Vehicle test point coordinate measuring apparatus and method of determining vehicle test point coordinates

Abstract

The present disclosure relates to a kind of vehicle test point coordinate measuring equipment and the method for determining vehicle test point coordinate, in the vehicle test point coordinate measuring equipment, vehicle parking platform is at least partially rectangular plate structure, the intersection of the first edge and the second edge of the upper surface of vehicle parking platform is the measuring origin of vehicle test point coordinate measuring equipment, vehicle parking platform has slide rail structure, first range finder, second range finder and third range finder are respectively slidably connected with slide rail structure, processor is electrically connected with these range finders.First range finder, second range finder and third range finder are used to measure the distance of vehicle feature point to the first edge, and the processor is used to determine the coordinate of the test point of vehicle relative to the measuring origin based on the data measured by the above range finder and the distance of these range finders to the second edge.Using the present disclosure, when measuring the coordinate of test point relative to the measuring origin, the deviation caused by manual tape measure can be avoided, and the measurement accuracy can be improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicle centroid measurement, and in particular to a vehicle test point coordinate measurement device and a method for determining the vehicle test point coordinates. Background Art

[0002] After the vehicle is completed, the coordinates of the vehicle's center of mass in the vehicle body coordinate system are key data for reasonably distributing the vehicle load, conducting vehicle braking tests, and ensuring the operational stability of the vehicle.

[0003] Currently, a test bench is usually used to measure the center of mass coordinates of the vehicle in the test bench coordinate system. Then, the coordinates of the vehicle test point relative to the origin of the test bench are manually measured using a tape measure, and the measured center of mass coordinates of the vehicle in the test bench coordinate system are converted into the center of mass coordinates of the vehicle in the vehicle body coordinate system.

[0004] However, using the above measurement method, the error in manually measuring the coordinates of the vehicle test point relative to the origin of the test bench is relatively large. Summary of the Invention

[0005] The embodiments of the present disclosure provide a vehicle test point coordinate measurement device and a method for determining vehicle test point coordinates, which can solve the technical problems existing in the related art. The technical solutions are as follows:

[0006] In a first aspect, an embodiment of the present disclosure provides a vehicle test point coordinate measurement device, the vehicle test point coordinate measurement device comprising a vehicle parking platform, a first rangefinder, a second rangefinder, a third rangefinder, and a processor;

[0007] The vehicle parking platform at least partially has a rectangular plate structure, the upper surface of the vehicle parking platform has a first edge and a second edge perpendicular to each other, and the vehicle parking platform 1 has a slide rail structure 103, and the slide rail structure is parallel to the first edge;

[0008] The first rangefinder is slidably connected to the slide rail structure, and is used to determine a first distance L1 from the center of the outer wall of the left front wheel of the vehicle or the center of the outer wall of the right front wheel of the vehicle to the first edge, wherein the intersection of the first edge and the second edge is the measurement origin of the vehicle test point coordinate measuring device, and the midpoint of the line connecting the center of the outer wall of the left front wheel of the vehicle and the center of the outer wall of the right front wheel of the vehicle is the test point of the vehicle;

[0009] The third distance meter is slidably connected to the slide rail structure, and is used to determine a second distance L2 from a first feature point of the vehicle to the first edge;

[0010] The second rangefinder is slidably connected to the slide rail structure and is used to determine a third distance L3 from a second characteristic point of the vehicle to the first edge;

[0011] The processor is electrically connected to the first rangefinder, the second rangefinder, and the third rangefinder 4, and is used to determine a fourth distance L4 from the first rangefinder to the second edge, a fifth distance L5 from the second rangefinder to the second edge, and a sixth distance L6 from the third rangefinder to the second edge, and determine the coordinates of the test point relative to the measurement origin based on the first vehicle width value D1 corresponding to the first feature point, the second vehicle width value D2 corresponding to the second feature point, the third vehicle width value D3 corresponding to the center of the outer wall of the vehicle's front wheel, the first distance L1, the second distance L2, the third distance L3, the fourth distance L4, the fifth distance L5, and the sixth distance L6.

[0012] In a possible implementation, the vehicle parking platform includes a first platform body and a second platform body, and the slide rail structure includes a first slide rail and a second slide rail;

[0013] The first platform has a rectangular plate structure, the upper surface of the first platform has the first edge and the second edge, the first slide rail is located on the first edge and is parallel to the first edge, and the first rangefinder is slidably connected to the first slide rail;

[0014] The second platform has a rectangular plate structure and is slidably connected to the side wall of the first platform where the first edge is located. The upper surface of the second platform has a second slide rail, which is parallel to the first edge. The second rangefinder and the third rangefinder are respectively slidably connected to the second slide rail.

[0015] In a possible implementation, both the first slide rail and the second slide rail are electric slide rails;

[0016] The first slide rail is electrically connected to the processor and is configured to send a first distance signal to the processor, wherein the first distance signal includes a value of the fourth distance L4;

[0017] The second slide rail is electrically connected to the processor and is used to send a second distance signal and a third distance signal to the processor, where the second distance signal includes a value of the fifth distance L5, and the third distance meter includes a value of the sixth distance L6.

[0018] In a possible implementation, the second slide rail includes a first slide groove and a second slide groove, and the first slide groove and the second slide groove are arranged at intervals in the extension direction of the second edge and are both parallel to the first edge.

[0019] In a possible implementation, the second rangefinder is slidably connected to the first sliding groove, and the third rangefinder is slidably connected to the second sliding groove.

[0020] In a possible implementation, the vehicle parking platform further includes a first lifting frame and a second lifting frame, wherein the lower surface of each of the first lifting frame and the second lifting frame has two sliding protrusion structures, and the two sliding protrusion structures are respectively located in a first chute and a second chute, and are respectively slidably connected to the first chute and the second chute;

[0021] The second rangefinder is connected to the upper surface of the first lifting frame;

[0022] The third rangefinder is connected to the upper surface of the second lifting frame.

[0023] In a possible implementation, the first rangefinder, the second rangefinder, and the third rangefinder are all laser rangefinders.

[0024] In a possible implementation, projections of the lasers of the first rangefinder, the second rangefinder, and the third rangefinder in the vertical direction are all located on the first edge.

[0025] In a second aspect, an embodiment of the present disclosure provides a method for determining the coordinates of a vehicle test point, the method being applied to a vehicle test point coordinate measuring device, the method comprising determining a first coordinate system and a measurement origin corresponding to the measuring device based on a first edge and a second edge of a vehicle parking platform, wherein the first coordinate system includes a first horizontal axis and a first vertical axis;

[0026] Determining a second coordinate system and a test point corresponding to the vehicle based on a first characteristic point of the vehicle, a first vehicle width value D1 corresponding to the first characteristic point, a second characteristic point of the vehicle, a second vehicle width value D2 corresponding to the second characteristic point, and the center of an outer wall of a left front wheel of the vehicle, wherein the second coordinate system includes a second horizontal axis and a second vertical axis;

[0027] determining a sixth distance L6 from the third rangefinder to the first longitudinal axis, and determining a second distance L2 from the first feature point to the first transverse axis;

[0028] determining a fifth distance L5 from the second rangefinder to the first longitudinal axis, and determining a third distance L3 from the second feature point to the first transverse axis;

[0029] Determine a fourth distance L4 from the first rangefinder to the first longitudinal axis, and determine a first distance L1 from the center of the outer wall of the left front wheel of the vehicle to the first transverse axis;

[0030] Determine a target distance T1 from a third characteristic point of the vehicle to the test point, wherein the third characteristic point is the intersection of the second horizontal axis and the reverse extension of a perpendicular line from the center of the outer wall of the left front wheel of the vehicle to the first horizontal axis;

[0031] The coordinates of the test point relative to the measurement origin are determined based on the sixth distance L6 , the fifth distance L5 , the fourth distance L4 , the third distance L3 , the second distance L2 , the first distance L1 , and the target distance T1 .

[0032] In a possible implementation, determining the coordinates of the test point relative to the measurement origin based on the sixth distance L6, the fifth distance L5, the fourth distance L4, the third distance L3, the second distance L2, the first distance L1, and the target distance T1 includes:

[0033] determining a deflection angle α of the second transverse axis relative to the first transverse axis based on the sixth distance L6, the fifth distance L5, the second distance L2, and the third distance L3;

[0034] Determining the target distance T1 based on the deflection angle α and a third vehicle width value D3 corresponding to the center of the outer wall of the front wheel of the vehicle;

[0035] Based on the target distance T1 , the deflection angle α, and the fourth distance L4 , the coordinates of the test point relative to the measurement origin are determined.

[0036] The technical solutions provided by the embodiments of the present disclosure include at least the following beneficial effects:

[0037] An embodiment of the present disclosure provides a vehicle test point coordinate measuring device, in which a vehicle parking platform at least partially has a rectangular plate structure, an upper surface of the vehicle parking platform has a first edge and a second edge perpendicular to each other, the intersection of the first edge and the second edge is the measurement origin of the vehicle test point coordinate measuring device, the vehicle parking platform has a slide rail structure, the slide rail structure is parallel to the first edge, a first rangefinder, a second rangefinder, and a third rangefinder are respectively slidably connected to the slide rail structure, and a processor is electrically connected to the first rangefinder, the second rangefinder, and the third rangefinder. In implementation, the midpoint of the line connecting the center point of the outer wall of the left front wheel of the vehicle and the center point of the outer wall of the right front wheel of the vehicle is used as the test point of the vehicle. The first rangefinder is used to determine the first distance L1 from the center point of the outer wall of the left front wheel of the vehicle or the center point of the outer wall of the right front wheel of the vehicle to the first edge. The second rangefinder is used to determine the second distance L2 from the first characteristic point of the vehicle to the first edge. The third rangefinder is used to determine the third distance L3 from the second characteristic point of the vehicle to the first edge. The processor is used to determine the fourth distance L4 from the first rangefinder 2 to the second edge, the fifth distance L5 from the second rangefinder to the second edge, and the sixth distance L6 from the third rangefinder to the second edge. In this way, the processor can determine the coordinates of the vehicle's test point relative to the measurement origin based on the first vehicle width value D1 corresponding to the first feature point, the second vehicle width value D2 corresponding to the second feature point, the third vehicle width value D3 corresponding to the center of the outer wall of the vehicle's front wheel, the above-mentioned first distance L1, the second distance L2, the third distance L3, the fourth distance L4, the fifth distance L5 and the sixth distance L6, and then subsequently determine the center of mass coordinates in the measuring equipment coordinate system. After that, the coordinate conversion can be directly performed according to the coordinates of the above-mentioned vehicle's test point relative to the measurement origin to obtain the center of mass coordinates in the vehicle body coordinate system. This process avoids the deviation caused by the measurement of the work tape measure, and thus can improve the accuracy of the determined center of mass coordinates in the vehicle body coordinate system.

[0038] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0040] Figure 1 1 is a schematic structural diagram of a vehicle test point coordinate measuring device according to an embodiment of the present disclosure;

[0041] Figure 2 This is a schematic diagram of the working principle of a vehicle test point coordinate measurement device shown in an embodiment of the present disclosure;

[0042] Figure 3 1 is a schematic structural diagram of a vehicle test point coordinate measuring device according to an embodiment of the present disclosure;

[0043] Figure 4 1 is a schematic structural diagram of a vehicle test point coordinate measuring device according to an embodiment of the present disclosure;

[0044] Figure 5 It is a flow chart of a method for determining the coordinates of vehicle test points shown in an embodiment of the present disclosure.

[0045] Legend

[0046] 1. Vehicle parking platform;

[0047] 11. First platform; 12. Second platform; 13. First lifting frame; 14. Second lifting frame;

[0048] 101. First edge; 102. Second edge; 103. Slide rail structure;

[0049] 1031, first slide rail; 1032, second slide rail;

[0050] 10321, first chute; 10322, second chute;

[0051] 2. First rangefinder;

[0052] 3. Second rangefinder;

[0053] 4. Third rangefinder;

[0054] 5. Processor. DETAILED DESCRIPTION

[0055] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0056] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the present disclosure belongs. The terms "first", "second", "third" and similar words used in the patent disclosure specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "one" or "a" do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Terms such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0057] Nowadays, after the production and assembly of a car is completed, measuring the center of mass coordinates in the body coordinate system is a key step in the subsequent vehicle braking test, ensuring the operational stability of the whole vehicle, and upgrading the iterative model design. At present, the torque balance method is usually used to determine the plane coordinates of the center of mass of the whole vehicle. In implementation, the vehicle body is placed on the test bench, and the load data of the four wheels of the vehicle body on the test bench are collected and calculated to obtain the center of mass coordinates of the vehicle body in the test bench coordinate system. Subsequently, the coordinates of the vehicle test point relative to the origin of the test bench are manually measured with a tape measure (the midpoint of the line connecting the center of the outer wall of the left front wheel of the vehicle and the center of the outer wall of the right front wheel of the vehicle in the industry standard is the vehicle test point) are converted into the center of mass coordinates of the vehicle in the body coordinate system. In the above process, the error of the step of manually measuring the coordinates of the vehicle test point relative to the origin of the test bench is large, which results in a low accuracy of the center of mass coordinates in the body coordinate system.

[0058] Figure 1 This is a schematic structural diagram of a vehicle test point coordinate measuring device provided by an embodiment of the present disclosure. Figure 2 FIG. 1 is a schematic diagram showing the working principle of a vehicle test point coordinate measuring device provided by an embodiment of the present disclosure. Figure 1 and Figure 2 As shown, the vehicle test point coordinate measuring device includes a vehicle parking platform 1 , a first rangefinder 2 , a second rangefinder 3 , a third rangefinder 4 and a processor 5 .

[0059] Among them, the vehicle parking platform 1 at least partially has a rectangular plate structure, the upper surface of the vehicle parking platform 1 has a first edge 101 and a second edge 102 that are perpendicular to each other, the intersection of the first edge 101 and the second edge 102 is the measurement origin of the vehicle test point coordinate measuring device, the vehicle parking platform 1 has a slide rail structure 103, the slide rail structure 103 is parallel to the first edge 101, the first rangefinder 2, the second rangefinder 3 and the third rangefinder 4 are respectively slidably connected to the slide rail structure 103, and the processor 5 is electrically connected to the first rangefinder 2, the second rangefinder 3 and the third rangefinder 4.

[0060] In implementation, the midpoint of a line connecting the center point of the outer wall of the left front wheel of the vehicle and the center point of the outer wall of the right front wheel of the vehicle is used as a test point of the vehicle; the first rangefinder 2 is used to determine a first distance L1 from the center point of the outer wall of the left front wheel of the vehicle or the center point of the outer wall of the right front wheel of the vehicle to the first edge 101; the second rangefinder 3 is used to determine a second distance L2 from a first feature point of the vehicle to the first edge 101; the third rangefinder 4 is used to determine a third distance L3 from the second feature point of the vehicle to the first edge 101; and the processor 5 is used to determine a fourth distance L4 from the first rangefinder 2 to the second edge 102, a fifth distance L5 from the second rangefinder 3 to the second edge 102, and a sixth distance L6 from the third rangefinder 4 to the second edge 102.

[0061] In this way, the processor 5 can determine the coordinates of the vehicle's test point relative to the measurement origin based on the first vehicle width value D1 corresponding to the first feature point, the second vehicle width value D2 corresponding to the second feature point, the third vehicle width value D3 corresponding to the center of the outer wall of the vehicle's front wheel, the above-mentioned first distance L1, the second distance L2, the third distance L3, the fourth distance L4, the fifth distance L5 and the sixth distance L6, so that after subsequently determining the center of mass coordinates in the measuring equipment coordinate system, the coordinate conversion can be directly performed according to the coordinates of the above-mentioned vehicle test point relative to the measurement origin to obtain the center of mass coordinates in the vehicle body coordinate system. In this process, the deviation caused by manual tape measure measurement is avoided, and the accuracy of the determined center of mass coordinates in the vehicle body coordinate system can be improved.

[0062] Below, each component of the vehicle test point coordinate measurement equipment is introduced separately:

[0063] 1. Vehicle parking platform 1

[0064] The vehicle parking platform 1 is a component of the vehicle test point coordinate measuring device for parking the vehicle to be tested and arranging the slide rails.

[0065] like Figure 1As shown, the vehicle parking platform 1 at least partially has a rectangular plate structure, and the upper surface of the vehicle parking platform 1 has a first edge 101 and a second edge 102 that are perpendicular to each other. The intersection of the first edge 101 and the second edge 102 is the measurement origin of the vehicle test point coordinate measuring equipment. The vehicle parking platform 1 has a slide rail structure 103, and the slide rail structure 103 is parallel to the first edge 101.

[0066] In some possible embodiments, the vehicle parking platform 1 includes a first platform 11 and a second platform 12 . The slide rail structure 103 includes a first slide rail 1031 and a second slide rail 1032 .

[0067] like Figure 3 As shown, the vehicle parking platform 1 includes a first platform 11 and a second platform 12. The first platform 11 has a rectangular plate structure. The upper surface of the first platform 11 has a first edge 101 and a second edge 102. The second platform 12 has a rectangular plate structure and is slidably connected to the side wall of the first platform 11 where the first edge 101 is located.

[0068] like Figure 3 As shown, the slide rail structure 103 includes a first slide rail 1031 and a second slide rail 1032. The first slide rail 1031 is located on the first edge 101 and is parallel to the first edge 101. The second slide rail 1032 is located on the upper surface of the second platform 12 and is parallel to the first edge 101. In practice, the first rangefinder 2 is slidably connected to the first slide rail 1031, and the second rangefinder 3 and the third rangefinder 4 are slidably connected to the second slide rail 1032, respectively.

[0069] The materials of the first platform 11 and the second platform 12 may be the same or different. For example, the first platform 11 may be made of stainless steel, and the second platform 12 may be made of aluminum. Alternatively, both the first platform 11 and the second platform 12 may be made of stainless steel.

[0070] Optionally, a plurality of pulleys (not shown) may be provided on the lower surface of the first platform 11. The pulleys are in contact with the ground and are rotatably connected to the second platform 12. During movement of the second platform 12, the wall surface of the second platform 12 adjacent to the first platform 11 abuts against the side wall of the first platform 11 where the first edge 101 is located. In this way, by moving the second platform 12, the position of the second slide rail 1032 can be adjusted, facilitating the second rangefinder 3 and the third rangefinder 4 to locate a feature point on the vehicle side wall.

[0071] In an example, the first slide rail 1031 and the second slide rail 1032 are both electric slide rails, and are both electrically connected to the processor 5 .

[0072] In implementation, the first rangefinder 2 is slidably connected to the first slide rail 1031, and the first slide rail 1031 can obtain the position of the first rangefinder 2 in real time. Based on the position of the first rangefinder 2, the fourth distance L4 from the first rangefinder 2 to the second edge 102 is determined, and a first distance signal including a specific value corresponding to the fourth distance L4 is sent to the processor 5. The first distance signal also includes a timestamp of the first slide rail 1031 determining the position of the first rangefinder 2. Correspondingly, the second rangefinder 3 and the third rangefinder 4 are respectively slidably connected to the second slide rail 1032, and the second slide rail 1032 can obtain the position of the second rangefinder 3 in real time. The processor 5 then determines the position of the second rangefinder 3 and the position of the third rangefinder 4, determines a fifth distance L5 between the second rangefinder 3 and the second edge 102 based on the position of the second rangefinder 3, and determines a sixth distance L6 between the third rangefinder 4 and the second edge 102 based on the position of the third rangefinder 4. The processor 5 then sends a second distance signal including a specific value corresponding to the fifth distance L5 and a third distance signal including a specific value corresponding to the sixth distance L6 to the processor 5. The second distance signal also includes a timestamp of when the second slide rail 1032 determined the position of the second rangefinder 3, and the third distance signal also includes a timestamp of when the second slide rail 1032 determined the position of the third rangefinder 4. After receiving the first, second, and third distance signals, the processor 5 may store these signals in a chronological order according to the corresponding timestamps.

[0073] In this way, the processor 5 can directly determine the specific values ​​of the fourth distance L4, the fifth distance L5 and the sixth distance L6 through the first slide rail 1031 and the second slide rail 1032, which is convenient for subsequent direct determination of the coordinates of the test point relative to the measurement origin.

[0074] In some possible embodiments, the second sliding rail 1032 includes a first sliding groove 10321 and a second sliding groove 10322 .

[0075] like Figure 4 As shown, the second slide rail 1032 includes a first slide groove 10321 and a second slide groove 10322. The first slide groove 10321 is located on the side of the second slide groove 10322 away from the first platform 11. The first slide groove 10321 and the second slide groove 10322 are arranged at intervals in the extension direction of the second edge 102 and are both parallel to the first edge 101.

[0076] In one example, the second rangefinder 3 is slidably connected to the first slide groove 10321, and the third rangefinder 4 is slidably connected to the second slide groove 10322. In this way, the second rangefinder 3 and the third rangefinder 4 are slidably connected to different slide grooves, respectively, and the order of the two in the extension direction of the first edge 101 is adjustable, which can improve operational flexibility.

[0077] In one example, the second rangefinder 3 is slidably connected to the first slide groove 10321 and the second slide groove 10322, respectively, and the third rangefinder 4 is slidably connected to the first slide groove 10321 and the second slide groove 10322, respectively. In this way, the second rangefinder 3 and the third rangefinder 4 are both slidably connected using dual slide rails, which can improve the stability of the second rangefinder 3 and the third rangefinder 4 when sliding.

[0078] Optionally, the vehicle parking platform 1 may further include a first lifting frame 13 and a second lifting frame 14 .

[0079] In one example, Figure 4 As shown, the lower surfaces of the first lifting frame 13 and the second lifting frame 14 each have two sliding protrusion structures, which are respectively located in the first slide groove 10321 and the second slide groove 10322, and are respectively slidably connected to the first slide groove 10321 and the second slide groove 10322. The second rangefinder 3 is connected to the upper surface of the first lifting frame 13, and the third rangefinder 4 is connected to the upper surface of the second lifting frame 14.

[0080] In implementation, the first lifting frame 13 can be used to adjust the vertical height of the second rangefinder 3, and the second lifting frame 14 can be used to adjust the vertical height of the third rangefinder 4. The second rangefinder 3 and the third rangefinder 4 have the same vertical height.

[0081] 2. First Rangefinder 2, Second Rangefinder 3, and Third Rangefinder 4

[0082] The first distance meter 2 , the second distance meter 3 and the third distance meter 4 are components in the vehicle test point coordinate measuring device for measuring the distance from the vehicle body to the first edge 101 .

[0083] like Figure 1 As shown, the first rangefinder 2 , the second rangefinder 3 and the third rangefinder 4 are all slidably connected to the slide rail structure 103 on the vehicle parking platform 1 .

[0084] In one example, the slide rail structure 103 includes a first slide rail 1031 and a second slide rail 1032. The first rangefinder 2 is slidably connected to the first slide rail 1031, and the second rangefinder 3 and the third rangefinder 4 are respectively slidably connected to the second slide rail 1032. The specific connection method of the first rangefinder 2, the second rangefinder 3, and the third rangefinder 4 to the slide rail structure 103 can be referred to the above description and will not be repeated here.

[0085] In some possible embodiments, the first rangefinder 2 , the second rangefinder 3 , and the third rangefinder 4 are all laser rangefinders.

[0086] A laser rangefinder consists of a laser, a photodetector, a scanning mirror, and a signal processor. The laser emits a laser beam, the photodetector converts the laser beam reflected from the object being measured into an electrical signal, and the signal processor analyzes and processes the electrical signal received by the photodetector to determine the distance between the object being measured and the laser rangefinder.

[0087] For example, the first rangefinder 2, the second rangefinder 3, and the third rangefinder 4 are all green light rangefinders. Green light rangefinders have a shorter wavelength and higher measurement accuracy, which can improve the measurement accuracy of the vehicle test point coordinate measurement device.

[0088] In one example, the vertical projections of the lasers of the first rangefinder 2, the second rangefinder 3, and the third rangefinder 4 are all located on the first edge 101. In this way, the distance from the laser to the object being measured is the distance from the object being measured to the first edge 101, which can improve the measurement accuracy of the vehicle test point coordinate measurement device.

[0089] 3. Processor 5

[0090] The processor 5 is a component in the vehicle test point coordinate measuring device for receiving signals and determining the coordinates of the test point relative to the measurement origin.

[0091] See below. Figure 2 , the specific steps for determining the coordinates of the test point relative to the measurement origin are introduced:

[0092] Step 1: Determine the intersection O of the first edge 101 and the second edge 102 as the measurement origin. The third rangefinder 4 projects a laser beam onto the vehicle body side and tracks a first characteristic point a on the vehicle body side, determining a second distance L2 from the first characteristic point a to the first edge 101. The second rangefinder 3 projects a laser beam onto the vehicle body side and tracks a second characteristic point b on the vehicle body side, determining a third distance L3 from the second characteristic point b to the first edge 101. The first rangefinder 2 projects a laser beam onto the center M of the outer wall of the left front wheel of the vehicle, determining a first distance L1 from the center M of the outer wall of the left front wheel of the vehicle to the second edge. The slide rail structure 103 determines the sixth distance L6 from the third rangefinder 4 to the second edge 102 when the third rangefinder 4 tracks to the first characteristic point a, determines the fifth distance L5 from the second rangefinder 3 to the second edge 102 when the second rangefinder 3 tracks to the second characteristic point b, and determines the fourth distance L4 from the first rangefinder 2 to the second edge 102 when the first rangefinder 2 tracks to the center M of the outer wall of the left front wheel of the vehicle.

[0093] In practice, the first characteristic point a and the second characteristic point b on the vehicle side can be groove structures or raised structures. The third rangefinder 4 can track the first characteristic point a on the vehicle body by being controlled by the processor 5. The processor 5 controls the movement of the third rangefinder 4. When the laser beam is irradiated on the first characteristic point a, the third rangefinder 4 detects a jump in the distance L2, thereby confirming that the laser beam has tracked to the first characteristic point a. The process of the second rangefinder 3 tracking the second characteristic point b on the vehicle body and the first rangefinder 2 tracking the center point M of the outer wall of the left front wheel of the vehicle is similar to the above process and will not be repeated here. Of course, the process of the third rangefinder 4 tracking the first characteristic point a on the vehicle body and the second rangefinder 3 tracking the second characteristic point b on the vehicle body can also be achieved by manually moving the third rangefinder 4 and the second rangefinder 3.

[0094] The third rangefinder 4, the second rangefinder 3, and the first rangefinder 2 are all slidably connected to the slide rail structure 103, which is electrically connected to the processor 5. The slide rail structure 103 is used to obtain the position of the first rangefinder 2 in real time, determine the fourth distance L4 between the first rangefinder 2 and the second edge 102 based on the position of the first rangefinder 2, and send a first distance signal including a specific value corresponding to the fourth distance L4 to the processor 5. The slide rail structure 103 obtains the position of the second rangefinder 3 and the third rangefinder 4 in real time, determines the fifth distance L5 between the second rangefinder 3 and the second edge 102 based on the position of the second rangefinder 3, determines the sixth distance L6 between the third rangefinder 4 and the second edge 102 based on the position of the third rangefinder 4, and sends the second distance signal including the specific value corresponding to the fifth distance L5 and the third distance signal including the specific value corresponding to the sixth distance L6 to the processor 5.

[0095] Step 2: Receive the first vehicle width value D1 corresponding to the first feature point a, the second vehicle width value D2 corresponding to the second feature point b, and the third vehicle width value D3 corresponding to the center of the outer wall of the front wheel of the vehicle, connect the first feature point a and the second feature point b to obtain a line segment ab, draw a first perpendicular line ac of the line segment ab through the first feature point a to the other side wall of the vehicle body, and the length of the first perpendicular line ac is half of the first vehicle width value D1. Correspondingly, draw a second perpendicular line bd of the line segment ab through the second feature point b to the other side wall of the vehicle body, and the length of the second perpendicular line bd is half of the second vehicle width value D2. Connect the above-mentioned points b and d and extend them so that the straight line where bd is located intersects with the line connecting the center of the outer wall of the left front wheel of the vehicle and the center of the outer wall of the right front wheel of the vehicle, to obtain an intersection O1. The intersection O1 is the test point of the vehicle, and the straight line where bd is located is the second horizontal axis of the vehicle body coordinate system.

[0096] In implementation, the above-mentioned first vehicle width value D1, the second vehicle width value D2 corresponding to the second characteristic point b, and the third vehicle width value D3 corresponding to the center of the outer wall of the vehicle's front wheel can be directly obtained by querying the vehicle's factory parameters, or can be obtained by technicians through auxiliary tooling measurements.

[0097] In step three, the processor 5 receives the second distance L2, the third distance L3, the fifth distance L5 and the sixth distance L6, and calculates the deflection angle α of the vehicle's forward direction (i.e., the second horizontal axis corresponding to the vehicle body coordinate system) relative to the first edge 101 (i.e., the first horizontal axis corresponding to the measuring device) according to the formula tanα=(L3-L2) / (L6-L5).

[0098] In step 4, the processor 5 draws a perpendicular line to the first horizontal axis through the center M of the outer wall of the left front wheel and intersects it with the second horizontal axis. The intersection is recorded as point e. Point e and point O1 are connected to obtain a line segment O1e. According to the third vehicle width value D3 corresponding to the center of the outer wall of the front wheel of the vehicle, the deflection angle α and the formula tanα=2O1e / D3, the length of O1e is calculated to be (D3·tanα) / 2. The distance from point O1 to the second edge 102 is calculated by trigonometric function to be [(D3·sinα) / 2+L4], and the distance from O1 to the first edge 101 is [(D3·cosα) / 2+L1], and the coordinates of point O1 (the test point of the vehicle) relative to point O (the measurement origin) are determined.

[0099] The coordinates of the vehicle test point determined above relative to the measurement origin of the vehicle test point coordinate measuring device can be used for coordinate conversion, and then the center of mass coordinates in the vehicle body coordinate system can be directly obtained after the center of mass coordinates in the measuring device coordinate system are subsequently determined.

[0100] The technical solutions provided by the embodiments of the present disclosure include at least the following beneficial effects:

[0101] An embodiment of the present disclosure provides a vehicle test point coordinate measuring device, in which a vehicle parking platform 1 at least partially has a rectangular plate structure, an upper surface of the vehicle parking platform 1 has a first edge 101 and a second edge 102 perpendicular to each other, and the intersection of the first edge 101 and the second edge 102 is the measurement origin of the vehicle test point coordinate measuring device, the vehicle parking platform 1 has a slide rail structure 103, the slide rail structure 103 is parallel to the first edge 101, the first rangefinder 2, the second rangefinder 3 and the third rangefinder 4 are respectively slidably connected to the slide rail structure 103, and the processor 5 is electrically connected to the first rangefinder 2, the second rangefinder 3, and the third rangefinder 4. In implementation, the midpoint of a line connecting the center point of the outer wall of the left front wheel of the vehicle and the center point of the outer wall of the right front wheel of the vehicle is used as a test point of the vehicle; the first rangefinder 2 is used to determine a first distance L1 from the center point of the outer wall of the left front wheel of the vehicle or the center point of the outer wall of the right front wheel of the vehicle to the first edge 101; the second rangefinder 3 is used to determine a second distance L2 from a first feature point of the vehicle to the first edge 101; the third rangefinder 4 is used to determine a third distance L3 from the second feature point of the vehicle to the first edge 101; and the processor 5 is used to determine a fourth distance L4 from the first rangefinder 2 to the second edge 102, a fifth distance L5 from the second rangefinder 3 to the second edge 102, and a sixth distance L6 from the third rangefinder 4 to the second edge 102. In this way, the processor 5 can determine the coordinates of the vehicle's test point relative to the measurement origin based on the first vehicle width value D1 corresponding to the first feature point, the second vehicle width value D2 corresponding to the second feature point, the third vehicle width value D3 corresponding to the center of the outer wall of the vehicle's front wheel, the above-mentioned first distance L1, the second distance L2, the third distance L3, the fourth distance L4, the fifth distance L5 and the sixth distance L6, so that after subsequently determining the center of mass coordinates in the measuring equipment coordinate system, the coordinate conversion can be directly performed according to the coordinates of the above-mentioned vehicle test point relative to the measurement origin to obtain the center of mass coordinates in the vehicle body coordinate system. In this process, the deviation caused by the manual tape measure measurement is avoided, and the accuracy of the determined center of mass coordinates in the vehicle body coordinate system can be improved.

[0102] The present disclosure provides a method for determining the coordinates of a vehicle test point, such as Figure 2 The processing flow of the method is shown, which may include the following steps:

[0103] Step 501 : Determine a first coordinate system and a measurement origin corresponding to a measuring device based on the first edge 101 and the second edge 102 of the vehicle parking platform 1 .

[0104] The first coordinate system includes a first horizontal axis and a first vertical axis.

[0105] In step 502, a second coordinate system corresponding to the vehicle and a test point are determined based on the first feature point of the vehicle, the first vehicle distance value D1 corresponding to the first feature point, the second feature point of the vehicle, the second vehicle distance value D2 corresponding to the second feature point, and the left front wheel outer wall center of the vehicle.

[0106] The second coordinate system includes a second horizontal axis and a second vertical axis.

[0107] In step 503, a sixth distance L6 from the third distance meter 4 to the first vertical axis is determined, and a second distance L2 from the first feature point to the first horizontal axis is determined.

[0108] In step 504, a fifth distance L5 from the second distance meter 3 to the first vertical axis is determined, and a third distance L3 from the second feature point to the first horizontal axis is determined.

[0109] In step 505, a fourth distance L4 from the first distance meter 2 to the first vertical axis is determined, and a first distance L1 from the left front wheel outer wall center of the vehicle to the first horizontal axis is determined.

[0110] In step 506, a target distance T1 from the third feature point of the vehicle to the test point is determined.

[0111] The third feature point is the intersection point of the reverse extension line of the perpendicular line from the left front wheel outer wall center of the vehicle to the first horizontal axis and the second horizontal axis.

[0112] In step 507, the coordinates of the test point relative to the measurement origin are determined based on the sixth distance L6, the fifth distance L5, the fourth distance L4, the third distance L3, the second distance L2, the first distance L1, and the target distance T1.

[0113] The specific process of determining the coordinates of the test point relative to the measurement origin based on the sixth distance L6, the fifth distance L5, the fourth distance L4, the third distance L3, the second distance L2, the first distance L1, and the target distance T1 is described above, and will not be repeated here.

[0114] The above only describes optional embodiments of the present disclosure, and is not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A vehicle test point coordinate measuring device, characterized in that: The vehicle test point coordinate measuring device comprises a vehicle parking platform (1), a first distance meter (2), a second distance meter (3), a third distance meter (4) and a processor (5); The vehicle parking platform (1) at least partially has a rectangular plate structure, the upper surface of the vehicle parking platform (1) has a first edge (101) and a second edge (102) perpendicular to each other, and the vehicle parking platform (1) has a slide rail structure (103), and the slide rail structure (103) is parallel to the first edge (101); The first distance meter (2) is slidably connected to the slide rail structure (103) and is used to determine a first distance L1 from the center of the outer wall of the left front wheel of the vehicle or the center of the outer wall of the right front wheel of the vehicle to the first edge (101), wherein the intersection of the first edge (101) and the second edge (102) is the measurement origin of the vehicle test point coordinate measuring device, and the midpoint of the line connecting the center of the outer wall of the left front wheel of the vehicle and the center of the outer wall of the right front wheel of the vehicle is the test point of the vehicle; The third distance meter (4) is slidably connected to the slide rail structure (103) and is used to determine a second distance L2 from a first characteristic point of the vehicle to the first edge (101); The second distance meter (3) is slidably connected to the slide rail structure (103) and is used to determine a third distance L3 from a second characteristic point of the vehicle to the first edge (101); The processor (5) is electrically connected to the first rangefinder (2), the second rangefinder (3), and the third rangefinder (4), and is used to determine a fourth distance L4 from the first rangefinder (2) to the second edge (102), a fifth distance L5 from the second rangefinder (3) to the second edge (102), and a sixth distance L6 from the third rangefinder (4) to the second edge (102), and to determine the coordinates of the test point relative to the measurement origin based on a first vehicle width value D1 corresponding to the first feature point, a second vehicle width value D2 corresponding to the second feature point, a third vehicle width value D3 corresponding to the center of the outer wall of the front wheel of the vehicle, the first distance L1, the second distance L2, the third distance L3, the fourth distance L4, the fifth distance L5, and the sixth distance L6.

2. The vehicle test point coordinate measuring device according to claim 1, characterized in that: The vehicle parking platform (1) comprises a first platform body (11) and a second platform body (12); the slide rail structure (103) comprises a first slide rail (1031) and a second slide rail (1032); The first platform (11) has a rectangular plate-shaped structure, the upper surface of the first platform (11) has the first edge (101) and the second edge (102), the first slide rail (1031) is located on the first edge (101) and is parallel to the first edge (101), and the first rangefinder (2) is slidably connected to the first slide rail (1031); The second platform (12) has a rectangular plate-like structure and is slidably connected to the side wall of the first platform (11) where the first edge (101) is located. The upper surface of the second platform (12) has a second slide rail (1032), and the second slide rail (1032) is parallel to the first edge (101). The second rangefinder (3) and the third rangefinder (4) are respectively slidably connected to the second slide rail (1032).

3. The vehicle test point coordinate measuring device according to claim 2, characterized in that: The first slide rail (1031) and the second slide rail (1032) are both electric slide rails; The first slide rail (1031) is electrically connected to the processor (5) and is used to send a first distance signal to the processor (5), wherein the first distance signal includes a value of the fourth distance L4; The second slide rail (1032) is electrically connected to the processor (5) and is used to send a second distance signal and a third distance signal to the processor (5), wherein the second distance signal includes a value of the fifth distance L5, and the third distance meter (4) includes a value of the sixth distance L6.

4. The vehicle test point coordinate measuring device according to claim 2, characterized in that: The second slide rail (1032) includes a first slide groove (10321) and a second slide groove (10322), wherein the first slide groove (10321) and the second slide groove (10322) are arranged at intervals in the extension direction of the second edge (102), and are both parallel to the first edge (101).

5. The vehicle test point coordinate measuring device according to claim 4, characterized in that: The second rangefinder (3) is slidably connected to the first slide groove (10321), and the third rangefinder (4) is slidably connected to the second slide groove (10322).

6. The vehicle test point coordinate measuring device according to claim 4, characterized in that: The vehicle parking platform (1) further comprises a first lifting frame (13) and a second lifting frame (14), wherein the lower surfaces of the first lifting frame (13) and the second lifting frame (14) each have two sliding protrusion structures, wherein the two sliding protrusion structures are respectively located in the first chute (10321) and the second chute (10322), and are respectively slidably connected to the first chute (10321) and the second chute (10322); The second rangefinder (3) is connected to the upper surface of the first lifting frame (13); The third rangefinder (4) is connected to the upper surface of the second lifting frame (14).

7. The vehicle test point coordinate measuring device according to claim 1, characterized in that: The first rangefinder (2), the second rangefinder (3) and the third rangefinder (4) are all laser rangefinders.

8. The vehicle test point coordinate measuring device according to claim 7, characterized in that: The projections of the lasers of the first rangefinder (2), the second rangefinder (3) and the third rangefinder (4) in the vertical direction are all located on the first edge (101).

9. A method for determining the coordinates of a vehicle test point, characterized in that: The method is applied to a vehicle test point coordinate measuring device, and the method comprises: Based on a first edge (101) and a second edge (102) of the vehicle parking platform (1), determining a first coordinate system and a measurement origin corresponding to the measuring device, wherein the first coordinate system includes a first horizontal axis and a first vertical axis; Determining a second coordinate system and a test point corresponding to the vehicle based on a first characteristic point of the vehicle, a first vehicle width value D1 corresponding to the first characteristic point, a second characteristic point of the vehicle, a second vehicle width value D2 corresponding to the second characteristic point, and the center of an outer wall of a left front wheel of the vehicle, wherein the second coordinate system includes a second horizontal axis and a second vertical axis; determining a sixth distance L6 from a third distance meter (4) to the first longitudinal axis, and determining a second distance L2 from the first feature point to the first transverse axis; Determining a fifth distance L5 from the second distance meter (3) to the first longitudinal axis, and determining a third distance L3 from the second feature point to the first transverse axis; Determining a fourth distance L4 from the first distance meter (2) to the first longitudinal axis, and determining a first distance L1 from the center of the outer wall of the left front wheel of the vehicle to the first transverse axis; Determine a target distance T1 from a third characteristic point of the vehicle to the test point, wherein the third characteristic point is the intersection of the second horizontal axis and the reverse extension of a perpendicular line from the center of the outer wall of the left front wheel of the vehicle to the first horizontal axis; The coordinates of the test point relative to the measurement origin are determined based on the sixth distance L6 , the fifth distance L5 , the fourth distance L4 , the third distance L3 , the second distance L2 , the first distance L1 , and the target distance T1 .

10. The method according to claim 9, characterized in that The determining, based on the sixth distance L6, the fifth distance L5, the fourth distance L4, the third distance L3, the second distance L2, the first distance L1, and the target distance T1, the coordinates of the test point relative to the measurement origin includes: determining a deflection angle α of the second transverse axis relative to the first transverse axis based on the sixth distance L6, the fifth distance L5, the second distance L2, and the third distance L3; Determining the target distance T1 based on the deflection angle α and a third vehicle width value D3 corresponding to the center of the outer wall of the front wheel of the vehicle; Based on the target distance T1 , the deflection angle α, and the fourth distance L4 , the coordinates of the test point relative to the measurement origin are determined.

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