Steering column dynamic crushing performance testing device and method

Abstract

The present invention provides a device and method for testing the dynamic crushing performance of a steering column, the device comprising a steering column fixing assembly, a collapsible motion assembly, a steering wheel adapter, a steering wheel, a force sensor, a load transfer plate, and a wire displacement sensor; a crushing structure is connected between the steering column fixing assembly and the collapsible motion assembly, and the crushing structure moves axially when the crushing load is reached to achieve the crushing of the steering column; the bottom of the steering wheel adapter is connected to the collapsible motion assembly, and the top of the steering wheel adapter is connected to the steering wheel; the force sensor and the load transfer plate are sequentially installed on the steering wheel adapter from bottom to top; one end of the wire displacement sensor is fixed on the steering wheel adapter, and the other end of the wire displacement sensor is fixed on a non-deformable structure on a vehicle or a steering column. The present invention can solve the technical problem that the prior art cannot well reflect the actual crushing performance of the steering column.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a device and method for testing the dynamic crushing performance of a steering column. Background Art

[0002] With the rapid development of the automobile industry and the continuous improvement of people's living conditions, automobiles have become one of the indispensable means of transportation for people to travel. The steering column is one of the important parts of the automobile, and the steering column needs to be tested for crushing performance during the automobile production process.

[0003] At present, there are generally two methods for testing the crushing performance of steering columns on automobiles. One is to output the displacement and crushing force curve of the crushing mechanism through static compression experiments to characterize the crushing performance of the steering column. In this static crushing method, the loading form and direction of the force are quite different from the load effect of the human body on the column in an actual collision. The second is to impact the steering wheel through the head shape or BODY BLOCK human body module, and collect the head shape acceleration signal or the steering column load to reflect the energy absorption of the steering column. This method cannot reflect the crushing performance of the steering column itself. In actual traffic accidents and collision tests, the steering column is crushed under the inertial impact of the human body, and its crushing characteristics have dynamic characteristics. Different collision acceleration waveforms and different human body characteristics will affect the dynamic crushing performance of the column. The above two methods cannot well reflect the actual crushing performance of the steering column. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a steering column dynamic crushing performance testing device and method to solve the technical problem that the prior art cannot well reflect the actual steering column crushing performance.

[0005] A steering column dynamic crushing performance testing device, comprising: a steering column fixing component, a collapsible motion component, a steering wheel adapter, a steering wheel, a force sensor, a load transfer plate, and a cable displacement sensor;

[0006] A crushing structure is connected between the steering column fixing assembly and the collapsible moving assembly, and the crushing structure moves axially when a crushing load is reached to achieve the crushing of the steering column;

[0007] The bottom of the steering wheel adapter is connected to the collapsible motion assembly, and the top of the steering wheel adapter is connected to the steering wheel;

[0008] The force sensor and the load transfer plate are sequentially mounted on the steering wheel adapter from bottom to top;

[0009] One end of the pull-wire displacement sensor is fixed on the steering wheel adapter, and the other end of the pull-wire displacement sensor is fixed on a non-deformable structure on the vehicle or the steering column.

[0010] In the above-mentioned steering column dynamic crushing performance testing device, a threaded hole is provided at the bottom of the steering wheel adapter, and the bottom of the steering wheel adapter is threadedly connected to the collapsible motion component.

[0011] In the above-mentioned steering column dynamic crushing performance testing device, the top of the steering wheel adapter is connected to the steering wheel by bolts.

[0012] In the above-mentioned steering column dynamic crushing performance testing device, the force sensor and the load transfer plate are connected to the steering wheel adapter through bolts.

[0013] The above-mentioned steering column dynamic crushing performance test device, wherein the steering column dynamic crushing performance test device needs to meet the following conditional formula during testing:

[0014] E dummy <E belt +E airbag +E steerring-column +E others

[0015] Among them, E dummy It represents the energy generated by the inertia of the dummy, E belt The energy of the seat belt restraining the dummy, E airbag Indicates the energy of the airbag to cushion the dummy, E steerring-column The energy absorbed by the steering column during crushing is E others Indicates that the interior absorbs energy.

[0016] A method for testing the dynamic crushing performance of a steering column is applied to the above-mentioned device for testing the dynamic crushing performance of a steering column, and the method comprises:

[0017] The dynamic crushing performance testing device of the steering column is assembled on a slide or a whole vehicle, and the load time history of the force sensor during the collision is measured to obtain the crushing force, and the displacement time history of the wire displacement sensor during the collision is measured to obtain the crushing distance of the steering column;

[0018] The crushing distance of the steering column is taken as the abscissa and the crushing force is taken as the ordinate to obtain the displacement load curve. The integral area of ​​the displacement load curve is the energy absorbed by the crushing of the steering column.

[0019] The rationality of the crushing design of the steering column is judged based on the data collection results.

[0020] In the above-mentioned steering column dynamic crushing performance test method, the step of judging the rationality of the crushing design of the steering column through the data collection results specifically includes:

[0021] Set the design crush distance d0 of the steering column;

[0022] When the measured steering column crush distance is less than a*d0, it is determined that the steering column is difficult to crush and cannot provide the designed crush space. The crush mechanism needs to be adjusted to reduce the crush force value, where a represents the coefficient;

[0023] When the measured steering column crushing distance is greater than a*d0, it is determined that the steering column crushing force is low and the energy absorption is insufficient, and the crushing mechanism needs to be adjusted to increase the crushing force value.

[0024] In the above-mentioned steering column dynamic crushing performance testing method, the value of a is 75-85%.

[0025] The device and method for testing the dynamic crushing performance of a steering column provided by the present invention have a simple structure, strong practicality, and flexible and convenient assembly. They can be installed in a real vehicle assembly environment and can truly measure the crushing displacement and crushing load changes of the steering column in whole vehicle collisions and slide simulations under different working conditions. The present invention can simulate a real collision of a whole vehicle, and can truly reflect the movement posture of a dummy device, the actual crushing amount and crushing force changes of the steering column. In combination with the occupant injury data and the column crushing data, energy analysis and matching can be performed, which is beneficial to reducing injuries to the occupant's head and chest. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the embodiments of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 is a schematic structural diagram of a steering column dynamic crushing performance testing device according to an embodiment of the present invention;

[0028] Figure 2 It is a schematic diagram of the assembly structure of a steering column dynamic crushing performance testing device according to an embodiment of the present invention on a slide or a whole vehicle;

[0029] Figure 3 is an exemplary displacement load curve diagram;

[0030] Figure 4 It is a schematic diagram of an exemplary design crushing distance. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1 and Figure 2 A steering column dynamic crushing performance testing device proposed in one embodiment of the present invention includes: a steering column fixing component 11, a collapsible motion component 12, a steering wheel adapter 13, a steering wheel 14, a force sensor 15, a load transfer plate 16, and a pull-wire displacement sensor 17.

[0033] A crushing structure is connected between the steering column fixing assembly 11 and the collapsible moving assembly 12. When the crushing load is reached, the crushing structure moves axially to achieve the crushing of the steering column.

[0034] The bottom of the steering wheel adapter 13 is connected to the collapsible motion assembly 12, and the top of the steering wheel adapter 13 is connected to the steering wheel 14. Specifically, a threaded hole is provided at the bottom of the steering wheel adapter 13, and the bottom of the steering wheel adapter 13 is threadedly connected to the collapsible motion assembly 12. The top of the steering wheel adapter 13 is connected to the steering wheel 14 via a bolt 18.

[0035] The force sensor 15 and the load transfer plate 16 are sequentially mounted on the steering wheel adapter 13 from bottom to top. Specifically, the force sensor 15 and the load transfer plate 16 are connected to the steering wheel adapter 14 by bolts.

[0036] One end of the pull-wire displacement sensor 17 is fixed to the steering wheel adapter 13 , and the other end of the pull-wire displacement sensor 17 is fixed to a non-deformable structure on the vehicle or the steering column.

[0037] The steering column dynamic crushing performance test device must meet the following conditions during testing:

[0038] E dummy <E belt +E airbag +E steerring-column +E others

[0039] Among them, E dummy It represents the energy generated by the inertia of the dummy, E belt The energy of the seat belt restraining the dummy, E airbagIndicates the energy of the airbag to cushion the dummy, E steerring-column The energy absorbed by the steering column during crushing is E others Indicates that the interior absorbs energy.

[0040] The present invention also provides a method for testing the dynamic crushing performance of a steering column, which is applied to the above-mentioned device for testing the dynamic crushing performance of a steering column. The method comprises steps S101 to S103:

[0041] S101, assemble the steering column dynamic crushing performance testing device on a slide or a whole vehicle, measure the load time history of the force sensor during the collision to obtain the crushing force, and measure the displacement time history of the wire displacement sensor during the collision to obtain the steering column crushing distance.

[0042] S102, using the steering column crushing distance as the abscissa and the crushing force as the ordinate to obtain a displacement load curve, wherein the integral area of ​​the displacement load curve is the energy absorbed by the steering column crushing.

[0043] Among them, an exemplary displacement load curve is as follows Figure 3 As shown, Figure 3 In the figure, the horizontal axis is the steering column crushing distance D, the vertical axis is the crushing force F, and the integral area of ​​the displacement load curve is Figure 3 The area of ​​the shaded part.

[0044] S103, judging the rationality of the crushing design of the steering column based on the data collection results.

[0045] The steps of judging the rationality of the crushing design of the steering column through the data collection results specifically include:

[0046] Set the design crush distance d0 of the steering column;

[0047] When the measured steering column crushing distance is less than a*d0, it is determined that the steering column is difficult to crush and cannot provide the designed crushing space. The crushing mechanism needs to be adjusted to reduce the crushing force value, wherein a represents a coefficient. Preferably, the value of a is 75-85%.

[0048] When the measured steering column crushing distance is greater than a*d0, it is determined that the steering column crushing force is low and the energy absorption is insufficient, and the crushing mechanism needs to be adjusted to increase the crushing force value.

[0049] An exemplary design crush distance d0 is as follows: Figure 4 As shown, Figure 4When the steering column is measured to be at the d1 position (the crush distance is less than a*d0), it indicates that the crush force of the steering column is designed too high, the column is difficult to crush and cannot provide the designed crush space, and the crush mechanism needs to be adjusted to reduce the crush force value; when the steering column is measured to be at the d2 position (the crush distance is greater than a*d0), it indicates that the crush force of the steering column is low, the energy absorption is insufficient, and the crush mechanism needs to be adjusted to increase the crush force value.

[0050] In summary, the steering column dynamic crushing performance testing device and method provided by the present invention have a simple structure, strong practicality, flexible and convenient assembly, can be installed in a real vehicle assembly environment, and can truly measure the crushing displacement and crushing load changes of the steering column in the whole vehicle collision and slide simulation under different working conditions. The present invention can simulate the real collision of the whole vehicle, can truly reflect the movement posture of the dummy equipment, the actual crushing amount and crushing force changes of the steering column, and can perform energy analysis and matching in combination with the occupant injury data and the column crush data, which is beneficial to reduce the injuries to the occupant's head and chest.

[0051] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit specifically used for a logic gate circuit that implements a logic function for a data signal, a dedicated integrated circuit with a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0053] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for testing the dynamic crushing performance of a steering column, characterized in that: The invention is applied to a steering column dynamic crushing performance test device, which comprises: a steering column fixing component, a collapsible motion component, a steering wheel adapter, a steering wheel, a force sensor, a load transfer plate, and a cable displacement sensor; a crushing structure is connected between the steering column fixing component and the collapsible motion component, and the crushing structure moves axially when the crushing load is reached to realize the crushing of the steering column; the bottom of the steering wheel adapter is connected to the collapsible motion component, and the top of the steering wheel adapter is connected to the steering wheel; the force sensor and the load transfer plate are connected to the steering column fixing component and the collapsible motion component, respectively. The plates are sequentially installed on the steering wheel adapter from bottom to top; one end of the pull-wire displacement sensor is fixed on the steering wheel adapter, and the other end of the pull-wire displacement sensor is fixed on a non-deformable structure on a vehicle or a steering column; a threaded hole is provided at the bottom of the steering wheel adapter, and the bottom of the steering wheel adapter is threadedly connected to the collapsible motion component; the top of the steering wheel adapter is connected to the steering wheel by bolts; the force sensor and the load transfer plate are connected to the steering wheel adapter by bolts; the steering column dynamic crushing performance test device must meet the following conditions during testing: E dummy <E belt +E airbag +E steerring-column +E others ; Among them, E dummy It represents the energy generated by the inertia of the dummy, E belt The energy of the seat belt restraining the dummy, E airbag Indicates the energy of the airbag to cushion the dummy, E steerring-column The energy absorbed by the steering column during crushing is E others It means that the interior absorbs energy; The method comprises: The dynamic crushing performance testing device of the steering column is assembled on a slide or a whole vehicle, and the load time history of the force sensor during the collision is measured to obtain the crushing force, and the displacement time history of the wire displacement sensor during the collision is measured to obtain the crushing distance of the steering column; The crushing distance of the steering column is taken as the abscissa and the crushing force is taken as the ordinate to obtain the displacement load curve. The integral area of ​​the displacement load curve is the energy absorbed by the crushing of the steering column. The rationality of the crush design of the steering column is judged through the data collection results; The steps for judging the rationality of the crush design of the steering column based on the data collection results specifically include: Set the design crush distance d0 of the steering column; When the measured steering column crush distance is less than a*d0, it is determined that the steering column is difficult to crush and cannot provide the designed crush space. The crush mechanism needs to be adjusted to reduce the crush force value, where a represents the coefficient; When the measured steering column crushing distance is greater than a*d0, it is determined that the steering column crushing force is low and the energy absorption is insufficient, and the crushing mechanism needs to be adjusted to increase the crushing force value.

2. The method for testing the dynamic crush performance of a steering column according to claim 1, characterized in that: The value of a is 75% to 85%.

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