface data and compares the road surface reference line with the image data from the camera to determine the road surface smoothness. Specifically, the smoothness can be divided into three levels from high to low. Different command currents are invoked based on different levels of road surface smoothness, thereby changing the magnetic induction intensity of the magnetic field after the electromagnetic induction coil 3 is energized, thus changing the stiffness of the magnetorheological elastomer component and achieving the adjustment of the steering system stiffness.

[0057] In some optional embodiments, referring to Figures 1 to 3 The adaptive stiffness real-time adjusting power steering gear provided by the embodiments of the present application further comprises a displacement sensor electrically connected to the controller, and the displacement sensor is used to measure the distance from the vehicle to the road surface.

[0058] The displacement sensor of the adaptive stiffness real-time adjusting power steering gear provided by the embodiments of the present application can be a laser displacement sensor. By arranging a plurality of laser displacement sensors on the bottom of the vehicle along the length direction of the vehicle, the distance from the vehicle to the road surface can be measured by the laser displacement sensor, and then the flatness in the local range of the road surface can be obtained. The flatness is divided into grades, and different instruction currents are called according to the flatness of the road surface in different grades, so as to change the magnetic induction intensity of the magnetic field of the electromagnetic induction coil 3 after being electrified, thereby changing the stiffness of the magneto-rheological elastomer component, so as to realize the adjustment of the stiffness of the steering system.

[0059] In some optional embodiments, referring to Figures 1 to 3 The adaptive stiffness real-time adjusting power steering gear provided by the embodiments of the present application further comprises a displacement sensor electrically connected to the controller, and the displacement sensor is used to measure the distance from the vehicle to the road surface.

[0060] The control signal of the adaptive stiffness real-time adjusting power steering gear provided by the embodiments of the present application is an instruction current. By setting a current threshold, the current threshold can be calibrated in combination with the actual vehicle. The controller compares the instruction current with the current threshold. Specifically, when the instruction current is equal to the current threshold, the controller automatically switches the driving mode of the vehicle to the sport mode; and when the instruction current is less than the current threshold, the controller automatically switches the driving mode of the vehicle to the comfort mode.

[0061] The adaptive stiffness real-time adjusting steering gear provided by the present application can meet the diversified demand of the driver for the stiffness of the steering system under different road surface excitations, and automatically adjust the stiffness of the steering system in a wider range.

[0062] The magneto-rheological elastomer used in the present application precisely adjusts the stiffness of the steering system in the response time domain of milliseconds, and even without relying on air suspension or electromagnetic suspension, a good driving experience can be brought.

[0063] The response to different road surface excitations can effectively avoid the discomfort of the driver caused by the vibration of the steering wheel under specific working conditions due to the single stiffness of the steering gear at the present stage. The steering wheel vibration test results of the steering gear and the subframe respectively adopting rigid connection and flexible connection on a certain vehicle model are shown in Figures 4 to 6 , Figure 4 The vibration test graph of the vehicle steering wheel in the X direction is shown in Figure 5A vibration test graph of a vehicle steering wheel in the Y direction, Figure 6 A vibration test graph of a vehicle steering wheel in the Z direction, in which A represents a case where a rigid connection is adopted between a steering gear and a subframe, and in which B represents a case where a flexible connection is adopted between the steering gear and the subframe, the horizontal axis represents a vibration frequency in Hz, and the vertical axis represents a vibration acceleration in g, 1 g being equal to 9.8 m / s 2 ;

[0064] The test condition is that the vehicle driving speed is kept at 60 km / h and uniformly driven on a rough road, and the broken line fluctuation of the vibration acceleration is large at 5 Hz to 100 Hz, which represents that the vibration feeling of the vehicle steering wheel is obvious. The maximum vibration accelerations of the vehicle steering wheel in three directions in the range of 5 Hz to 100 Hz are superimposed and calculated, the calculation method is that the vibration accelerations in three directions are squared and then added, and the square root of the sum value is taken, and then the corresponding flexible connection is 0.31 g, and the corresponding rigid connection is 0.35 g, so it can be seen that the vibration feeling of the vehicle steering wheel in the flexible connection is smaller than that in the rigid connection.

[0065] The scheme of automatically triggering driving mode switching by judging the size of the instruction current given in the application does not need the driver to manually switch the power mode again, and is more safe and advanced compared with the existing driving mode switching logic.

[0066] In the description of the present application, it should be noted that the positions or position relationships indicated by the terms "upper", "lower", etc. are based on the positions or position relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0067] It should be noted that, in the present application, the relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0068] The foregoing is merely illustrative of the principles of the application and various modifications can be made by those skilled in the art without departing from the spirit and scope of the application. The above embodiments are illustrative, and not restrictive, of the scope of the application.

Claims

1. An adaptive stiffness real-time adjustable power steering system, characterized in that, include: Steering body, which includes housing assembly (1); The stiffness adjustment module (2) includes a mounting component disposed on the housing assembly (1) and used to connect the subframe. A magnetorheological elastomer component and an electromagnetic induction coil (3) are disposed between the mounting component and the housing assembly (1). The electromagnetic induction coil (3) generates a magnetic field and changes the stiffness of the magnetorheological elastomer component to adjust the vibration energy transmitted from the subframe to the steering gear body. The mounting component includes two mounting bushings (4) arranged coaxially and symmetrically. The magnetorheological elastomer component includes a columnar magnetorheological elastomer (5) located between the two mounting bushings (4). The electromagnetic induction coil (3) surrounds the outer periphery of the columnar magnetorheological elastomer (5). The magnetorheological elastomer component further includes an annular magnetorheological elastomer (6) located between the mounting bushing (4) and the housing assembly (1), the annular magnetorheological elastomer (6) being located at both ends of the electromagnetic induction coil (3); The mounting bushing (4) includes a mounting section (41) located outside the housing assembly (1) and a connecting section (42) connected to the mounting section (41) and located inside the housing assembly (1), with the annular magnetorheological elastomer (6) located between the connecting section (42) and the housing assembly (1). There is a support sleeve (7) between the electromagnetic induction coil (3) and the columnar magnetorheological elastomer (5) for supporting the annular magnetorheological elastomers (6) on both sides.

2. The adaptive stiffness real-time adjustable power steering system as described in claim 1, characterized in that: An annular permanent magnet (8) is provided between the electromagnetic induction coil (3) and the housing assembly (1).

3. The adaptive stiffness real-time adjustable power steering system as described in claim 1, characterized in that: It also includes a controller electrically connected to the electromagnetic induction coil (3) and an information acquisition module electrically connected to the controller. The information acquisition module transmits road surface information to the controller, and the controller outputs a control signal to the electromagnetic induction coil (3) to make the electromagnetic induction coil (3) generate a magnetic field and change the stiffness of the magnetorheological elastomer component.

4. The adaptive stiffness real-time adjustable power steering system as described in claim 3, characterized in that: The information acquisition module includes an acceleration sensor electrically connected to the controller, which is used to acquire vehicle acceleration data.

5. The adaptive stiffness real-time adjustable power steering system as described in claim 3, characterized in that: The information acquisition module also includes a lidar and a camera electrically connected to the controller. The lidar is used to acquire road surface data, and the camera is used to acquire image data.

6. The adaptive stiffness real-time adjustable power steering system as described in claim 3, characterized in that: The information acquisition module also includes a displacement sensor electrically connected to the controller, which is used to measure the distance from the vehicle to the road surface.

7. The adaptive stiffness real-time adjustable power steering system as described in claim 3, characterized in that: The controller switches the vehicle's driving mode via the control signal.

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