CN112414650A

CN112414650A - Automobile seat hardness in-loop test equipment and test method

Info

Publication number: CN112414650A
Application number: CN202011337794.2A
Authority: CN
Inventors: 孟琦; 方锐; 孟宪明; 梁铭丰; 罗原; 王通; 吴昊; 黄亚烽; 张赛; 田杰斌; 任鹏飞; 李金柱
Original assignee: China Automotive Technology and Research Center Co Ltd; CATARC Tianjin Automotive Engineering Research Institute Co Ltd
Current assignee: China Automotive Technology and Research Center Co Ltd; CATARC Tianjin Automotive Engineering Research Institute Co Ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-02-26
Anticipated expiration: 2040-11-25
Also published as: CN112414650B

Abstract

The invention provides a device and a method for testing the hardness of an automobile seat in an in-loop manner, wherein the device comprises a movable main bracket, a hardness testing module and a movable auxiliary bracket; the movable main bracket comprises an upright post, a wheel set arranged at the bottom of the upright post and a cross beam with one end connected with the upright post; the hardness testing module is connected with the cross beam and can move along the length direction of the cross beam, and comprises a sliding table assembly, a force sensor connected with the lifting end of the sliding table assembly and a pressure plate connected with the force sensor; the movable auxiliary support comprises an auxiliary stand column, an auxiliary wheel set arranged at the bottom of the auxiliary stand column and a cross beam limiting part arranged on the auxiliary stand column, wherein one end of the cross beam far away from the stand column is detachably connected with the auxiliary stand column through the cross beam limiting part. The automobile seat hardness in-loop test equipment can be used for testing the hardness under the real-vehicle condition, does not damage the whole seat surface, is simple to operate, can be used for objectively and accurately testing the seat hardness, and has the test result consistent with subjective evaluation.

Description

Automobile seat hardness in-loop test equipment and test method

Technical Field

The invention belongs to the field of vehicle performance testing, and particularly relates to an in-loop testing device and a testing method for automobile seat hardness, which can be used for testing the hardness of an actual automobile in a loop state.

Background

At present, the comfort of the automobile seat becomes the content of great concern for the customer to buy the automobile, wherein the hardness of the seat is one of the contents that the customer can obviously perceive and evaluate, and the hardness of the seat has influence on various aspects such as posture maintenance, support, fatigue feeling and the like in the driving process. The Japanese style vehicle is usually designed with a softer seat surface, so that the short-term sitting comfort of a client is improved, and the client feels comfortable when sitting on the sofa. The German series vehicle seat is hard in design, can effectively support the body of a client when the client drives for a long time, is not too tired, and ensures better dynamic comfort.

The design of the hardness of the chair is a system project, and relates to various factors such as a suspension spring supporting mode of a chair framework, the thickness and density of a foaming layer, a surface sleeve material and a wrapping mode, a chair profile modeling and the like. The foaming layer has a large influence, and is softer under the same condition if TDI (toluene diisocyanate) with low density is used for foaming, and is harder under the same condition if MDI (polymethylene polyphenyl polyisocyanate) with high density is used for foaming, and the TDI and MDI mixed material can be used. Therefore, in the actual seat product development process, it is difficult to quantitatively define the hardness index, especially when defining the whole vehicle index, the hardness index definition experience of the real vehicle in the ring state is lacked, the real vehicle has no accurate hardness testing device and testing method, and when providing the index requirement to the product development team, the evaluation can be performed only by subjective feeling.

Disclosure of Invention

In view of the above, in order to solve the problems that hardness indexes of a real vehicle in a ring state are difficult to define, no quantitative index exists in a development process, subjective evaluation of products is unstable, and qualification rate is difficult to judge, the invention provides an in-ring test device and a test method for hardness of an automobile seat, which can perform hardness test under real vehicle conditions, do not damage a whole seat, are simple to operate, can objectively and accurately test the hardness of the seat, and have a test result consistent with subjective evaluation.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a car seat hardness is in the ring test equipment, including portable main support, hardness test module and portable auxiliary support; the movable main support comprises an upright post, a wheel set arranged at the bottom of the upright post and a cross beam with one end connected with the upright post; the hardness testing module is connected with the cross beam and can move along the length direction of the cross beam, and comprises a sliding table assembly, a force sensor connected with the lifting end of the sliding table assembly and a pressure plate connected with the force sensor; the movable auxiliary support comprises an auxiliary stand column, an auxiliary wheel set arranged at the bottom of the auxiliary stand column and a beam limiting part arranged on the auxiliary stand column, wherein one end of the beam far away from the stand column is connected with the auxiliary stand column in a detachable mode through the beam limiting part.

Furthermore, a sliding rail is arranged on the cross beam along the length direction of the cross beam, a sliding block matched with the sliding rail is arranged on the sliding rail, and the sliding block is connected with the hardness testing module through a mounting plate.

Furthermore, the two slide rails are respectively arranged on two opposite side surfaces of the cross beam; the mounting panel is U type structure, the mounting panel stride in on the crossbeam and be connected with the slider of both sides, install the handle on the mounting panel.

Furthermore, the crossbeam locating part set up about two on the limiting plate on the auxiliary stand, the auxiliary stand is the bracing piece of two vertical settings, and the frame groove region that the limiting plate that sets up about two and the bracing piece of two vertical settings enclose is the crossbeam inserted hole, the crossbeam is kept away from the one end detachable of stand inserts in the crossbeam inserted hole.

Furthermore, the sliding table assembly comprises a servo motor, a vertical sliding table module and a connecting plate connected with the sliding table module; the connecting plate is connected with the force sensor; the servo motor is connected with the servo motor driver and the module controller, controls the moving distance of the sliding table module through the upper computer and outputs a displacement signal; the force sensor is connected with the upper computer through a sensor controller and outputs a force signal to the upper computer.

Furthermore, the wheel set comprises a bottom plate and a plurality of sets of fortune horse wheels arranged at the bottom of the bottom plate; the bottom of the upright post is connected with the bottom plate; the auxiliary wheel set comprises an auxiliary bottom plate and a plurality of sets of fortune horse wheels arranged at the bottom of the auxiliary bottom plate, and the bottom of the auxiliary upright post is connected with the auxiliary bottom plate.

The support stabilizing module comprises a base, a lifting device arranged on the base and a supporting rod connected with the lifting end of the lifting device, the base is arranged on the upper end face of the bottom plate, the free end of the supporting rod can be used for supporting a chassis of an automobile body to be tested, and the lifting device is preferably a hydraulic cylinder.

Further, the bracket stabilizing module further comprises a sensor for collecting the upward thrust of the supporting rod and a display device for displaying the thrust value.

Furthermore, the support stabilizing module is also arranged on the auxiliary bottom plate.

The invention also provides an automobile seat hardness in-loop test method, which comprises the following steps:

(1) after a point to be tested on a test seat of a real vehicle to be tested is selected, pushing a movable main support to the position near a vehicle body seat, adjusting a hardness test module to a high position, pushing the hardness test module into the vehicle, adjusting the position of the movable main support to ensure that a cross beam is positioned above the point to be tested, adjusting the position of the hardness test module on the cross beam, and ensuring that a pressure plate is positioned right above the point to be tested;

(2) pushing the movable auxiliary support to one side of the vehicle body opposite to the movable main support, pushing the movable auxiliary support, and inserting one end of the cross beam, which is far away from the movable main support, into the cross beam limiting part to realize the connection between the movable main support and the movable auxiliary support;

(3) fixing the positions of the movable main support and the movable auxiliary support, starting the support stabilizing module, and enabling the supporting and jacking rod to ascend to prop against the chassis of the vehicle body to realize the fastening of the movable main support and the vehicle body;

(4) adjusting a hardness testing module, descending the pressure plate to the surface of the tested seat without contacting, resetting the force sensor, adjusting the descending position of the pressure plate again to contact with the surface of the seat and reach a pre-loading force value, and resetting the force sensor again;

(5) after two times of zero clearing, the measurement is started, and two test methods can be adopted:

determining the pressing depth, reading a force value: after the two times of zero clearing, starting measurement, continuously pressing the test point of the chair surface by the pressure plate, automatically unloading after pressing to a given position, recording the pressing-in amount and the pressing-in force value by the force sensor, storing data, and drawing a pressure-displacement curve;

or determining the press-in force value, reading the depth: after the two times of zero clearing, starting measurement, continuously pressing the test point of the chair surface by the pressure plate, reading the value of the force sensor, stopping full load when the value reaches a preset value, automatically unloading, recording the press-in amount and the press-in force value by the force sensor, storing data, and drawing a pressure-displacement curve;

according to the test requirements, the same point to be measured can be measured once or for multiple times, and then one or more pressure-displacement curves are drawn;

(6) and (3) data analysis: there are three methods of data analysis:

reading the force value at a given depth: according to the pressure-displacement curve, reading the force value at the same given press-in depth, directly reading the force value once in measurement, and measuring the average value of the force values which are required for multiple times;

or & -read the depth at a given force value: reading the displacement value corresponding to the same given press-in force according to the pressure-displacement curve, wherein the displacement value can be directly read after one-time measurement, and the average value of multiple displacement values required for multiple times is measured;

or reading the slope of a tangent line at a certain position of the curve as the static stiffness: and reading a tangent line at the position corresponding to the force value at a certain position of the curve according to the pressure-displacement curve, representing the static stiffness by the slope of the tangent line at the position, and measuring the average value of the slopes of the required tangents for multiple times.

When different seat hardnesses are compared, different point positions of the seat can be compared, the seat hardness is judged, and the larger the force value is, the harder the seat is. And when the average force value at the given press-in amount exceeds the enterprise standard, judging that the hardness of the seat exceeds the standard, and not allowing to be put on the market.

Compared with the prior art, the automobile seat hardness in-loop test equipment and the test method have the following advantages:

(1) the automobile seat hardness in-loop test equipment and the test method can not only measure the hardness of the whole seat, but also meet the requirement of testing the hardness of seats at different positions under the actual vehicle condition because the movable auxiliary support and the movable main support are detachably connected, do not damage the seat surface of the whole seat, are simple to operate, can objectively and accurately test the hardness of the seat, and have the test result consistent with subjective evaluation;

(2) the automobile seat hardness in-loop test equipment has a stable integral structure, an electric control system can eliminate human interference, and a relationship curve of the press-in force and the press-in amount can be objectively and accurately displayed, so that the seat hardness is judged;

(3) the support stabilizing module disclosed by the invention can be used for applying force to the chassis of the vehicle body upwards through the hydraulic cylinder and the supporting and jacking rod, so that the downward pressure is applied to the base of the testing equipment by means of the weight of the vehicle body, the testing equipment can be quickly and flexibly switched and the testing position can be locked, meanwhile, the support stabilizing module can be used for displaying the thrust value in real time on the display screen, the counter force of the supporting force is quantized, and the phenomenon that the chassis of the vehicle body is damaged due to shaking or overlarge running of the equipment caused by unders.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic representation of the stiffness of an automotive seat according to the present invention in operation with a loop test apparatus;

FIG. 2 is a schematic view of a partial structure of the vehicle seat stiffness in-loop test apparatus according to the present invention;

FIG. 3 is a schematic structural view of a mobile main support according to the present invention;

FIG. 4 is a cross-sectional view taken at A-A of FIG. 3;

FIG. 5 is a schematic structural diagram of a hardness testing module according to the present invention;

FIG. 6 is a schematic view of a mobile subframe according to the present invention;

FIG. 7 is a left side view of FIG. 6;

FIG. 8 is a schematic structural view of a stent stabilizing module according to the present invention;

fig. 9 is a force-displacement graph according to the present invention.

Description of reference numerals:

1-a mobile main support; 11-upright post; 12-a wheel set; 121-a bottom plate; 13-a cross beam; 14-a slide rail; 15-a slide block; 16-a mounting plate; 17-a handle;

2-a hardness testing module; 21-a slip assembly; 211-a servo motor; 212-a slide module; 213-a connecting plate; 22-a force sensor; 23-a platen;

3-a mobile secondary support; 31-auxiliary upright post; 32-a secondary wheel set; 321-subfloor; 33-beam stop; 34-beam insertion opening;

4-a scaffold stabilizing module; 41-ejector pins;

5-a seat; 6-vehicle body.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 to 8, an in-loop test apparatus for the hardness of a car seat comprises a movable main bracket 1, a hardness test module 2, a movable auxiliary bracket 3 and a bracket stabilizing module 4;

the movable main support 1 comprises a vertical column 11, a wheel set 12 arranged at the bottom of the vertical column 11 and a cross beam 13 with one end connected with the vertical column 11; the wheel set 12 comprises a bottom plate 121 and a plurality of sets of horse wheels arranged at the bottom of the bottom plate 121, the horse wheels are connected with the bottom plate 121 through bolts, the bottom of the upright post 11 is welded with the bottom plate 121, and the cross beam 13 is connected with the upright post 11 through a triangular connecting plate; two opposite side surfaces of the beam 13 along the length direction are respectively provided with a transverse sliding rail 14, and the sliding rails 14 are provided with sliding blocks 15 matched with the sliding rails 14; the slider 15 is provided with a mounting plate 16 provided with a handle 17, the mounting plate 16 is of a U-shaped structure, and spans the beam 13 and is connected with the sliders 15 at two sides through screws;

the hardness testing module 2 is connected with the sliding block 15 through the mounting plate 16 and can move along the length direction of the cross beam 13, and the hardness testing module 2 comprises a sliding table assembly 21, a force sensor 22 connected with the lifting end of the sliding table assembly 21 and a pressure plate 23 connected with the force sensor 22; the sliding table assembly 21 comprises a servo motor 211, a vertical sliding table module 212 and a connecting plate 213 connected with the sliding table module 212; the connecting plate 213 is connected with the force sensor 22; the servo motor 211 is connected with a servo motor driver and a module controller, controls the moving distance of the sliding table module 212 through a computer, and outputs a displacement signal; the force sensor 22 is connected with a computer through a sensor controller and outputs a force signal to the computer;

the movable auxiliary bracket 3 comprises an auxiliary upright column 31, an auxiliary wheel group 32 arranged at the bottom of the auxiliary upright column 31 and a beam limiting piece 33 arranged on the auxiliary upright column 31; the auxiliary wheel set 32 comprises an auxiliary bottom plate 321 and a plurality of sets of horse wheels arranged at the bottom of the auxiliary bottom plate 321, the horse wheels are connected with the auxiliary bottom plate 321 through bolts, and the bottom of the auxiliary upright column 31 is welded with the auxiliary bottom plate 321; the beam limiting pieces 33 are two limiting plates which are vertically arranged on the auxiliary upright post 31, the auxiliary upright post 31 is two vertically arranged supporting rods, a frame groove area defined by the two vertically arranged limiting plates and the two vertically arranged supporting rods is a beam inserting hole 34, and one end of the beam 13, which is far away from the upright post 11, is detachably inserted into the beam inserting hole 24, so that the beam 13 is connected with the movable auxiliary support 3;

the bracket stabilizing module 4 comprises a base arranged on the upper end surface of the bottom plate 121, a lifting device arranged on the base, a supporting rod 41 connected with the lifting end of the lifting device, a sensor for acquiring the upward thrust of the supporting rod 41 and a display device for displaying the thrust value; the lifting device is a hydraulic cylinder, and the free end of the supporting ejector rod 41 can be used for supporting a chassis of the vehicle body to be tested; the stand stabilizing module 4 has two, one is mounted on the bottom plate 121 of the movable main stand 1, and the other is mounted on the subsidiary bottom plate 321 of the movable subsidiary stand 3.

An automobile seat hardness in-loop test method comprises the following steps:

(1) after a point to be tested on a test seat 5 of a real vehicle to be tested is selected, a movable main support 1 is pushed to the position near the vehicle body seat 5, a hardness test module 2 is pushed into the vehicle after being adjusted to a high position, the position of the movable main support 1 is adjusted, a cross beam 13 is ensured to be positioned above the point to be tested, a handle 17 is pushed, the position of the hardness test module 2 on the cross beam 13 is adjusted, and a pressure plate 23 is ensured to be positioned right above the point to be tested;

(2) pushing the movable auxiliary support 3 to the side of the vehicle body 6 opposite to the movable main support 1, pushing the movable auxiliary support 3, and inserting one end of the cross beam 13 far away from the movable main support 1 into the cross beam limiting piece 33 to realize the connection between the cross beam 13 and the movable auxiliary support 3;

(3) the horseback wheels of the movable main support 1 and the movable auxiliary support 3 are adjusted downwards to fix the test equipment with the ground, the support stabilizing module 4 is started at the same time, the support ejector rod 41 rises to push against the chassis of the vehicle body to a preset value, and the movable main support 1 and the movable auxiliary support 3 are completely fastened with the vehicle body;

(4) adjusting the hardness testing module 2, lowering the pressure plate 23 to the surface of the tested seat without contacting, clearing the force sensor 22, adjusting the lowering position of the pressure plate 23 again to contact with the surface of the seat and reach a pre-loading force value (the pre-loading force value is 5N), and clearing the force sensor 22 again;

(5) after the two times of zero clearing, the measurement is started, the pressure plate 23 continues to press the point to be measured of the chair surface, the point to be measured is automatically unloaded after being pressed to a given position, the force sensor 22 records the press-in amount and the press-in force value, the data is stored, and a force-displacement curve (such as the force-displacement curve shown in fig. 9) is drawn;

(6) and measuring the same point to be measured three times, reading the force value at the same given press-in amount according to the curve, and averaging the force values of the three times to obtain the average force value under a certain specified press-in amount (press-in depth) of the point to be measured.

The meaning of measuring the same point location to be measured three times is to eliminate errors, the phenomenon that the force value of three times is gradually increased when the point location to be measured is continuously pressed down three times in the figure 9 is because the rebound of the seat foam needs a certain time and belongs to a normal phenomenon, and the difference value smaller than 20N is not judged as misoperation.

In fig. 9, for the same press-in, the displacement amount does not return to the original point when the force value is unloaded and cleared at the same speed, and the normal phenomenon is also caused by the internal stress of foam resilience.

Example 1

And pressing the measuring point position of the seat A into 30mm by adopting the automobile seat hardness in-loop test equipment and the test method, and unloading at the same speed. The force values at 30mm on the curve were read 150N for the first time, 158N for the second time and 165N for the third time, and averaged to 157.7N.

Example 2

And pressing 30mm of the same point position of the seat B by adopting the automobile seat hardness in-loop test equipment and the test method, and unloading at the same speed. The force values at 30mm on the curve were read for the first time 173N, the second time 181N, and the third time 190N, and averaged to 181.3N.

From the results obtained in examples 1 and 2, it is understood that the same spot is pressed in at the same depth, and the force value of the B seat is 23.6N greater than that of the a seat, indicating that the B seat is harder than the a seat. And if the enterprise uses more than 180N as the index of the unqualified seat hardness, judging that the seat B is unqualified.

Example 3

By adopting the automobile seat hardness in-loop test equipment and the test method, the hardness comfort test is carried out on two points A, B on a certain seat along the left side and the right side of the automobile in the transverse direction, the central position of a pressure plate is ensured to correspond to the test point position by adjusting the slide block along the left side and the right side of the automobile in the transverse direction, the two points are respectively pressed in for 30mm, then the two points are unloaded at the same speed, and the force value at the position of 30mm on. If the point A is 150N for the first time, 158N for the second time and 165N for the third time, the average value is 157.7N; the point B was 173N for the first time, 181N for the second time, 190N for the third time, and 181.3N for the average value. Point B was 23.6N greater than point A, indicating that point B was harder than point A. If the enterprise uses the left-right difference value exceeding 20N as the index of the unqualified seat hardness, the seat is judged to be unqualified.

Example 4

The automobile seat hardness in-loop test equipment and the test method are adopted to press 30mm into the measurement point position of the seat A, then the measurement point position is unloaded at the same speed, a force-displacement curve is obtained, the tangent slope corresponding to a certain position of the curve formed during pressing is read, namely the static stiffness, and the larger the tangent slope is, the larger the hardness is.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a car seat hardness is at ring test equipment which characterized in that: comprises a movable main bracket (1), a hardness testing module (2) and a movable auxiliary bracket (3); the movable main support (1) comprises an upright post (11), a wheel set (12) arranged at the bottom of the upright post (11), and a cross beam (13) with one end connected with the upright post (11); the hardness testing module (2) is connected with the cross beam (13) and can move along the length direction of the cross beam (13), and the hardness testing module (2) comprises a sliding table assembly (21), a force sensor (22) connected with the lifting end of the sliding table assembly (21) and a pressure plate (23) connected with the force sensor (22); the movable auxiliary support (3) comprises an auxiliary stand column (31), an auxiliary wheel set (32) arranged at the bottom of the auxiliary stand column (31) and a beam limiting part (33) arranged on the auxiliary stand column (31), wherein one end, far away from the stand column (11), of the beam (13) is detachably connected with the auxiliary stand column (31) through the beam limiting part (33).

2. The car seat stiffness in the ring test apparatus according to claim 1, wherein: the testing device is characterized in that a sliding rail (14) is arranged on the cross beam (13) along the length direction of the cross beam, a sliding block (15) matched with the sliding rail (14) is arranged on the sliding rail (14), and the sliding block (15) is connected with the hardness testing module (2) through a mounting plate (16).

3. The car seat stiffness in ring test apparatus of claim 2, wherein: the two sliding rails (14) are respectively arranged on two opposite side surfaces of the cross beam (13); mounting panel (16) are U type structure, mounting panel (16) stride in on crossbeam (13) and be connected with slider (15) of both sides, install handle (17) on mounting panel (16).

4. The car seat stiffness in the ring test apparatus according to claim 1, wherein: crossbeam locating part (33) be two about set up in limiting plate on vice stand (31), vice stand (31) are the bracing piece of two vertical settings, and the frame groove region that two limiting plates that set up from top to bottom and the bracing piece of two vertical settings enclose is crossbeam inserted hole (34), crossbeam (13) are kept away from the one end detachable of stand (11) inserts in crossbeam inserted hole (34).

5. The car seat stiffness in the ring test apparatus according to claim 1, wherein: the sliding table assembly (21) comprises a servo motor (211), a vertical sliding table module (212) and a connecting plate (213) connected with the sliding table module (212); the connecting plate (213) is connected with the force sensor (22); the servo motor (211) is connected with the servo motor driver and the module controller, and the moving distance of the sliding table module (212) is controlled through the upper computer; the force sensor (22) is connected with an upper computer through a sensor controller.

6. The car seat stiffness in ring test device according to any one of claims 1 to 5, wherein: the wheel set (12) comprises a bottom plate (121) and a plurality of sets of horse wheels arranged at the bottom of the bottom plate (121); the bottom of the upright post (11) is connected with the bottom plate (121); the auxiliary wheel set (32) comprises an auxiliary bottom plate (321) and a plurality of sets of Fuma wheels arranged at the bottom of the auxiliary bottom plate (321), and the bottom of the auxiliary upright post (31) is connected with the auxiliary bottom plate (321).

7. The car seat stiffness in ring test apparatus of claim 6, wherein: the support stabilizing module (4) comprises a base, a lifting device arranged in the base and a supporting rod (41) connected with the lifting end of the lifting device, the base is arranged on the upper end face of the bottom plate (121), and the free end of the supporting rod (41) can be used for supporting the chassis of the vehicle body to be tested.

8. The car seat stiffness in ring test apparatus of claim 7, wherein: the bracket stabilizing module (4) further comprises a sensor for collecting the upward thrust of the supporting rod (41) and a display device for displaying the thrust value.

9. The car seat stiffness in ring test apparatus of claim 8, wherein: the auxiliary bottom plate (321) is also provided with the bracket stabilizing module (4).

10. A test method of the car seat hardness in-loop test device according to claim 7, wherein: the method comprises the following steps:

(2) pushing the movable auxiliary support to one side of the vehicle body opposite to the movable main support, and pushing the movable auxiliary support to enable one end, far away from the movable main support, of the cross beam to be inserted into the cross beam limiting part;

according to the test requirements, the same point to be measured can be measured once or for multiple times, and one or more pressure-displacement curves are drawn;

(6) and (3) data analysis: there are three methods of data analysis: