Automatic multifunctional automobile frequency deviation test device and test method based on roll-off method

Abstract

The present invention discloses an automated multifunctional automobile frequency deviation test device and test method based on a roll-off method. Specifically, based on the roll-off method in the frequency deviation test, the limit rod assembly and the push rod assembly work together to align the left and right tires of the vehicle, ensuring that the left and right wheels fall from the test device at the same time. At the same time, the limit rod assembly rotates in the opposite direction to adjust the height between the edge of the support platform assembly and the ground. This height is steplessly adjustable and can be set arbitrarily. Compared with existing devices with several gears of adjustment, it has a wider range of applications and can meet the frequency deviation test boss height requirements of various vehicle models with different suspensions. The overall device is stronger and less prone to deformation, and has better promotion prospects. The corresponding frequency deviation test method realizes automation of the test process through the combined control of a speaker, a sound receiver, a limit rod motor, and a push rod motor. The driver can complete the entire measurement process without getting off the vehicle, saving labor and debugging time and greatly improving test efficiency.

Description

Technical Field

[0001] The present invention relates to the field of automobile testing, and in particular to an automated multifunctional automobile frequency deviation test device and a test method based on a roll-off method. Background Art

[0002] The natural frequency of a vehicle's suspension system (also known as the yaw frequency) is determined by the suspension stiffness and the mass supported by the suspension springs (sprung mass). For a given vertical load, the lower the suspension stiffness, the lower the natural frequency. However, the lower the stiffness, the more space the wheel requires for up-and-down movement, making this difficult to achieve in structural design for trucks with large sprung masses. For a given suspension stiffness, the greater the sprung mass, the greater the vertical deflection of the suspension, which in turn lowers the natural frequency. The wider the range of sprung mass variation, the greater the frequency variation. The yaw frequency is a key indicator of vehicle ride comfort. If the suspension yaw frequency is close to the vibration frequency during unloaded braking, it can cause vehicle body shake during unloaded braking, compromising driving safety. If the yaw frequency coincides with the road excitation frequency, the wheel assembly is prone to resonance, amplifying the excitation force from the road and transmitting it to the frame / body, impacting the vehicle's NVH performance.

[0003] There are three methods for testing vehicle frequency deviation: roll-off, pull-down, and drop-off. The roll-off method is generally used to measure vehicle frequency deviation. The roll-off method involves driving the wheel on the test end of the vehicle along an incline onto a bump (the bump height can be 60, 90, or 120 mm, depending on the vehicle type and suspension structure, and the lateral width must ensure that the entire wheel rests on the bump). After parking the vehicle, putting it in neutral, and turning off the engine, the wheel is then pushed off the bump. During the roll-off, both the left and right wheels should land simultaneously. However, the device using this method cannot ensure that the two bumps are aligned, and therefore the wheels cannot land simultaneously. Furthermore, the test device is typically manually adjusted, which is inefficient, time-consuming, and labor-intensive.

[0004] For example, the frequency deviation test device proposed by the industry uses the roll-off method to measure the frequency deviation of the entire vehicle, and includes guide rails and multiple load-bearing mechanisms; the load-bearing mechanisms include a base, a first raised platform, and a second raised platform; the base is provided with a slide groove for the guide rail to move, and the guide rail is mounted on the base via the slide groove; the side wall of the base has a first inclined surface, the first raised platform is placed on the base, the side wall of the first raised platform has a second inclined surface, the second raised platform is placed on the first raised platform, and the side wall of the second raised platform has a third inclined surface, the first inclined surface, the second inclined surface, and the third inclined surface are located on the same side of the guide rail; the guide rail is detachably mounted with multiple screws. This existing technology can achieve three height adjustments to meet the requirements of different vehicle tests through a three-level base height to meet the requirements of different vehicle test heights. However, the following problems still exist: First, it is impossible to ensure that the line connecting the two wheels is parallel to the edges of the two bosses, and it is also impossible to ensure that the wheels fall at the same time; second, the test and debugging process is relatively complicated, requiring tedious manual operations, and the debugging time is relatively long. The degree of automation is low, which cannot meet the needs of large-scale applications such as vehicle manufacturers and test sites. Summary of the Invention

[0005] In view of the above, the present invention aims to provide an automated multifunctional automobile frequency deviation test device and test method based on a roll-off method to address the shortcomings of existing test solutions.

[0006] The technical solution adopted in the present invention is as follows:

[0007] In a first aspect, the present invention provides an automated multifunctional automobile frequency deviation test device based on a roll-off method, comprising: a support platform assembly, a fixing assembly, a limit rod assembly, and a push rod assembly;

[0008] Among them, two support plates are symmetrically installed on the support platform of the support platform assembly, and bearings are respectively installed at both ends of the support platform assembly and on both sides of the support plates for installing the push rod transmission shaft and the limit rod transmission shaft;

[0009] A push rod motor and a limit rod motor are installed in the middle of the support platform, the push rod transmission shaft is connected to the push rod motor, and the limit rod transmission shaft is connected to the limit rod motor;

[0010] The fixed assembly is used to securely connect to the ground of the test site and includes: a fixing pin, a bearing, and a bearing seat; the bearing is pre-installed on the bearing seat and integrally mounted on the bearing seat groove of the support platform, and is fixed to the fixing pin mounting hole of the support platform by the fixing pin; the support platform assembly, the limit rod assembly, and the push rod assembly rotate relative to the axis of the bearing in the fixed assembly;

[0011] The limit rod assembly adopts a symmetrical structure. The first outer connecting rods at both ends are connected by a limit rod. The two first inner connecting rods are connected to the limit rod. The first outer connecting rod and the first inner connecting rod are also connected to the limit rod transmission shaft respectively. The first outer connecting rod, the first inner connecting rod and the limit rod move together as a whole. The distance between the two first inner connecting rods is small, and the distance between the two first outer connecting rods is large.

[0012] The push rod assembly adopts a symmetrical structure. The second outer connecting rods at both ends are connected by a push rod. The two second inner connecting rods are connected to the push rod. The second outer connecting rod and the second inner connecting rod are also connected to the push rod transmission shaft respectively. The second outer connecting rod, the second inner connecting rod and the push rod move together as a whole. The distance between the two second inner connecting rods is small, and the distance between the two second outer connecting rods is large.

[0013] The test device also includes: a controller electrically connected to the push rod motor and the limit rod motor, a sound receiver electrically connected to the controller, and a pressure sensor installed on the support plate for sensing the load on the left and right wheels.

[0014] In at least one possible implementation, the push rod transmission shaft cooperates with the worm of the push rod motor through a worm gear to form a worm gear transmission; the limit rod transmission shaft cooperates with the worm of the limit rod motor through a worm gear to form a worm gear transmission.

[0015] In at least one possible implementation, a bearing is installed in the middle of the support platform, and the output shafts of the push rod motor and the limit rod motor are respectively fixed to two motor reinforcement ribs on the support platform through the bearings.

[0016] In at least one possible implementation manner, a first sliding sleeve that rotates around the limiting rod is installed on the limiting rod between the first outer connecting rod and the first inner connecting rod.

[0017] In at least one possible implementation manner, a second sliding sleeve rotating around the push rod is installed on the push rod between the second outer connecting rod and the second inner connecting rod.

[0018] In at least one possible implementation manner, both ends of the fixing pin are respectively provided with an inner hexagonal wrench slot and a thread.

[0019] In at least one possible implementation manner, a groove for mounting the support plate is provided on the upper surface of the support platform of the support platform assembly.

[0020] In at least one possible implementation manner, the support plate is not in direct contact with the support platform, and the pressure sensor is connected between the support plate and the support platform.

[0021] In a second aspect, the present invention provides an automated multifunctional vehicle frequency deviation test method based on a roll-off method, comprising:

[0022] Start the frequency deviation test device through the controller;

[0023] Drive the vehicle onto the frequency deviation test device and press the wheel corresponding to the suspension to be tested onto the support plate;

[0024] The pressure sensor detects whether both the left and right wheels are pressed on the support plate and the vehicle is in a parked state;

[0025] After determining that the set conditions are met, the controller drives the speaker to emit a first prompt sound for adjusting the wheel posture;

[0026] After the wheels are aligned and the engine is turned off and in neutral, the vehicle emits a second warning tone through the horn to indicate the height at which the wheels have rolled down.

[0027] The second prompt sound is collected by the sound receiver and fed back to the controller, which triggers the controller to control the push rod motor and the limit rod motor to correspondingly drive the push rod assembly and the limit rod assembly to make the wheel roll off the support platform assembly, which is used to obtain the frequency deviation data of the suspension to be tested.

[0028] In at least one possible implementation, the trigger controller controls the push rod motor and the limit rod motor to correspondingly drive the push rod assembly and the limit rod assembly, including:

[0029] Controlling the limit rod motor to drive the limit rod transmission shaft to rotate the limit rod assembly to a preset position;

[0030] Controlling the push rod motor to drive the push rod transmission shaft to rotate the push rod assembly to push the two wheels;

[0031] After the push rod assembly and the limit rod assembly clamp the tire and the controller detects an abnormal current signal of the push rod motor, the movement of the push rod assembly is stopped;

[0032] Control the limit rod motor to drive the limit rod transmission shaft to rotate the limit rod assembly in the opposite direction and rotate the support platform assembly and the wheels on both sides around the bearing axis in the fixed assembly, so as to tilt the edge of the support platform assembly relative to the ground;

[0033] The height change is controlled by controlling the number of revolutions of the limit rod motor;

[0034] Keep the limit rod assembly in place and drive the push rod assembly to continue pushing the wheels, so that both wheels roll off the frequency deviation test device at the same time.

[0035] Compared with the existing technology, the main design concept of the present invention is to provide a frequency offset test scheme with higher test accuracy and the ability to automatically adjust the wheel connection line to be parallel to the boss edge. Specifically, based on the roll-off method used in frequency offset testing, the limit rod assembly and the push rod assembly work together to align the vehicle's left and right tires, ensuring that both wheels drop from the test device at the same time. At the same time, the limit rod assembly rotates in the opposite direction to adjust the height of the support platform assembly edge above the ground. This height is steplessly adjustable and can be set arbitrarily. Compared with existing devices with several levels of adjustment, this device has a wider range of applications and can meet the frequency offset test boss height requirements for various vehicle models with different suspensions. The overall device is stronger and less prone to deformation, which has better prospects for promotion. The corresponding frequency offset test method automates the test process through the combined control of a speaker, a sound receiver, a limit rod motor, and a push rod motor. The driver can complete the entire measurement process without having to exit the vehicle, saving labor and debugging time and significantly improving test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0037] Figure 1 A front schematic diagram of an automated multifunctional automobile frequency deviation test device based on a roll-off method provided in an embodiment of the present invention;

[0038] Figure 2 A schematic diagram of the back side of an automated multifunctional automobile frequency deviation test device based on a roll-off method provided by an embodiment of the present invention;

[0039] Figure 3 Schematic diagram of the front structure of the support platform assembly provided by an embodiment of the present invention

[0040] Figure 4 A schematic diagram of the back structure of the support platform assembly provided in an embodiment of the present invention;

[0041] Figure 5 A schematic cross-sectional view of a support platform assembly provided in an embodiment of the present invention;

[0042] Figure 6 A schematic diagram of the fixed assembly structure provided in an embodiment of the present invention;

[0043] Figure 7 A schematic structural diagram of a limit rod assembly provided in an embodiment of the present invention;

[0044] Figure 8 A schematic structural diagram of a push rod assembly provided in an embodiment of the present invention;

[0045] Figure 9 A cross-sectional schematic diagram of a frequency deviation test device provided by an embodiment of the present invention installed on the ground;

[0046] Figure 10 A schematic flow chart of an automated multifunctional vehicle frequency deviation test method based on a roll-off method provided in an embodiment of the present invention;

[0047] Figure 11 A side view of the working arrangement of the frequency deviation test device provided by an embodiment of the present invention (I);

[0048] Figure 12 Side view (2) of the working distribution of the frequency deviation test device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0050] The present invention proposes an embodiment of an automated multifunctional automobile frequency deviation test device and test method based on a roll-off method. Specifically, Figures 1 to 9 As shown, it includes: a support platform assembly 1, a fixing assembly 2, a limiting rod assembly 3 and a push rod assembly 4.

[0051] The upper surface of the support platform 11 of the support platform assembly 1 is provided with grooves for symmetrically mounting two support plates 12. The support plates 12 can be enlarged as needed to cover the wheelbases of different vehicle models. Bearings 16 are respectively installed at both ends of the support platform assembly 1 and on both sides of the support plate 12 for mounting the push rod drive shaft 14 and the limit rod drive shaft 15. In other words, the push rod drive shaft 14 and the limit rod drive shaft 15 are each fixed on the support platform 11 by four bearings 16, allowing the push rod drive shaft 14 and the limit rod drive shaft 15 to rotate freely within the support platform assembly 1. In addition, the material of both shafts has a certain degree of rigidity and is not easily deformed.

[0052] In the middle of the support platform 11, the push rod motor 17 and the limit rod motor 18 can be connected to the support platform 11 by bolts or other fixing methods. The push rod transmission shaft 14 is connected to the push rod motor 17, and the limit rod transmission shaft 15 is connected to the limit rod motor 18. Specifically, the push rod transmission shaft 14 can realize worm gear transmission with the worm 171 of the push rod motor 17 through the worm wheel 141, and the limit rod transmission shaft 15 can realize worm gear transmission with the worm 181 of the limit rod motor 18 through the worm wheel 151. In addition, a bearing 16 is also installed in the middle of the support platform 11. The output shafts of the push rod motor 17 and the limit rod motor 18 are respectively fixed to the two motor reinforcement ribs 114 on the support platform 11 through the bearing 16. In this preferred embodiment, the use of worm gear transmission has the following two characteristics: first, a smaller worm torque can achieve a larger worm wheel torque; second, the structure has a self-locking function, that is, when the worm wheel rotates, it will not drive the worm to rotate. According to this feature, for example, the push rod motor 17 rotates at low torque to drive the push rod transmission shaft 14 to rotate at high torque, and the push rod transmission shaft 14 will not drive the push rod motor 17 to rotate when subjected to external force.

[0053] The fixing assembly 2 is used for ground connection of the test site and mainly consists of three parts: a fixing pin 21, a bearing 22 and a bearing seat 23. The bearing 22 is pre-installed on the bearing seat 23, and then the whole is installed in the bearing seat groove 111 of the support platform 11 (refer to Figure 4 ) and finally fix the fixing pin 21 to the fixing pin mounting hole 112 of the support platform 11 (refer to Figure 4 To facilitate the fixing operation, in some preferred embodiments, the ends of the fixing pin 21 may be provided with an Allen wrench slot 211 and a thread 212. The support platform assembly 1, the limit rod assembly 3 and the push rod assembly 4 can rotate relative to the axis of the bearing 22 in the fixed assembly 2.

[0054] The limiting rod assembly 3 has a symmetrical structure. The first outer connecting rods 34 at both ends are connected by a limiting rod 31. The two first inner connecting rods 32 are also connected to the limiting rod 31. The first outer connecting rods 34 and the first inner connecting rods 32 are also connected to the limiting rod transmission shaft 15. The first outer connecting rods 34, the first inner connecting rods 32, and the limiting rod 31 move together as a whole. The distance between the two first inner connecting rods 32 is relatively small, while the distance between the two first outer connecting rods 34 is relatively large. This allows the left and right tires of different vehicle models to be respectively secured within the left and right first outer connecting rods 34 and first inner connecting rods 32. Preferably, a first sliding sleeve 33 is mounted on the limiting rod 31 between the first outer connecting rods 34 and the first inner connecting rods 32. The first sliding sleeve 33 can rotate about the limiting rod 31, thereby reducing the resistance of the limiting rod assembly to the wheel.

[0055] The push rod assembly 4 also adopts a bilaterally symmetrical structure. The second outer connecting rods 44 at each end are connected by a push rod 41. The two second inner connecting rods 42 are also connected to the push rod 41. The second outer connecting rods 44 and the second inner connecting rods 42 are also each connected to the push rod transmission shaft 14. The second outer connecting rods 44, the second inner connecting rods 42, and the push rod 41 move together as a whole. The distance between the two second inner connecting rods 42 is relatively small, while the distance between the two second outer connecting rods 44 is relatively large. This allows the left and right tires of different vehicle models to be respectively secured within the left and right second outer connecting rods 44 and second inner connecting rods 42. Preferably, a second sliding sleeve 43 is mounted on the push rod 41 between the second outer connecting rods 44 and the second inner connecting rods 42. The second sliding sleeve 43 can rotate around the push rod 41, thereby reducing the resistance of the push rod assembly to the wheel.

[0056] Combined with the above embodiments and Figure 9 As shown in the figure, when the device is in the initial state, the upper surfaces of the support platform assembly 1, the fixed assembly 2, the limit rod assembly 3 and the push rod assembly 4 are flush with the upper surface of the ground (hard road surface such as cement road), and the lower parts fall on the upper surface of the groove reserved in the ground, wherein the fixed assembly 2 and the ground can be connected by means of but not limited to bolts.

[0057] In addition, the test device also includes: a controller (not shown) electrically connected to the push rod motor 17 and the limit rod motor 18, a sound receiver 6 electrically connected to the controller, and a pressure sensor 13 installed on the support plate 12 for sensing the loads on the left and right wheels; the pressure sensor 13 and the sound receiver 6 together constitute the detection component of the device, and the push rod motor 17, the limit rod motor 18 and the speaker 8 together constitute the execution component of the device.

[0058] The test method of the device will be described later based on this, which will not be repeated here. It can be further explained that the assembly method of the pressure sensor 13 can refer to the following preferred example. The support plate 12 is not in direct contact with the support platform 11, and the pressure sensor 13 is connected between the two (refer to Figure 5 In this way, when the left and right wheels press on the support plates 12 on the left and right sides, the pressure sensors 13 can sense the loads on the wheels.

[0059] Corresponding to the above device, the present invention also provides an automated multifunctional frequency deviation test method, such as Figure 10 Shown, including:

[0060] Step S1, starting the frequency deviation test device through the controller;

[0061] Step S2: driving the vehicle onto the frequency deviation test device (which may be, but is not limited to, manually driven by a driver), and pressing the wheel corresponding to the suspension to be tested onto the support plate;

[0062] Step S3: Detecting, using pressure sensors, whether both left and right wheels are pressing on the support plate (i.e., the value deviation of the left and right pressure sensors is within a certain range) and the vehicle is in a parked state;

[0063] If any of the set conditions in this step are not met, you need to continue adjusting the vehicle.

[0064] Step S4: When it is determined that the set conditions are met, the controller drives the speaker to emit a first prompt sound to adjust the wheel posture.

[0065] Step S5: After the wheels are aligned and the engine is turned off and in neutral, the vehicle outputs a second prompt tone through the speaker to indicate the wheel roll-off height (e.g., a long press for 3 seconds indicates a wheel roll-off height of 60 degrees, a short press once and a long press for 3 seconds indicates a wheel roll-off height of 90 degrees, and a short press twice and a long press for 3 seconds indicates a wheel roll-off height of 120 degrees. Of course, this is not limited to these examples).

[0066] Step S6: The sound receiver collects the second prompt sound and feeds it back to the controller, triggering the controller to control the push rod motor and the limit rod motor, and correspondingly driving the push rod assembly and the limit rod assembly to make the wheel roll off the support platform assembly, so as to obtain the frequency deviation data of the suspension to be tested.

[0067] Regarding step S6, please refer to the following sub-steps in conjunction with the diagram:

[0068] Control the limit rod motor to drive the limit rod transmission shaft 15 to rotate the limit rod assembly 3 (counterclockwise around the limit rod transmission shaft as shown in the figure) to a preset position;

[0069] Control the push rod motor to drive the push rod transmission shaft 14 to rotate the push rod assembly 4 (rotate clockwise around the push rod transmission shaft) to push the two wheels so that the wheel axis corresponds to the axis of the push rod transmission shaft; (such as Figure 11 As shown, the two axes are parallel and the connecting line is perpendicular to the ground)

[0070] When the push rod assembly 4 and the limit rod assembly 3 completely clamp the tire, the push rod motor will generate a large current fluctuation due to overload. After the controller detects the abnormal current signal of the push rod motor, it stops the movement of the push rod assembly 4;

[0071] The limit rod motor is controlled to drive the limit rod transmission shaft 15 to rotate the limit rod assembly 3 in the opposite direction (clockwise around the limit rod transmission shaft as shown in the figure) and the support platform assembly 1 and the wheels on both sides rotate around the axis of the bearing 22 in the fixed assembly 2, so as to make the edge of the support platform assembly 1 tilt relative to the ground (such as Figure 12 Height H shown);

[0072] By controlling the number of revolutions of the limit rod motor, the height H can be controlled, thereby forming an effect of infinitely adjusting the drop height. Of course, in other preferred embodiments, an angle sensor or a height sensor can be added to dynamically adjust the height H.

[0073] Finally, the limit rod assembly 3 is kept in place, and the push rod assembly 4 continues to push the wheel clockwise, so that both wheels roll off the frequency deviation test device at the same time to obtain the frequency deviation of the suspension under test.

[0074] After the entire vehicle exits, the frequency deviation test device returns to its original position to test the suspension of the next axle of the vehicle or the suspension of other vehicles. After all tests are completed, the frequency deviation test device is turned off.

[0075] Although the present invention is described in conjunction with the above embodiments, the present invention is not limited to the above embodiments. For example, the initial installation height of the frequency deviation test device can be changed (such as the height of the support plate and the ground is 60 mm), so that the test device only needs to be raised by 30 mm and 60 mm, which is equivalent to the original adjustment of 60 / 90 / 120 mm, which can reduce energy consumption; the motor is changed to a hydraulic push rod, such as canceling the first sliding sleeve 33 in the limit rod assembly 3 (which will increase the resistance of the limit rod assembly to the wheel, which is not recommended) and canceling the second sliding sleeve 43 in the push rod assembly 4 (which will increase the resistance of the push rod assembly to the wheel, which is not recommended), or the shape of the connecting rod, or the structure of the support platform, or the form and number of bearings, or changing the sound receiving and transmitting device to an optical receiving and transmitting device, etc., or a person skilled in the art can easily modify and change them.

[0076] In summary, the main design concept of the present invention is to provide a frequency offset test scheme with higher test accuracy and the ability to automatically adjust the wheel connection line to be parallel to the boss edge. Specifically, based on the roll-off method in the frequency offset test, the limit rod assembly and the push rod assembly work together to align the left and right tires of the vehicle, ensuring that the left and right wheels fall from the test device at the same time; at the same time, the limit rod assembly rotates in the opposite direction to adjust the height between the edge of the support platform assembly and the ground. This height is steplessly adjustable and can be set arbitrarily. Compared with existing devices with several gears of adjustment, it has a wider range of applications and can meet the frequency offset test boss height requirements of different suspensions and various vehicle models. The overall device is stronger and less prone to deformation, and has better promotion prospects. The corresponding frequency offset test method realizes the automation of the test process through the combined control of a speaker, a sound receiver, a limit rod motor, and a push rod motor. The driver can complete the entire measurement process without getting off the vehicle, saving labor and debugging time and greatly improving test efficiency.

[0077] In the embodiment of the present invention, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, a and b, a and c, b and c, or a, b and c, where a, b, c can be single or multiple.

[0078] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred modes can be reasonably combined and matched into a variety of equivalent schemes by those skilled in the art without departing from or changing the design ideas and technical effects of the present invention; therefore, the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. An automated multifunctional automobile frequency deviation test device based on the roll-off method, characterized in that: include: Support platform assembly, fixing assembly, limit rod assembly and push rod assembly; Among them, two support plates are symmetrically installed on the support platform of the support platform assembly, and bearings are respectively installed at both ends of the support platform assembly and on both sides of the support plates for installing the push rod transmission shaft and the limit rod transmission shaft; A push rod motor and a limit rod motor are installed in the middle of the support platform, the push rod transmission shaft is connected to the push rod motor, and the limit rod transmission shaft is connected to the limit rod motor; The fixed assembly is used to securely connect to the ground of the test site and includes: a fixing pin, a bearing, and a bearing seat; the bearing is pre-installed on the bearing seat and integrally mounted on the bearing seat groove of the support platform, and is fixed to the fixing pin mounting hole of the support platform by the fixing pin; the support platform assembly, the limit rod assembly, and the push rod assembly rotate relative to the axis of the bearing in the fixed assembly; The limit rod assembly adopts a symmetrical structure. The first outer connecting rods at both ends are connected by the limit rod. The two first inner connecting rods are connected to the limit rod. The first outer connecting rod and the first inner connecting rod are also connected to the limit rod transmission shaft respectively. The first outer connecting rod, the first inner connecting rod and the limit rod move together as a whole. The distance between the two first inner connecting rods is smaller than the distance between the two first outer connecting rods. The push rod assembly adopts a symmetrical structure. The second outer connecting rods at both ends are connected by a push rod. The two second inner connecting rods are connected to the push rod. The second outer connecting rod and the second inner connecting rod are also connected to the push rod transmission shaft respectively. The second outer connecting rod, the second inner connecting rod and the push rod move together as a whole. The distance between the two second inner connecting rods is smaller than the distance between the two second outer connecting rods. The test device also includes: a controller electrically connected to the push rod motor and the limit rod motor, a sound receiver electrically connected to the controller, and a pressure sensor installed on the support plate for sensing the load on the left and right wheels.

2. The automatic multifunctional automobile frequency deviation test device based on the roll-off method according to claim 1 is characterized in that: The push rod transmission shaft cooperates with the worm of the push rod motor through the worm gear to form a worm gear transmission; the limit rod transmission shaft cooperates with the worm of the limit rod motor through the worm gear to form a worm gear transmission.

3. The automatic multifunctional automobile frequency deviation test device based on the roll-off method according to claim 1 is characterized in that: A bearing is also installed in the middle of the support platform, and the output shafts of the push rod motor and the limit rod motor are respectively fixed on the two motor reinforcement ribs on the support platform through the bearings.

4. The automatic multifunctional automobile frequency deviation test device based on the roll-off method according to claim 1 is characterized in that: A first sliding sleeve rotating around the limiting rod is installed on the limiting rod between the first outer connecting rod and the first inner connecting rod.

5. The automatic multifunctional automobile frequency deviation test device based on the roll-off method according to claim 1 is characterized in that: A second sliding sleeve rotating around the push rod is installed on the push rod between the second outer connecting rod and the second inner connecting rod.

6. The automatic multifunctional automobile frequency deviation test device based on the roll-off method according to claim 1 is characterized in that: Both ends of the fixing pin are respectively provided with an inner hexagonal wrench slot and a thread.

7. The automated multifunctional automobile frequency deviation test device based on the roll-off method according to any one of claims 1 to 6, characterized in that: The upper surface of the support platform of the support platform assembly is provided with a groove for installing the support plate.

8. The automatic multifunctional automobile frequency deviation test device based on the roll-off method according to claim 7 is characterized in that: The support plate is not in direct contact with the support platform, and the pressure sensor is connected between the support plate and the support platform.

9. An automated multi-function vehicle frequency deviation test method based on a roll-off method, the test method using the automated multi-function vehicle frequency deviation test device based on a roll-off method according to any one of claims 1 to 8, characterized in that: The test method includes: Start the frequency deviation test device through the controller; Drive the vehicle onto the frequency deviation test device and press the wheel corresponding to the suspension to be tested onto the support plate; The pressure sensor detects whether both the left and right wheels are pressed on the support plate and the vehicle is in a parked state; After determining that the set conditions are met, the controller drives the speaker to emit a first prompt sound for adjusting the wheel posture; After the wheels are aligned and the engine is turned off and in neutral, the vehicle emits a second warning tone through the horn to indicate the height at which the wheels have rolled down. The second prompt sound is collected by the sound receiver and fed back to the controller, which triggers the controller to control the push rod motor and the limit rod motor to correspondingly drive the push rod assembly and the limit rod assembly to make the wheel roll off the support platform assembly, which is used to obtain the frequency deviation data of the suspension to be tested.

10. The automated multifunctional vehicle frequency deviation test method based on the roll-off method according to claim 9, characterized in that: The trigger controller controls the push rod motor and the limit rod motor to correspondingly drive the push rod assembly and the limit rod assembly, including: Controlling the limit rod motor to drive the limit rod transmission shaft to rotate the limit rod assembly to a preset position; Controlling the push rod motor to drive the push rod transmission shaft to rotate the push rod assembly to push the two wheels; After the push rod assembly and the limit rod assembly clamp the tire and the controller detects an abnormal current signal of the push rod motor, the movement of the push rod assembly is stopped; Control the limit rod motor to drive the limit rod transmission shaft to rotate the limit rod assembly in the opposite direction and rotate the support platform assembly and the wheels on both sides around the bearing axis in the fixed assembly, so as to tilt the edge of the support platform assembly relative to the ground; The height change is controlled by controlling the number of revolutions of the limit rod motor; Keep the limit rod assembly in place and drive the push rod assembly to continue pushing the wheels, so that both wheels roll off the frequency deviation test device at the same time.

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