Automobile crash test offset parameter calibration system and method

Abstract

The invention discloses an offset parameter calibration system and method for an automobile crash test, and belongs to the technical field of automobile crash calibration, and the method comprises the steps: firstly, carrying out the measurement calibration of the width L of a whole automobile through an automobile width measurement mechanism, adjusting a symmetric measurement scale to be in a central state, taking the center of an automobile body as a zero position, enabling the scale scales to extend towards two sides, and carrying out the calibration; therefore, half of the width of the vehicle body is measured, and the width of any vehicle body and a collision point position scribed line are calculated. Secondly, an overlapping calibration mechanism is used, the overlapping calibration mechanism is a parallelogram connecting rod linkage mechanism, a double-layer frame is used, the stability of the overlapping calibration mechanism is enhanced, position calibration of the vehicle and the rigid barrier body is conducted through a laser calibration device, and through a laser distance sensor, the overlapping calibration mechanism is kept perpendicular to the laser distance sensor, and by adjusting the overlapping calibration mechanism, position calibration of the vehicle and the rigid barrier body is achieved. Calibration and adjustment of the overlapping position of the rigid barrier and the vehicle body are achieved. Through the correction and adjustment of the overlap calibration mechanism, the overlap offset error of the vehicle can be controlled within + / -1mm, the error is greatly reduced, and the precision of the offset collision test of the vehicle is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile collision calibration, in particular to a system and method for calibrating bias parameters of an automobile collision test. Background Art

[0002] There are four main management rules for vehicle collision tests: national standard, C-NCAP, C-IASI, and Euro NCAP. There are 15 working conditions for ACU controller algorithm calibration, some of which require the test vehicle to perform partial overlap collision tests relative to the barrier system (fixed, movable, rigid, deformable barriers, etc.), with overlap rates of 25%, 40%, and 50% respectively. This is to evaluate the effectiveness of the test vehicle in protecting occupants at different overlap rates, the advancement of the vehicle structure design, the maintainability of the vehicle after a collision, and the accuracy and robustness of the ACU algorithm configured on the vehicle.

[0003] Taking the "Driver's Side 25% Offset Frontal Collision Test Procedure (2023 Edition)" in the China Insurance Automobile Safety Index (C-IASI) evaluation procedure as an example, it is required that the test vehicle and the fixed rigid barrier collide head-on with an overlap rate of 25% on the driver's side. That is, the test vehicle is required to collide head-on with a rigid barrier with an edge of a 150mm radius arc at a speed of 64.4km / h±1km / h. At the first moment of contact between the two, the width of the overlapping part in the direction of vehicle travel (ie X direction) must be strictly controlled within the range of 25%±1% of the vehicle width (1% is about 17mm~20mm), otherwise the test is deemed invalid. The following four factors are analyzed to affect the overlap rate: 1. Before the test, the minimum offset distance between the collision arc edge of the rigid barrier and the center line of the traction track in the Y direction is 25% of the vehicle width, and the position error requirement is ≤1mm; 2. Before the test, three collision identification lines need to be marked on the hood of the test vehicle, which are 24%, 25%, and 26% of the vehicle width, respectively, and are all parallel to the X-axis center plane, and the measurement error requirement is ≤1mm; 3. When starting, the X-axis center plane of the test vehicle coincides with the center line of the traction track, and the measurement error requirement is ≤1mm; 4. After the test, the vehicle undergoes an acceleration process of about 90m, and the Y-axis deviation error is ≤10mm. Since factor 4 is greatly affected by the adjustment status of the vehicle chassis at different development stages, it is impossible to further reduce the error through technical means. Therefore, whether factors 1, 2, and 3 are measured accurately is the key to whether the test is successful.

[0004] At present, the industry generally uses a ruler with a laser level with a tripod to measure distances. Its disadvantages are obvious: 1. Repeated steps and low efficiency. Each time a specified size is placed, it is necessary to use a ruler to measure whether the line hit by the laser on the ground is parallel to the center of the track. If the laser angle deviates slightly, multiple measurements are required to ensure parallelism. The whole process takes at least 15 minutes. In addition, if there are multiple sizes, the above steps need to be repeated, further extending the test preparation time; 2. Manual measurement has errors and poor accuracy. Since it is necessary to cooperate with personnel to measure multiple times, the measurement deviation will expand the parallel error between the laser and the track on a large scale; 3. There are many people for small things, and the input-output ratio is low. Since the laser needs to be parallel to the track in the entire size, a straight line is determined based on two points, and the measuring points need to be taken at least one near and one far. In fact, more points will be taken, so at least two people are required to cooperate in the measurement. Summary of the invention

[0005] In view of the above problems, the present invention provides a vehicle collision test bias parameter calibration system and test method, including an overlapping calibration mechanism, a vehicle width measurement calibration mechanism, a collision vehicle, and a rigid barrier. First, the vehicle width L is measured and calibrated by the vehicle width measurement mechanism, and the symmetrical measurement scale is adjusted to a centered state, with the center of the vehicle body as the zero position, and the scale scale extends to both sides to measure half of the vehicle body width, and then calculate the 25% vehicle body width and the collision point mark. Secondly, an overlapping calibration mechanism is used. This mechanism is a parallelogram linkage mechanism and uses a double-layer frame to enhance its stability. The lower X-axis No. 1 connecting rod has a locking centering device to adjust and lock the center with the drive track. The upper X-direction second link has an X-direction bidirectional laser calibration device to calibrate the position of the vehicle and the rigid barrier. The upper X-direction second link also has an X-direction and Y-direction level to ensure that it remains horizontal during laser calibration. An X-direction laser distance sensor is provided at one end of the upper X-direction second link. The laser irradiation reference plane is on the side of the upper X-direction first link and is perpendicular to the laser distance sensor. By adjusting the overlap calibration mechanism, the overlap position of the rigid barrier and the vehicle body can be calibrated and adjusted. Through the correction adjustment of the overlap calibration mechanism, the vehicle overlap offset error can be controlled within ±1mm, which greatly reduces the error and improves the accuracy of the vehicle offset collision test.

[0006] The technical solution of the present invention is as follows: a vehicle collision test bias parameter calibration system, comprising: an overlap calibration mechanism, a vehicle width measurement calibration mechanism, a collision vehicle and a rigid barrier body, wherein the overlap calibration mechanism is arranged between the collision vehicle and the rigid barrier body, on the travel path of the collision vehicle;

[0007] The overlapping calibration mechanism is a frame structure surrounded by a plurality of connecting rods and pins, and a reflection reference plate;

[0008] A bidirectional laser calibration device and a laser distance sensor are provided on one of the connecting rods. A reflective reference plate is provided on the light path of the laser distance sensor. There are four pins in total. The pins are hollow inside and have threaded through holes on the top for connecting the connecting rods to form a parallelogram connecting rod linkage mechanism. The connecting rods can rotate around the pins as the axis.

[0009] The vehicle width measurement and calibration mechanism includes a T-shaped symmetrical ruler and a measuring pole. The measuring poles are erected on both sides of the colliding vehicle so that they are kept in the same plane with the wheel center and perpendicular to the ground. The measuring poles cooperate with the T-shaped symmetrical ruler.

[0010] Furthermore, the connecting rods include an upper X-direction first connecting rod, an upper X-direction second connecting rod, an upper Y-direction first connecting rod, an upper Y-direction second connecting rod, a lower X-direction first connecting rod, a lower X-direction second connecting rod, a lower Y-direction first connecting rod and a lower Y-direction second connecting rod.

[0011] Furthermore, a Y-direction level and an X-direction level are also provided on the connecting rod provided with the bidirectional laser calibration device.

[0012] Furthermore, a universal wheel adjustment mechanism is provided on the pin shaft, and a universal wheel is provided at the bottom.

[0013] Furthermore, a positioning locking mechanism is provided on one of the connecting rods, including an adjustment handle, an adjustment cam and a locking pawl. The locking pawl is in the middle of the connecting rod, and adjustment cams are provided on both sides of the locking pawl. The adjustment cam cooperates with the adjustment handle.

[0014] A method for calibrating bias parameters of a vehicle collision test comprises the following steps:

[0015] S1 locates the overlapping calibration mechanism and calibrates it;

[0016] S2 places the collision vehicle and the vehicle width measurement calibration mechanism;

[0017] S3 collision line marker;

[0018] S4 adjusts the rigid barrier;

[0019] S5 performs calibration work.

[0020] Furthermore, step S1 is specifically as follows: placing the collision vehicle and the rigid barrier on the traction track, with a distance of 3m to 5m between the two, and the base of the rigid barrier is fixedly connected to the traction track; fixing the overlapping calibration mechanism on the traction track between the collision vehicle and the rigid barrier, turning on the laser calibration device, and shining one side of the laser on the test vehicle and the other side on the barrier system; after the laser is overlapped with the edge of the track, locking the position of the laser calibration device and the connecting rod; making the plane where the laser is located coincide with the center line of the traction track.

[0021] Furthermore, step S2 is specifically as follows: adjusting the tire pressure of the collision vehicle to ensure that all four tires have the same design tire pressure; positioning the vehicle's X-axis center plane through the collision vehicle's front and rear bumper license plate mounting holes so that the vehicle's X-axis center plane coincides with the laser line; placing the collision vehicle width measurement and calibration mechanism across the collision vehicle's front wheel axis, and the measuring rods must be close to the side surface of the front wheel; adjusting the T-shaped symmetric ruler so that its zero point is located in the middle between the two measuring rods, and at this time the laser line coincides with the center of the T-shaped symmetric ruler.

[0022] Furthermore, step S3 is specifically as follows: calculate the dimension that needs to be offset and find the corresponding scale on the T-shaped symmetrical scale; unfold the overlapping calibration mechanism to make the laser line completely coincide with the scale value on the required T-shaped symmetrical scale; mark the collision line along the laser line on the surface of the collision vehicle.

[0023] Furthermore, step S4 is specifically as follows: calculate the size that needs to be offset and find the corresponding scale on the T-shaped symmetrical ruler; unfold the overlapping calibration mechanism until the laser line completely coincides with the scale value on the required T-shaped symmetrical ruler; fine-tune the rigid barrier body along the Y direction so that the outermost arc surface of its edge is tangent to the laser line; and fix the collision surface of the barrier system.

[0024] The beneficial effects of the present invention are:

[0025] Through the application of this overlapping calibration mechanism, a single operator can quickly adjust the offset distance between multiple lasers and tracks with an error of less than 1mm, which not only improves efficiency, ensures accuracy, but also saves manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the overlapping calibration mechanism of the present invention;

[0027] Figure 2 It is a general schematic diagram of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the vehicle width measurement and calibration mechanism of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the positioning locking mechanism of the present invention;

[0030] Figure 5 The overlapping calibration mechanism of the present invention is in a folded state;

[0031] Figure 6 It is a flow chart of the present invention.

[0032] In the figure:

[0033] 1 Overlap calibration mechanism, 11 upper X-direction first link, 101 Y-direction level, 102 bidirectional laser calibration device, 103 X-direction level, 104 laser distance sensor, 12 upper X-direction second link, 1201 reflection reference plate, 13 upper Y-direction first link, 14 upper Y-direction second link, 15 lower X-direction first link, 16 lower X-direction second link, 1601 positioning locking mechanism, 1602 double-ear nut, 1603 adjustment handle, 1604 adjustment cam, 1605 locking pawl, 17 lower Y-direction first link, 18 lower Y-direction second link, 19 pin shaft, 110 universal wheel adjustment mechanism, 2 test vehicle, 201 vehicle width measurement calibration mechanism, 2011 measuring benchmark, 2012 T-type measuring scale, 202 rigid barrier, 203 X-direction calibration laser beam, 204 Y-direction ranging laser beam. DETAILED DESCRIPTION

[0034] It should be noted that in the description of the present invention, the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect" and the like should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral connection; the connection can be a mechanical connection or an electrical connection; the connection can be a direct connection or an indirect connection through an intermediate medium, and can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] A vehicle collision offset parameter calibration system and test method comprises an overlap calibration mechanism 1, a vehicle width measurement calibration mechanism 201, a collision vehicle 2 and a rigid barrier body 202.

[0037] The overlapping calibration mechanism includes an upper X-direction first link 11, a Y-direction level 101, a bidirectional laser calibration device 102, an X-direction level 103, a laser distance sensor 104, an upper X-direction second link 12, a reflection reference plate 1201, an upper Y-direction first link 13, an upper Y-direction second link 14, a lower X-direction first link 15, a lower X-direction second link 16, a positioning locking mechanism 1601, a lower Y-direction first link 17, a lower Y-direction second link 18, a pin 19, and a universal wheel adjustment mechanism 110.

[0038] The upper X-direction first link 11 includes a Y-direction level ruler 101, a bidirectional laser calibration device 102, an X-direction level ruler 103 and a laser distance sensor 104, wherein the Y-direction level ruler 101 is used to adjust the Y-direction horizontal parameters of the upper X-direction first link 11, and the X-direction level ruler 103 is used to adjust the X-direction horizontal parameters of the upper X-direction first link 11 to ensure the working level of the bidirectional laser calibration device 102, and the bidirectional laser calibration device 102 is used to calibrate the overlapping area between the test vehicle 2 and the rigid barrier 202.

[0039] The vehicle width measurement and calibration mechanism 201 includes a T-shaped symmetrical ruler 2012 and a measuring pole 2011. The measuring pole 2011 is erected on both sides of the vehicle body so that it and the wheel center are kept in the same plane and perpendicular to the ground. Together with the T-shaped symmetrical ruler 2012, it is used to measure the actual vehicle body width. When the vehicle body width is set to L, the final scale displayed on both sides of the T-shaped symmetrical ruler 2012 is L / 2, and the zero position of the T-shaped symmetrical ruler 2012 is the position of the center axis of the vehicle body.

[0040] There are four pins 19 in total, which are hollow and have threaded through holes on the top for connecting the connecting rods to form a parallelogram connecting rod linkage mechanism. The connecting rods can rotate freely along the pins. Due to the design of the hollow structure, the adjustment limit of the overlapping calibration mechanism 1 is that the two layers of connecting rods are in a straight line state that is completely overlapped in the Z direction. At this time, the calibration beam of the bidirectional laser calibration device 102 coincides with the center axis of the vehicle.

[0041] The universal wheel adjustment mechanism 110 is built into the pin shaft 19, and the height of the universal wheel can be adjusted by a handle to adjust the working level of the overlap calibration mechanism 1. When the overlap calibration mechanism 1 is moved, the universal wheel can facilitate its movement.

[0042] The positioning locking mechanism 1601 includes a double-ear nut 1602, an adjustment handle 1603, an adjustment cam 1604, and a locking pawl 1605, which is installed on the lower X-axis second connecting rod 16. The locking pawl 1605 is in the middle position and is used to fix the overlap calibration mechanism 1. There are adjustment cams 1604 on both sides of the locking pawl 1605. By rotating the adjustment handle 1603, the adjustment cam 1604 is close to the inner side of the track to achieve automatic centering adjustment, and the locking pawl 1605 is used to lock the lower X-axis second connecting rod 16 on the track, thereby achieving the purpose of fixing the overlap calibration mechanism 1.

[0043] The laser distance sensor 104 is installed at one end of the upper X-direction first connecting rod 11, and its laser beam is irradiated to the reflective reference plate 1201, which is used to feedback the calibration value of the overlap calibration mechanism 1. Assuming the feedback reading of the laser distance sensor is L1, the overlapping area between the test vehicle 2 and the rigid barrier 202 is L2, then L2 = L / 2-L1, and assuming that the overlap rate of the vehicle offset collision test is x%, then L2 = x% L = L / 2-L1.

[0044] After adjusting the working level of the overlap calibration mechanism 1, the connecting rod of the overlap calibration mechanism 1 is expanded and adjusted, and L1 is adjusted to the target data by calculating the L1 laser distance sensor 104 data. Then, the bidirectional laser calibration device 102 is used to bidirectionally project the laser beam to make a line mark on the front hood of the test vehicle 2. Then, under the guidance of the laser beam, the relative position of the steel barrier 202 and the test vehicle 2 is corrected and adjusted to realize the calibration of the overlap rate between the test vehicle and the rigid barrier.

[0045] The test vehicle 2 is the target collision test vehicle.

[0046] The rigid barrier body 202 is a laterally movable rigid barrier collision body. Ideally, it forms a rigid structure with the ground and has sufficient strength to ensure that the rigid barrier body 202 does not produce obvious deformation during the collision process. During collision tests with different overlap rates, the relative position of the rigid barrier body 202 can be adjusted in the Y direction to adapt to different test requirements.

[0047] A vehicle collision offset parameter calibration test method, the specific process is as follows

[0048] Step 1: Position the overlap calibration mechanism and calibrate

[0049] 1.1 Place the test vehicle and barrier system on the traction track (the track is in the center of the traction track), with a distance of 3m to 5m between them in the direction of the track extension. The base of the barrier system is fixedly connected to the traction track as required.

[0050] 1.2 At the appropriate position between the test vehicle and the barrier system, first retract the overlapping calibration mechanism (in a straight line in the Z direction); then put the adjustment cam on the lower surface of the lower X-axis second connecting rod into the traction track, and rotate the adjustment handle to make the adjustment cam close to the inner side of the track to achieve automatic centering; then rotate the double-ear nut and the locking pawl to lock the relative position of the lower X-axis second connecting rod and the track; finally, turn on the laser calibration device, with one side of the laser shining on the test vehicle and the other side shining on the barrier system.

[0051] 1.3 Gently push the upper X-axis first link outward to make the laser coincide with the edge of the track. If not, rotate the laser calibration device along the Z axis until they completely coincide, and then lock the relative position of the laser calibration device and the upper X-axis first link.

[0052] 1.4 Gently push the upper X-axis first connecting rod inward to restore the overlapping calibration mechanism to a straight state and keep the laser turned on. At this time, the plane where the laser is located coincides with the center line of the traction track.

[0053] Step 2: Place the vehicle and the vehicle width measurement calibration mechanism

[0054] 2.1 Adjust the tire pressure of the test vehicle to ensure that all four tires have the same design pressure.

[0055] 2.2 Locate the vehicle's X-axis center plane through the license plate mounting holes on the front and rear bumpers of the test vehicle so that the vehicle's X-axis center plane coincides with the laser line.

[0056] 2.3 Place the vehicle width measurement calibration mechanism across the center of the front wheel of the test vehicle, and the measuring poles must be close to the side surface of the front wheel.

[0057] 2.4 Adjust the T-shaped symmetrical ruler so that its zero point is located in the middle between the two measuring rods. At this time, the laser line coincides with the center of the T-shaped symmetrical ruler.

[0058] Step 3: Collision line marking

[0059] 3.1 Calculate the size that needs to be offset and find the corresponding scale on the T-shaped symmetrical ruler.

[0060] 3.2 Gently push the upper X-axis first connecting rod outward to unfold the overlapping calibration mechanism until the laser line completely coincides with the scale value on the required T-shaped symmetrical ruler.

[0061] 3.3 Mark the collision line along the laser line on the surface of the test vehicle.

[0062] 3.4 If you need to mark multiple sizes, repeat steps 3.1 to 3.3.

[0063] Step 4: Adjust the barrier system

[0064] 4.1 Calculate the size that needs to be offset and find the corresponding scale on the T-shaped symmetrical ruler.

[0065] 4.2 Gently push the upper X-axis first connecting rod outward to unfold the overlapping calibration mechanism until the laser line completely coincides with the scale value on the required T-shaped symmetrical ruler.

[0066] 4.3 Fine-tune the barrier system along the Y direction so that the outermost arc surface of its edge is tangent to the laser line.

[0067] 4.4 Fixed barrier system collision surface.

[0068] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any modification, equivalent replacement and improvement made by any person skilled in the art within the technical scope disclosed by the present invention and within the spirit and principle of the present invention shall be covered within the protection scope of the present invention. At the same time, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0069] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

Claims

1. A vehicle collision test bias parameter calibration system, characterized in that: include: Overlap calibration mechanism, vehicle width measurement calibration mechanism, collision vehicle and rigid barrier, the overlapping calibration mechanism is arranged between the collision vehicle and the rigid barrier, on the travel route of the collision vehicle; the overlapping calibration mechanism is a frame structure surrounded by multiple connecting rods and pins, and a reflection reference plate; one of the connecting rods is provided with a bidirectional laser calibration device and a laser distance sensor, the reflection reference plate is arranged on the light output path of the laser distance sensor, there are four pins in total, the interior is hollow, and a threaded through hole is provided on the top, which is used to connect each connecting rod to form a parallelogram connecting rod linkage mechanism, and the connecting rod can rotate with the pin as the axis; the vehicle width measurement calibration mechanism includes a T-shaped symmetrical ruler and a measuring pole, the measuring poles are erected on both sides of the collision vehicle respectively, so that they are kept in the same plane with the wheel center and perpendicular to the ground, and the measuring pole cooperates with the T-shaped symmetrical ruler.

2. The vehicle collision test bias parameter calibration system according to claim 1, characterized in that: The connecting rods include an upper X-direction first connecting rod, an upper X-direction second connecting rod, an upper Y-direction first connecting rod, an upper Y-direction second connecting rod, a lower X-direction first connecting rod, a lower X-direction second connecting rod, a lower Y-direction first connecting rod and a lower Y-direction second connecting rod.

3. The vehicle collision test bias parameter calibration system according to claim 1, characterized in that: The connecting rod provided with the bidirectional laser calibration device is also provided with a Y-direction level ruler and an X-direction level ruler.

4. The vehicle collision test bias parameter calibration system according to claim 1, characterized in that: A universal wheel adjustment mechanism is arranged on the pin shaft, and a universal wheel is arranged at the bottom.

5. The vehicle collision test bias parameter calibration system according to claim 1, characterized in that: A positioning locking mechanism is arranged on one of the connecting rods, including an adjusting handle, an adjusting cam and a locking pawl. The locking pawl is located in the middle of the connecting rod, and adjusting cams are arranged on both sides of the locking pawl. The adjusting cam cooperates with the adjusting handle.

6. A method for calibrating bias parameters of a vehicle collision test, characterized in that: The following steps are involved: S1 positioning and calibrating the overlapping calibration mechanism as described in any one of claims 1 to 5; S2 places the collision vehicle and the vehicle width measurement calibration mechanism; S3 collision line marker; S4 adjusts the rigid barrier; S5 performs calibration work.

7. A method for calibrating bias parameters of a vehicle collision test according to claim 6, characterized in that: Step S1 is specifically as follows: placing the collision vehicle and the rigid barrier on the traction track, with a distance of 3m to 5m between the two, and the base of the rigid barrier is fixedly connected to the traction track; fixing the overlapping calibration mechanism on the traction track between the collision vehicle and the rigid barrier, turning on the laser calibration device, and shining one side of the laser on the test vehicle and the other side on the barrier system; after the laser is overlapped with the edge of the track, locking the position of the laser calibration device and the connecting rod; making the plane where the laser is located coincide with the center line of the traction track.

8. The method for calibrating bias parameters of a vehicle collision test according to claim 6, characterized in that: Step S2 is specifically as follows: adjusting the tire pressure of the collision vehicle to ensure that all four tires have the same design tire pressure; positioning the vehicle's X-axis center plane through the collision vehicle's front and rear bumper license plate mounting holes so that the vehicle's X-axis center plane coincides with the laser line; placing the collision vehicle width measurement and calibration mechanism across the collision vehicle's front wheel axis, with the measuring rods all being in close contact with the front wheel side surface; adjusting the T-shaped symmetric ruler so that its zero point is located in the middle between the two measuring rods, and at this time the laser line coincides with the center of the T-shaped symmetric ruler.

9. The method for calibrating bias parameters of a vehicle collision test according to claim 6, characterized in that: Step S3 specifically includes: calculating the dimension to be offset and finding the corresponding scale on the T-shaped symmetrical scale; unfolding the overlapping calibration mechanism to make the laser line completely coincide with the scale value on the required T-shaped symmetrical scale; marking the collision line along the laser line on the surface of the collision vehicle.

10. The method for calibrating bias parameters of a vehicle collision test according to claim 6, characterized in that: Step S4 is specifically as follows: calculate the size that needs to be offset and find the corresponding scale on the T-shaped symmetrical ruler; unfold the overlapping calibration mechanism until the laser line completely coincides with the scale value on the required T-shaped symmetrical ruler; fine-tune the rigid barrier along the Y direction so that the outermost arc surface of its edge is tangent to the laser line; and fix the collision surface of the barrier system.

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