CN115235796A - Unbalanced mass tolerance value test system for shimmy of vehicle steering wheel - Google Patents
Unbalanced mass tolerance value test system for shimmy of vehicle steering wheel Download PDFInfo
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Abstract
The invention discloses a system for testing an unbalanced mass tolerance value of shimmy of a vehicle steering wheel. The method comprises the following steps: the controller is connected with the steering wheel acceleration sensor; the device comprises a steering wheel acceleration sensor, a controller and a controller, wherein the steering wheel acceleration sensor is used for respectively testing the steering wheel acceleration of a steering wheel aiming at each mass block in a test period when the mass blocks with different numerical values are adhered to the appointed position of one front wheel of the vehicle, and transmitting the steering wheel acceleration to the controller; and the controller is used for acquiring a minimum numerical mass block corresponding to the condition that the maximum circumferential vibration acceleration of the steering wheel is greater than or equal to a preset threshold value, and taking the minimum numerical mass block as an unbalanced mass tolerance value corresponding to the shimmy of the steering wheel of the vehicle. The mass blocks are pasted on the appointed positions of the wheels in a concentrated mode, so that the tolerance value of the steering wheel shimmy to the wheel edge unbalance mass can be measured, the tolerance value is used as the stability evaluation index of the steering wheel shimmy of the vehicle, and a basis is provided for the follow-up steering wheel shimmy optimization design and evaluation work of the vehicle.
Description
Technical Field
The invention relates to the technical field of vehicle testing, in particular to a system for testing an unbalanced mass tolerance value of shimmy of a vehicle steering wheel.
Background
Steering wheel shimmy of a vehicle means that the vehicle runs on a flat road in a straight line, the steering wheel generates sensible circumferential vibration, and the circumferential vibration of the steering wheel can be seen when the steering wheel is loosened; with the rapid development of automobiles, people continuously improve the requirements on the riding comfort of the automobiles, and the attention on the vibration problems of steering wheel shimmy and the like is gradually enhanced.
At present, the research direction for steering wheel shimmy is mainly how to identify or evaluate the steering wheel shimmy condition when the vehicle has the shimmy condition, and how to reduce the steering wheel shimmy according to the identification or evaluation result.
However, in the prior art, the research direction for steering wheel shimmy is single, mainly aiming at a vehicle in which steering wheel shimmy has already occurred, and the evaluation of the robustness for normal vehicle steering wheel shimmy is also a problem that needs to be researched urgently.
Disclosure of Invention
The invention provides a system for testing an unbalanced mass tolerance value aiming at shimmy of a steering wheel of a vehicle, which is used for testing and evaluating the unbalanced mass of the shimmy of the steering wheel to the wheel edge.
According to an aspect of the present invention, there is provided an unbalanced mass tolerance test system for vehicle steering wheel shimmy, comprising: the controller is connected with the steering wheel acceleration sensor;
the device comprises a steering wheel acceleration sensor, a controller and a control module, wherein the steering wheel acceleration sensor is used for respectively testing the steering wheel acceleration of a steering wheel aiming at each mass block in a test period when mass blocks with different numerical values are pasted at the appointed position of one front wheel of the vehicle, and transmitting the steering wheel acceleration to the controller, wherein the test period comprises the time from the starting of the vehicle to the appointed running speed;
and the controller is used for acquiring the maximum circumferential vibration acceleration of the steering wheel aiming at each mass block in a test period according to the acceleration of the steering wheel, acquiring the minimum numerical mass block corresponding to the maximum circumferential vibration acceleration of the steering wheel which is greater than or equal to a preset threshold value, and taking the minimum numerical mass block as an unbalanced mass tolerance value corresponding to shimmy of the steering wheel of the vehicle.
According to another aspect of the present invention, there is provided a method for testing an imbalance mass tolerance for vehicle steering wheel shimmy, comprising:
when different numerical value mass blocks are pasted at the appointed position of one front wheel of the vehicle through a steering wheel acceleration sensor, respectively testing the steering wheel acceleration of the steering wheel aiming at each mass block in a testing period, and transmitting the steering wheel acceleration to a controller, wherein the testing period comprises the time from the starting of the vehicle to the appointed running speed;
the controller obtains the maximum circumferential vibration acceleration of the steering wheel aiming at each mass block in a test period according to the acceleration of the steering wheel, obtains the minimum numerical mass block corresponding to the maximum circumferential vibration acceleration of the steering wheel which is more than or equal to a preset threshold value, and takes the minimum numerical mass block as an unbalanced mass tolerance value corresponding to shimmy of the steering wheel of the vehicle.
According to the technical scheme of the embodiment of the invention, the mass block is intensively adhered to the appointed position of the wheel, so that the mass tolerance value of the shimmy of the steering wheel to the wheel rim unbalance can be measured, the mass tolerance value is used as the stability evaluation index of the shimmy of the steering wheel of the vehicle, and a basis is provided for the shimmy optimization design and evaluation work of the steering wheel of the subsequent vehicle.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an unbalanced mass tolerance test system for shimmy of a steering wheel of a vehicle according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an arrangement of a steering wheel acceleration sensor according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of another imbalance mass tolerance test system for vehicle steering wheel shimmy according to a second embodiment of the present invention;
FIG. 4 is a flow chart of a method for testing an imbalance mass tolerance value of vehicle steering wheel shimmy according to a third embodiment of the invention;
fig. 5 is a flowchart of a method for testing an imbalance mass tolerance value of vehicle steering wheel shimmy according to the fourth embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example one
Fig. 1 is a schematic structural diagram of a system for testing an imbalance mass tolerance value of vehicle steering wheel shimmy according to an embodiment of the present invention, where the system includes: a controller 110 and a steering wheel acceleration sensor 120 connected to the controller.
The steering wheel acceleration sensor 120 is configured to, when mass blocks with different numerical values are attached to a specified position of a front wheel of the vehicle, respectively test the steering wheel acceleration of the steering wheel for each mass block in a test period, and transmit the steering wheel acceleration to the controller 110, where the test period includes a period from the start of the vehicle to a specified driving speed; and the controller 110 is configured to obtain a maximum steering wheel circumferential vibration acceleration for each mass in a test period according to the steering wheel acceleration, obtain a minimum numerical mass corresponding to the maximum steering wheel circumferential vibration acceleration being greater than or equal to a preset threshold, and use the minimum numerical mass as an unbalanced mass tolerance corresponding to shimmy of the steering wheel of the vehicle.
Specifically, the steering wheel acceleration sensor is an electronic device capable of measuring acceleration, and can be divided into a piezoelectric acceleration sensor, a piezoresistive acceleration sensor, a capacitive acceleration sensor, and a servo acceleration sensor. The specified position of the wheel can be the wheel rim of the left front wheel or the right front wheel of the vehicle, the wheel rim refers to the outermost circle of the metal part of the vehicle wheel, the mass block can be specifically pasted on the wheel rim of the left front wheel or the wheel rim of the right front wheel, the pasting position of the mass block is not limited in the embodiment, the mass block is pasted on other wheel side rotating parts, or pasted on the inner surfaces of the wheel rim of the left front wheel and the wheel rim of the right front wheel simultaneously, and the protection scope of the application is within the protection scope of the application; the different numerical value mass blocks are used for simulating the condition of wheel edge unbalance by taking the numerical value of the mass block as a variable and changing the numerical value of the mass block, for example, the weight of the mass block is sequentially increased by taking 10g as a unit from 0g, and the corresponding acceleration of the steering wheel under different weights is tested; the specified running speed can be the highest running speed of the vehicle, the test process of one mass block is a test working condition, one test working condition is the process of gradually accelerating the vehicle from starting to the highest running speed, the test is repeated for three times, the test period corresponding to each test is the process of gradually accelerating the vehicle from starting to the highest running speed, and the purpose of testing for three times is to obtain an average value through multiple measurements and ensure the accuracy of the test result.
Illustratively, the weights of the masses are sequentially increased by taking 10g as a unit from 0g, taking the weight of the mass as 10g as an example, the masses are centrally adhered to the inner surface of a left front rim of a vehicle, the steering wheel acceleration sensor 120 measures the steering wheel acceleration corresponding to the mass with the weight of 10g in the process of gradually accelerating the vehicle from the start to the highest running speed three times, the average value of the three measurement results is taken and is transmitted to the controller 110 as the steering wheel acceleration, the controller 110 calculates the maximum steering wheel circumferential vibration acceleration corresponding to the mass with the weight of 10g according to the received steering wheel acceleration, when the maximum steering wheel circumferential vibration acceleration is smaller than a preset threshold, the steering wheel is not subjected to shimmy, at this time, a user can continuously increase the mass by taking 10g as a unit to perform measurement again, the test process is repeated after the weight of the mass is increased each time, and the minimum mass value corresponding to the maximum steering wheel circumferential vibration acceleration is obtained, wherein the maximum steering wheel circumferential vibration acceleration is greater than or equal to the preset threshold; the preset threshold value is manually set according to the maximum steering wheel shimmy acceleration allowed when the shimmy test is carried out on the vehicle. If the steering wheel acceleration sensor 120 detects that the circumferential acceleration of the steering wheel is greater than or equal to a preset acceleration threshold, it can be determined that the steering wheel is in a shimmy state; if the steering wheel acceleration sensor 120 detects that the circumferential acceleration of the steering wheel is smaller than the preset acceleration threshold, it can be determined that the steering wheel is not in a shimmy state; when the maximum circumferential vibration acceleration of the steering wheel is obtained and is larger than or equal to the minimum numerical mass block corresponding to the preset threshold value, the minimum numerical mass block can be used as an unbalanced mass tolerance value corresponding to shimmy of the steering wheel of the vehicle.
Preferably, the system further includes a vehicle speed sensor 130 connected to the controller 110; for obtaining a corresponding target driving speed of the vehicle at the maximum steering wheel circumferential vibration acceleration, and transmitting the target driving speed of the vehicle to the controller 110.
Specifically, the vehicle speed sensor 130 is obtained by directly or indirectly detecting the vehicle running speed; the vehicle speed sensor 130 may be disposed on the vehicle body and connected to the controller, and the type and the disposed position of the vehicle speed sensor 130 are not limited in this embodiment; under a test working condition, the acceleration of a steering wheel of a vehicle is constantly changed in the acceleration process, and the corresponding circumferential vibration acceleration of the steering wheel, which is obtained according to the acceleration of the steering wheel, is also constantly changed.
Preferably, the steering wheel acceleration sensor 120 comprises a first steering wheel acceleration sensor 121 located at a first position of the steering wheel and a second steering wheel acceleration sensor 122 located at a second position of the steering wheel, wherein the first steering wheel acceleration sensor 121 and the second steering wheel acceleration sensor 122 are arranged on the rim of the steering wheel and are arranged at 90 ° with the steering wheel rotation axis as the center in the steering wheel plane.
Fig. 2 is a schematic diagram of a steering wheel acceleration sensor arrangement, where position a is the position of the steering wheel rim 12 point, i.e. position a is taken as the first position, and the first steering wheel acceleration sensor 121 is disposed at position a; the position b is the position of the 3 point of the steering wheel rim, that is, the position b is taken as the second position, the second steering wheel acceleration sensor 122 is disposed at the position b, and the positions a and b are 90 ° centered on the rotation axis of the steering wheel in the plane of the steering wheel, that is, the two steering wheel acceleration sensors are perpendicular to each other, in this embodiment, only the 12 point and 3 point arrangements of the steering wheel acceleration sensors are taken as examples, and other steering wheel acceleration sensor position arrangements can also be adopted, such as 12 point and 9 point positions, 6 point and 3 point positions, and 6 point and 9 point positions, in this embodiment, the first position where the first steering wheel acceleration is located and the second position where the second steering wheel is located are not specifically limited, and all are within the protection scope of this application as long as the positions of the first steering wheel acceleration sensor 121 and the second steering wheel acceleration sensor 122 are perpendicular to each other.
Preferably, a first steering wheel acceleration sensor 121 for testing a first steering wheel acceleration for each mass at a first position of the steering wheel and transmitting the first steering wheel acceleration to the controller; a second steering wheel acceleration sensor 122 for testing a second steering wheel acceleration for each mass at a second position of the steering wheel and transmitting the second steering wheel acceleration to the controller.
Specifically, the first steering wheel acceleration sensor 121 and the second steering wheel acceleration sensor 122 are both connected to the controller 110, and both transmit the measured corresponding steering wheel accelerations obtained by pasting different numerical mass blocks to the controller 110, and record the measured corresponding steering wheel accelerations as a first steering wheel acceleration and a second steering wheel acceleration; for example, taking the case where the weight of the mass attached to the inner surface of the front left rim of the vehicle is 10g, the first steering wheel acceleration sensor 121 located at the steering wheel position a measures the first steering wheel acceleration a corresponding to the mass attached to 10g and transmits the measured first steering wheel acceleration a to the controller 110, and the second steering wheel acceleration sensor 122 located at the steering wheel position B measures the second steering wheel acceleration B corresponding to the mass attached to 10g and transmits the measured second steering wheel acceleration B to the controller 110.
Preferably, the controller 110 is configured to obtain a maximum steering wheel circumferential vibration acceleration for each mass during the test period based on the first steering wheel acceleration and the second steering wheel acceleration.
Specifically, the controller 110 calculates the maximum steering wheel circumferential vibration acceleration of each mass block according to the first steering wheel acceleration and the second steering wheel acceleration, in order to calculate the steering wheel circumferential vibration acceleration through cross validation, as shown in fig. 2, a component of the acceleration a along a tangential line of the steering wheel is Ay, a component of the tangential point a pointing to the center of the steering wheel is Ax, a component of the acceleration B along a tangential line of the steering wheel is Bx, and a component of the tangential point B pointing to the opposite direction of the center of the steering wheel is By. Taking the position a of the first steering wheel acceleration sensor as an example, the component Ay on the position a along the tangent line of the steering wheel not only contains the vibration acceleration in the circumferential direction of the steering wheel, but also contains the translational acceleration in the plane of the steering wheel, so that the signal can not be distinguished as the circumferential vibration acceleration or the translational acceleration of the steering wheel, and a part of the translational acceleration can be easily wrongly judged as the circumferential vibration acceleration; for example, when the steering wheel simultaneously generates circumferential vibration (namely shimmy) and translational vibration along the lateral direction of the whole vehicle, a component Ay at the position a along the tangent line of the steering wheel can be superposed with two components of the circumferential vibration and the translational vibration, if the signal is directly collected, the translational vibration acceleration can be superposed, and the shimmy is misjudged. But the component By pointing to the direction opposite to the center of the steering wheel at the position b only contains translational acceleration, so that translational vibration of the steering wheel along the lateral direction of the whole vehicle can be eliminated By subtracting the By from Ay, and only the circumferential vibration acceleration of the steering wheel is reserved; similarly, the component Bx at the position b along the tangent line of the steering wheel minus the component Ax at the position a pointing to the center direction of the steering wheel can also eliminate the translational vibration of the steering wheel along the longitudinal direction of the plane of the steering wheel, only the circumferential vibration acceleration of the steering wheel is reserved, and then the circumferential vibration acceleration of the steering wheel can be accurately obtained by averaging the two vibration accelerations; superposition of translational acceleration of the steering wheel on circumferential vibration acceleration can be eliminated through cross validation, and the phenomenon that vibration in other directions such as transverse direction, longitudinal direction and the like in a plane of the steering wheel is misjudged as circumferential vibration is avoided; taking a component Ay at a position a along the tangent line of the steering wheel minus a component By at a position b pointing in the opposite direction of the center of the steering wheel as y, namely y = Ay-By, taking a component Bx at a position b along the tangent line of the steering wheel minus a component Ax at a position a pointing in the direction of the center of the steering wheel as x, namely x = Bx-Ax, and taking an average value M of y and x as the acceleration of the vibration in the circumferential direction of the steering wheel, namely M = (y + x)/2; the maximum steering wheel circumferential vibration acceleration can also be obtained by other methods, such as measurement by a steering wheel circumferential vibration angular acceleration sensor.
According to the technical scheme of the embodiment of the invention, the tolerance value of the shimmy of the steering wheel to the wheel side unbalance mass can be measured by intensively pasting the mass blocks at the appointed positions of the wheels, and the tolerance value can be used as an evaluation index of the shimmy stability of the steering wheel of a normal vehicle, so that a basis is provided for the shimmy optimization design and evaluation work of the steering wheel of the follow-up vehicle.
Example two
Fig. 3 is a schematic structural diagram of a system for testing an imbalance mass tolerance value of vehicle steering wheel shimmy according to a second embodiment of the present invention, in which a display device 140 and a storage device 150 are added to the first embodiment.
Preferably, the system further comprises a display device 140 connected to the controller 110; a controller 110 for transmitting the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed, and the unbalance mass tolerance value to the display device 140; and a display device 140 for displaying the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed, and the unbalance mass tolerance value.
Specifically, the controller 110 and the display device 140 are connected by a bus, and when the controller 110 obtains the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed and the unbalanced mass tolerance value, the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed and the unbalanced mass tolerance value are transmitted to the display device 140, the display device 140 may be a liquid crystal display screen, so that a user can timely know related parameter information when the vehicle steering wheel is shimmy, the user refers to a technician designing a vehicle or a related worker, and the user can be used as an evaluation index for evaluating the tolerance and design robustness of the shimmy of the steering wheel to the edgewise unbalanced mass vibration excitation by knowing the maximum steering wheel circumferential vibration acceleration, the target running speed and the unbalanced mass tolerance value of the vehicle, and further provide basis for the optimal design and evaluation of the steering wheel shimmy, for example, when the unbalanced tolerance value is 50g, the shimmy occurs, and at this time, the user can check that the maximum steering wheel circumferential vibration acceleration is 3m/s through the display device 140 2 The corresponding vehicle speed is 30m/s.
Preferably, the system further comprises a storage device 150 connected to the controller; a controller 110 for transmitting the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed, and the unbalance mass tolerance value to the storage device 150; and a storage device 150 for storing the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed, and the unbalance mass tolerance value.
Specifically, the controller 110 and the storage device 150 are connected via a bus, and the storage device 150 refers to a device for storing information, and may be a portable computer disk, a hard disk, a Random Access Memory (RAM), a Read Only Memory (ROM), an erasable programmable read only memory (EPROM or flash memory), an optical fiber, a portable compact disk read only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing; when the controller 110 obtains the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed, and the imbalance mass tolerance value, it is transmitted to the storage device 150 to be stored as history information.
Further, the purpose of storage is to facilitate the user to read when needed subsequently; for example, a user may input a data reading instruction through the display device 140, where the data instruction includes specified data content and a specified time range that the user wants to read, where the specified data content may be one or more of a circumferential vibration acceleration of a steering wheel, a target driving speed of a vehicle, and an imbalance quality tolerance value, the specified time range may be set by the user as needed, the input may be performed by touching a virtual key on the display device 140, when the user touches the virtual key for reading data to input the data reading instruction, the display device 140 may send the data reading instruction to the controller, the controller 110, receiving the data reading instruction, may execute reading information of corresponding data content and time range in the storage device 150, and then feed back the information of corresponding data content and time range to the display device 140 for displaying the user; for example, if the user wants to check the unbalance quality tolerance measured in month 5 2022, after inputting the data reading instruction through the display device 140, the controller 110, receiving the data reading instruction, reads the history information of the unbalance quality tolerance measured in month 5 2022 in the storage device 150, and feeds the history information back to the display device 140 to display the user, and the user can check the unbalance quality tolerance through the display device 140.
According to the technical scheme of the embodiment of the invention, the mass block is intensively pasted at the appointed position of the wheel, so that the tolerance value of the shimmy of the steering wheel to the wheel edge unbalance mass can be measured, the obtained numerical value is displayed to a user through the display device, and is stored through the storage device at the same time to be used as the stability evaluation index of the shimmy of the steering wheel of the vehicle, and a basis is provided for the follow-up shimmy optimization design and evaluation work of the steering wheel of the vehicle.
EXAMPLE III
Fig. 4 is a flowchart of a method for testing an imbalance mass tolerance for shimmy of a steering wheel of a vehicle according to a third embodiment of the present invention, where the method in the third embodiment of the present disclosure specifically includes:
s110, when different numerical value masses are pasted at a specified position of a front wheel of the vehicle through the steering wheel acceleration sensor, the steering wheel acceleration of the steering wheel aiming at each mass in a test period is respectively tested, and the steering wheel acceleration is transmitted to the controller.
Specifically, the weight of the mass block is sequentially increased by taking 10g as a unit from 0g, the corresponding acceleration of the steering wheel under different weights is tested, taking the weight of the mass block as 10g as an example, the mass block is centrally adhered to the inner surface of the left front rim of the vehicle, the steering wheel acceleration sensor 120 measures the acceleration of the steering wheel corresponding to the mass block with the weight of 10g three times respectively, the test period corresponding to each test is specifically the process of gradually accelerating from vehicle starting to the highest driving speed, the purpose of testing three times is to take an average value for multiple measurements, the accuracy of the test result is ensured, and the average value of the three measurement results is taken as the acceleration of the steering wheel and is transmitted to the controller 110.
Furthermore, two steering wheel acceleration sensors are arranged at positions a and B of the steering wheel respectively, the positions a and B are arranged in a steering wheel plane at 90 degrees by taking the rotation axis of the steering wheel as the center, the positions a and B are respectively a first steering wheel acceleration sensor and a second steering wheel acceleration sensor, taking the case that the weight of mass blocks which are centrally pasted on the inner surface of the left front rim of the vehicle is 10g as an example, the first steering wheel acceleration sensor at the position a of the steering wheel can measure the first steering wheel acceleration A corresponding to the mass block pasted with 10g and transmit the first steering wheel acceleration A to the controller, and the second steering wheel acceleration sensor at the position B of the steering wheel can measure the second steering wheel acceleration B corresponding to the mass pasted with 10g and transmit the second steering wheel acceleration B to the controller.
And S120, acquiring the maximum circumferential vibration acceleration of the steering wheel aiming at each mass block in a test period through the controller according to the acceleration of the steering wheel, acquiring the minimum numerical mass block corresponding to the maximum circumferential vibration acceleration of the steering wheel which is greater than or equal to a preset threshold value, and taking the minimum numerical mass block as an unbalanced mass tolerance value corresponding to the shimmy of the steering wheel of the vehicle.
Specifically, the maximum circumferential vibration acceleration of the steering wheel of each mass block can be obtained through a cross validation method, the controller calculates the maximum circumferential vibration acceleration of the steering wheel of each mass block according to the first acceleration of the steering wheel and the second acceleration of the steering wheel, for example, the controller calculates the maximum circumferential vibration acceleration of the steering wheel corresponding to 10g of mass block, when the maximum circumferential vibration acceleration is smaller than a preset threshold value, it is indicated that the steering wheel is not subjected to shimmy, at the moment, a user can continuously increase the mass block by taking 10g as a unit for measurement again, the test process is repeated after the weight of the mass block is increased each time, and the minimum numerical mass block corresponding to the maximum circumferential vibration acceleration of the steering wheel is obtained, wherein the maximum circumferential vibration acceleration of the steering wheel is larger than or equal to the preset threshold value; the preset threshold is manually set according to the maximum steering wheel shimmy acceleration allowed when the shimmy test is carried out on the vehicle.
Illustratively, the preset threshold value is set to be 3m/s manually according to the maximum steering wheel shimmy acceleration allowed when the shimmy test is carried out on the vehicle 2 The maximum steering wheel shimmy acceleration corresponding to the pasted 10g mass block is 2m/s 2 When the mass is smaller than the preset threshold value, the steering wheel shimmy does not occur when a 10g mass block is pasted, and the maximum steering wheel shimmy acceleration corresponding to a 50g mass block is pasted to be 4m/s 2 When the maximum steering wheel shimmy acceleration corresponding to the fact that the mass block of 50g and the mass block of 60g are pasted is larger than the preset threshold value, the minimum numerical mass block, namely 50g, is used as an unbalanced mass tolerance value corresponding to the vehicle steering wheel shimmy.
According to the technical scheme of the embodiment of the invention, the mass block is intensively adhered to the appointed position of the wheel, so that the mass tolerance value of the shimmy of the steering wheel to the wheel rim unbalance can be measured, the mass tolerance value is used as the stability evaluation index of the shimmy of the steering wheel of the vehicle, and a basis is provided for the shimmy optimization design and evaluation work of the steering wheel of the subsequent vehicle.
Example four
Fig. 5 is a flowchart of a method for testing an imbalance mass tolerance value of shimmy of a steering wheel of a vehicle according to a fourth embodiment of the present invention, in which a method flow related to a display device is added on the basis of the third embodiment of the present invention, as shown in fig. 5, specific contents of steps S210 to S220 are substantially the same as those of steps S110 to S120 in the third embodiment, and therefore, no further description is given in this embodiment, and the method according to the fourth embodiment of the present disclosure specifically includes:
s210, when masses with different numerical values are pasted at the appointed position of one front wheel of the vehicle through the steering wheel acceleration sensor, the steering wheel acceleration of the steering wheel aiming at each mass block in a test period is respectively tested, and the steering wheel acceleration is transmitted to the controller.
S220, obtaining the maximum circumferential vibration acceleration of the steering wheel aiming at each mass block in a test period through the controller according to the acceleration of the steering wheel, obtaining the minimum numerical mass block corresponding to the maximum circumferential vibration acceleration of the steering wheel which is larger than or equal to a preset threshold value, and taking the minimum numerical mass block as an unbalanced mass tolerance value corresponding to the shimmy of the steering wheel of the vehicle.
And S230, transmitting the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed and the unbalance mass tolerance value to a display device through the controller.
Specifically, the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed and the unbalanced mass tolerance value when the controller obtains the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed and the unbalanced mass tolerance value are transmitted to the display device, so that a user can know the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed and the unbalanced mass tolerance value when the vehicle steering wheel is subjected to shimmy in time.
And S240, displaying the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed and the unbalance mass tolerance value through a display device.
Specifically, the display device may be a liquid crystal display, and the display device may display the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed, and the unbalanced mass tolerance value transmitted by the controller, for example, a user may know, on the liquid crystal display, related parameter information of the vehicle steering wheel when shimmy occurs, and the related parameter information may be used as an evaluation index for evaluating tolerance and design robustness of shimmy of the steering wheel to edgewise unbalanced mass vibration excitation, so as to provide a basis for steering wheel shimmy optimization design and evaluation work.
Preferably, the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed and the unbalance mass tolerance value are transmitted to the storage device through the controller; the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed, and the unbalance mass tolerance value are stored by the storage device.
Specifically, the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed and the unbalance mass tolerance value are transmitted to the storage device when the controller obtains the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed and the unbalance mass tolerance value, and the storage device can be a portable computer disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device or any suitable combination of the above; when the controller obtains the maximum circumferential vibration acceleration of the steering wheel, the target running speed of the vehicle and the unbalance mass tolerance value, transmitting the maximum circumferential vibration acceleration of the steering wheel, the target running speed of the vehicle and the unbalance mass tolerance value to a storage device to be used as historical information for storage; facilitating the user to read when subsequently needed.
According to the technical scheme of the embodiment of the invention, the mass block is intensively adhered to the appointed position of the wheel, so that the mass tolerance value of the shimmy of the steering wheel to the wheel rim unbalance can be measured, the mass tolerance value is used as the stability evaluation index of the shimmy of the steering wheel of the vehicle, and a basis is provided for the shimmy optimization design and evaluation work of the steering wheel of the subsequent vehicle.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An unbalanced mass tolerance test system for vehicle steering wheel shimmy, comprising: the controller is connected with the steering wheel acceleration sensor;
the steering wheel acceleration sensor is used for respectively testing the steering wheel acceleration of a steering wheel aiming at each mass block in a test period when different numerical value mass blocks are pasted at the appointed position of one front wheel of the vehicle, and transmitting the steering wheel acceleration to the controller, wherein the test period comprises the time from the starting of the vehicle to the appointed running speed;
the controller is used for acquiring the maximum circumferential vibration acceleration of the steering wheel aiming at each mass block in the test period according to the acceleration of the steering wheel, acquiring the minimum numerical mass block corresponding to the maximum circumferential vibration acceleration of the steering wheel which is greater than or equal to a preset threshold value, and taking the minimum numerical mass block as an unbalanced mass tolerance value corresponding to the shimmy of the steering wheel of the vehicle.
2. The system of claim 1, further comprising a vehicle speed sensor connected to the controller;
the vehicle speed sensor is used for testing the corresponding vehicle target running speed when the maximum steering wheel circumferential vibration acceleration is obtained, and transmitting the vehicle target running speed to the controller.
3. The system of claim 1, wherein the steering wheel acceleration sensors comprise a first steering wheel acceleration sensor located at a first position of the steering wheel and a second steering wheel acceleration sensor located at a second position of the steering wheel,
wherein the first steering wheel acceleration sensor and the second steering wheel acceleration sensor are arranged on a steering wheel rim and are arranged at 90 ° in a steering wheel plane centered on a steering wheel rotation axis.
4. The system of claim 3, wherein the first steering wheel acceleration sensor is to test a first steering wheel acceleration for each mass at a first steering wheel position and to transmit the first steering wheel acceleration to the controller;
the second steering wheel acceleration sensor is to test a second steering wheel acceleration for each mass at a second position of the steering wheel and to transmit the second steering wheel acceleration to the controller.
5. The system of claim 4, wherein the controller is configured to obtain a maximum steering wheel circumferential vibration acceleration for each mass during the test period based on the first steering wheel acceleration and the second steering wheel acceleration.
6. The system of claim 2, further comprising a display device connected to the controller;
the controller is used for transmitting the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed and the unbalance mass tolerance value to the display device;
the display device is used for displaying the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed and the unbalance mass tolerance value.
7. The system of claim 1, further comprising a storage device connected to the controller;
the controller is used for transmitting the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed and the unbalance mass tolerance value to the storage device;
the storage device is used for storing the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed and the unbalance mass tolerance value.
8. A method for testing an imbalance mass tolerance value for shimmy of a steering wheel of a vehicle, applied to the system of claims 1 to 7, comprising:
when different numerical value mass blocks are pasted at a specified position of a front wheel of a vehicle through a steering wheel acceleration sensor, respectively testing the steering wheel acceleration of a steering wheel aiming at each mass block in a test period, and transmitting the steering wheel acceleration to the controller, wherein the test period comprises the time from the starting of the vehicle to the specified running speed;
and acquiring the maximum circumferential vibration acceleration of the steering wheel aiming at each mass block in the test period through a controller according to the acceleration of the steering wheel, acquiring a minimum numerical mass block corresponding to the maximum circumferential vibration acceleration of the steering wheel which is greater than or equal to a preset threshold value, and taking the minimum numerical mass block as an unbalanced mass tolerance value corresponding to the shimmy of the steering wheel of the vehicle.
9. The method according to claim 8, wherein the obtaining, by the controller, a maximum steering wheel circumferential vibration acceleration for each mass in the test period according to the steering wheel acceleration, and obtaining a minimum numerical mass corresponding to the maximum steering wheel circumferential vibration acceleration being greater than or equal to a preset threshold, and taking the minimum numerical mass as an imbalance mass tolerance value further comprises:
transmitting the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed and the unbalance mass tolerance value to a display device through a controller;
displaying, by the display device, the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed, and the imbalance mass tolerance value.
10. The method according to claim 8, wherein the obtaining, by the controller, a maximum steering wheel circumferential vibration acceleration for each mass in the test period according to the steering wheel acceleration, and obtaining a minimum numerical mass corresponding to the maximum steering wheel circumferential vibration acceleration being greater than or equal to a preset threshold, and taking the minimum numerical mass as an imbalance mass tolerance value further comprises:
transmitting the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed and the unbalance mass tolerance value to a storage device through a controller;
storing, by the storage device, the maximum steering wheel circumferential vibration acceleration, the vehicle target running speed, and the unbalance mass tolerance value.
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