A calibration target and a K&C test method based on the calibration target

Abstract

The present application discloses a calibration target and a K&C test method based on the calibration target, and relates to the technical field of K&C test, including using the calibration target to set the initial values ​​of the wheel center displacement sensors on the outer sides of the four corner platforms of the K&C test bench. The four wheels of the vehicle are placed on the upper surfaces of the four corner platforms of the K&C test bench respectively, and the connecting plates of each wheel center displacement sensor are connected to the wheel hubs of the corresponding tires, and then the K&C test is performed, and the absolute value and change value of the toe angle of the corresponding tire, as well as the absolute value and change value of the camber angle are obtained through the wheel center displacement sensor. The present application sets the initial absolute values ​​of the toe angle and camber angle of the wheel center displacement sensor on the outer side of the corner platform by installing the calibration target on the upper surface of the corner platform of the K&C test, and using the different angles between the circular plate in the calibration target and the vertical surface, so that the absolute value and change value of the toe angle and camber angle can be obtained through the K&C test bench, and the coordinate system of different test equipment and methods is realized.

Description

Technical Field

[0001] The present application relates to the technical field of K&C test, and in particular to a calibration target and a K&C test method based on the calibration target. Background Art

[0002] When we look at the vehicle from the front or rear, the wheels are not necessarily completely perpendicular to the ground, but form a small angle with the ground, which is the camber of the wheels. Generally speaking, it is not easy to detect unless you observe carefully. When looking from the front (rear), if the two wheels are in a straight eight-shaped shape (also called an outer eight), it is a negative camber setting. If the two wheels are completely perpendicular to the ground, it is a zero camber setting. If they are in an inverted eight-shaped shape (also called an inner eight), it is a positive camber setting.

[0003] In general, the front wheels of front-engine front-drive (FF) vehicles have a 0-degree inclination or a slight positive inclination, and the rear wheels have a certain degree of negative inclination. Under load, the front wheels will form an ideal straight-line walking state with a 0-degree inclination due to the inclination gain (CamberGain). Under the 0-degree inclination state, the contact area between the tire and the ground reaches the maximum, and the acceleration and braking performance are also optimal. The rear wheels of front-engine front-drive vehicles have a lighter load and are not responsible for driving the vehicle, so the burden of braking is relatively light. A certain degree of negative inclination setting can increase the tire contact area in the bend and enhance the cornering stability, and the degree of inner eccentric wear caused by the negative inclination is quite slight.

[0004] Switching to high-performance rear-wheel drive or four-wheel drive models, you can clearly see that all four wheels have a certain degree of negative camber. The purpose is quite obvious, which is also to increase the contact area and stability during intense maneuvers.

[0005] It is ideal for a car to have a camber angle close to 0 when going straight and a negative camber angle when turning to help it through the corner. Therefore, there is a special design of camber gain in the car suspension. This means that the wheel does not move completely vertically upward after being under pressure, but the more it moves upward, the greater the negative camber angle will be. In the world's top Formula One racing cars, the front wheels have a significant negative camber angle setting in order to cope with fast and fierce corners, while the rear wheels have no obvious camber angle because they are drive wheels. Moreover, the size of the car's camber angle setting is related to the type of track curves and the proportion of the curves.

[0006] In addition, when looking down at the car from above, the four wheels are not placed completely parallel to each other as expected, but are arranged at a slight angle between the two front wheels or the two rear wheels. However, this angle is very small and cannot be distinguished by the naked eye. The function of the toe angle is to compensate for the tendency of the tire to roll inward or outward due to the camber angle and road resistance, ensure the straight-forward performance of the car, and avoid uneven tire wear.

[0007] The toe setting where the distance between the two wheels in front is smaller than the distance at the rear is called the toe-in angle. Toe is the tip of the foot, which can be figuratively compared to a person's pigeon-toed feet. Conversely, the toe setting where the distance between the two wheels in front is larger than the distance at the rear is called the toe-out angle, which is similar to a person's pigeon-toed feet.

[0008] The four-wheel alignment parameters of a car, such as toe angle and camber angle, directly affect the driving comfort and operational stability of the vehicle. There are two main test equipment and methods involved in testing this indicator: the four-wheel aligner and the K&C test bench (static K&C).

[0009] The four-wheel alignment measures the absolute values ​​of the toe angle and camber angle of the vehicle in a certain static posture (load). The K&C test conducted on the K&C test bench measures the changes in the toe angle and camber angle of the vehicle under continuously changing postures (loads), and it cannot measure the absolute values ​​of the toe angle and camber angle.

[0010] The benchmarks of the above two test data are different. How to base the two test data on the same coordinate system to achieve data unification from the entire process of simulation, design, and testing, and facilitate reading and comparison by upstream and downstream users is a technical problem that needs to be solved urgently. Summary of the invention

[0011] In view of the defects existing in the prior art, the purpose of the present application is to provide a calibration target and a K&C test method based on the calibration target, which uses the different angles between the circular plate and the vertical plane in the calibration target to set the initial absolute values ​​of the toe angle and camber angle of the wheel center displacement sensor on the outer side of the angle platform, so that the absolute value and change value of the toe angle and camber angle can be obtained through the K&C test bench, thereby realizing the coordinate system of different test equipment and methods.

[0012] In order to achieve the above objectives, the technical solutions adopted are:

[0013] The first aspect of the present application provides a calibration target, comprising:

[0014] A calibration target, characterized in that it comprises a target base and an insertion rod;

[0015] The target base comprises a bottom panel and a vertical panel which are perpendicular to each other, the edge where the bottom panel and the vertical panel meet is a junction edge, the bottom panel is provided with a plurality of first mounting holes and a plurality of first plugging holes, and the vertical panel is provided with a plurality of second plugging holes;

[0016] The insertion rod comprises a vertical rod, a circular plate is arranged on the top of the vertical rod, and a plurality of pins are arranged on the bottom of the vertical rod, and the sizes of the pins are matched with the first plugging hole and the second plugging hole respectively.

[0017] In some embodiments, the upper surfaces of the corner platforms of the K&C test bench are all square;

[0018] The bottom panel and the vertical panel are both rectangular panels, the length of the intersection edge is twice the length of the side on the upper surface of the corner platform, and the length of all side edges of the bottom panel and the vertical panel perpendicular to the intersection edge is equal to the length of the side on the upper surface of the corner platform.

[0019] In some embodiments, the bottom panel has the plurality of first mounting holes on one side and the plurality of first plugging holes on the other side, the side of the bottom panel perpendicular to the intersection and adjacent to the plurality of first mounting holes is the first outer side, and the side of the bottom panel perpendicular to the intersection and adjacent to the plurality of first plugging holes is the first inner side;

[0020] The side of the vertical panel that is perpendicular to the intersection edge and connected to the first outer side is the second outer side, and the side of the vertical panel that is perpendicular to the intersection edge and connected to the first inner side is the second inner side. The plurality of second plug holes are provided on one side of the vertical panel close to the first inner side.

[0021] In some embodiments, the plurality of first plug holes include a first hole, a second hole, a third hole, a fourth hole, a fifth hole, a sixth hole and a seventh hole, and the first hole, the second hole, the third hole, the fourth hole, the fifth hole and the sixth hole are all located on a circle with the seventh hole as the center and a radius of 5 cm;

[0022] The seventh hole is located at the center of a line segment parallel to the first outer side and 10 cm away;

[0023] The angle between the line connecting the first hole and the seventh hole and the first outer side is 15°;

[0024] The angle between the line connecting the second hole and the seventh hole and the first outer side is 60°;

[0025] The angle between the line connecting the third hole and the seventh hole and the first outer side is 75°;

[0026] The angle between the line connecting the fourth hole and the seventh hole and the first outer side is 105°;

[0027] The angle between the line connecting the fifth hole and the seventh hole and the first outer side is 120°;

[0028] The angle between the line connecting the sixth hole and the seventh hole and the first outer side is 165°.

[0029] In some embodiments, the plurality of second plug holes include an eighth hole, a ninth hole, a tenth hole, an eleventh hole, a twelfth hole, a thirteenth hole, and a fourteenth hole, and the eighth hole, the ninth hole, the tenth hole, the eleventh hole, the twelfth hole, and the thirteenth hole are all located on a circle with the fourteenth hole as the center and a radius of 5 cm;

[0030] The fourteenth hole is at the center of a line segment parallel to the second outer side and 10 cm away;

[0031] The angle between the line connecting the eighth hole and the fourteenth hole and the first outer side is 15°;

[0032] The angle between the line connecting the ninth hole and the fourteenth hole and the first outer side is 60°;

[0033] The angle between the line connecting the tenth hole and the fourteenth hole and the first outer side is 75°;

[0034] The angle between the line connecting the eleventh hole and the fourteenth hole and the first outer side is 105°;

[0035] The angle between the line connecting the twelfth hole and the fourteenth hole and the first outer side is 120°;

[0036] The angle between the line connecting the thirteenth hole and the fourteenth hole and the first outer side is 165°.

[0037] In some embodiments, the plurality of pin rods include a first rod, a second rod and a third rod, the first rod is coaxial with the vertical rod, and the first rod, the second rod and the third rod are distributed in an equilateral triangle;

[0038] The line connecting the second rod and the third rod is parallel to the circular plate.

[0039] In some embodiments, the length of the vertical rod is 50 cm, the length of the pin rod is 1 cm, the distance between two adjacent pin rods is 5 cm, and the radius of the circular plate is 10 cm.

[0040] A K&C test method based on a calibration target, based on the calibration target, comprising:

[0041] Using the calibration target, the initial values ​​of the wheel center displacement sensors on the outer sides of the four corner platforms of the K&C test bench are set respectively, and the initial values ​​include the toe value and the camber value;

[0042] The calibration target is removed from the K&C test bench, and the four wheels of the vehicle are placed on the upper surfaces of the four corner platforms of the K&C test bench respectively. After the connecting plate of each wheel center displacement sensor is connected to the wheel hub of the corresponding tire, the K&C test is performed to obtain the absolute value and change value of the toe angle of the corresponding tire and the absolute value and change value of the camber angle through the wheel center displacement sensor;

[0043] Each initial value setting includes:

[0044] Mounting the bottom plate of the calibration target on the upper surface of the angle platform through the plurality of first mounting holes;

[0045] The angle of the circular plate is adjusted by inserting a plurality of pins of the insertion rod into a plurality of first insertion holes of the bottom plate, and each time the angle of the circular plate is adjusted, the connecting plate of the wheel center displacement sensor of the K&C test bench is installed on the circular plate to set the toe value of the wheel center displacement sensor according to the angle of the circular plate;

[0046] The angle of the circular plate is adjusted by inserting multiple pins of the insertion rod into multiple second insertion holes of the vertical panel. Each time the angle of the circular plate is adjusted, the connecting plate of the wheel center displacement sensor of the K&C test bench is installed on the circular plate to set the camber value of the wheel center displacement sensor according to the angle of the circular plate.

[0047] In some embodiments, when the toe value of each wheel center displacement sensor is set to an initial value, the angle between the circular plate and the vertical plane is taken as the toe value of the wheel center displacement sensor;

[0048] When the initial value of the toe value of each wheel center displacement sensor is set, the angle between the circular plate and the vertical plane is taken as the camber value of the wheel center displacement sensor.

[0049] In some embodiments, when the initial value of the toe value of each wheel center displacement sensor is set, the angle of the circular plate is adjusted at least twice to set two different toe values ​​of the wheel center displacement sensor according to two different angles of the circular plate;

[0050] When the initial value of the camber value of each wheel center displacement sensor is set, the angle of the circular plate is adjusted at least twice to set two different camber values ​​of the wheel center displacement sensor according to two different angles of the circular plate.

[0051] The beneficial effects brought about by the technical solution provided in the present application include: by installing the calibration target on the upper surface of the angle platform of the K&C test, the initial absolute values ​​of the toe angle and camber angle of the wheel center displacement sensor on the outer side of the angle platform are set by utilizing the different angles between the circular plate in the calibration target and the vertical surface, so that the absolute value and change value of the toe angle and camber angle can be obtained through the K&C test bench, thereby realizing the coordinate system of different test equipment and methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a toe angle variation curve of a vehicle under continuously changing posture (load) obtained by a K&C test bench in the prior art.

[0053] Figure 2 Schematic diagram of the structure of the target base in an embodiment of the present invention.

[0054] Figure 3 Schematic diagram of the structure of the bottom plate of the target base in an embodiment of the present invention.

[0055] Figure 4Schematic diagram of the structure of the plug rod in an embodiment of the present invention.

[0056] Figure 5 The figure is a schematic diagram of a process of setting an initial value of a wheel center displacement sensor in an embodiment of the present invention.

[0057] Reference numerals:

[0058] 1-first hole; 2-second hole; 3-third hole; 4-fourth hole; 5-fifth hole; 6-sixth hole; 7-seventh hole; 8-eighth hole; 9-ninth hole; 10-tenth hole; 11-eleventh hole; 12-twelfth hole; 13-thirteenth hole; 14-fourteenth hole; 15-target seat; 16-insertion rod; 17-bottom panel; 18-vertical panel; 19-vertical rod; 20-circular plate; 21-first rod; 22-second rod; 23-third rod. DETAILED DESCRIPTION

[0059] The present application is further described in detail below with reference to the accompanying drawings and embodiments.

[0060] K&C is the abbreviation of Kinematics & Compliance, which refers to the rigid body kinematics and elastic kinematics of automobile suspension. The K&C tire coupling test is to apply force and displacement in a known direction to the vehicle suspension through the K&C test bench to measure the relationship between the force and displacement between the center of the wheel and the tire contact point. The hardware of the K&C test bench is mainly composed of four parts: the test bench base and the body fixing module, the loading module, the measurement and control system, and the user interaction interface. The base provides rigidity support, and also facilitates the adjustment and alignment of the platform module to adapt to vehicle tests with different wheelbases and track widths, including four corner platforms. The body fixing device helps to completely fix it to the base during the test, and there are various clamping and fixing mechanisms such as hydraulic, electromagnetic and mechanical. The loading module is mainly used to apply displacement and force to the wheel, including the loading platform and power source. The measurement and control system mainly controls the movement of the wheel and acquires data. The acquired data is stored or output to the host computer after corresponding conversion processing, including a wheel center displacement sensor set on the outside of the angle platform for measuring the wheel toe angle and camber angle. The wheel center displacement sensor includes a mechanical arm, a connecting plate connected to the mechanical arm, and multiple sensors set at the junction of the mechanical arm and the connecting plate. Multiple sensors can measure the change value of the tire toe angle and camber angle during the K&C test. The user interaction interface is mainly used to provide users with various switch control buttons and control screens to control the test operation, and can also observe the operating status of each major equipment.

[0061] like Figure 1The figure shows the toe angle variation curve of a vehicle under a continuously changing posture (load) collected by a wheel center displacement sensor when performing a K&C test based on the prior art. In the figure, the X-axis is the distance or displacement value of the wheel moving up and down, and the Y-axis is the toe angle variation. The wheel center displacement sensor in the current K&C test bench cannot measure the absolute value of the toe angle and camber angle of the vehicle under a static posture (load), that is, it is impossible to know Figure 1 What is the starting value of the middle Y axis? Before the vehicle undergoes the K&C test, it is necessary to do a four-wheel alignment. The four-wheel alignment measures the absolute values ​​of the toe angle and camber angle of the vehicle under a certain static posture (load). In other words, because the four-wheel alignment cannot measure the changing trend of the toe angle and camber angle of the vehicle under a continuously changing posture (load) (because the four-wheel alignment equipment cannot apply vertical and horizontal forces to the wheels of the vehicle like the K&C test bench to change the wheels and then measure the changing values ​​of the toe angle and camber angle), it is necessary to do the K&C test again.

[0062] For the above reasons, the current toe angle and camber angle tests require the use of two sets of equipment, a four-wheel alignment bench and a K&C test bench. By combining the test results of the two devices, the data based on different time and angle coordinate systems are artificially converted to the same coordinate system for test result analysis.

[0063] If the K&C test bench can continuously measure the absolute values ​​of the vehicle's toe angle and camber angle, then Figure 1 The value of the vertical coordinate Y-axis is a real value, and it can also reflect the trend of change, making it more intuitive and convenient for R&D technicians. R&D technicians do not need to look at the K&C test data in conjunction with the four-wheel alignment test data, and they can also discover abnormal data in time and analyze and find the causes in time.

[0064] like Figures 2 to 4 As shown, an embodiment of the present invention provides a calibration target, including a target base 15 and an insertion rod 16 .

[0065] The target base 15 includes a bottom panel 17 and a vertical panel 18 which are perpendicular to each other. The edge where the bottom panel 17 and the vertical panel 18 meet is a junction edge. The bottom panel 17 is provided with a plurality of first mounting holes and a plurality of first plugging holes, and the vertical panel 18 is provided with a plurality of second plugging holes.

[0066] The insertion rod 16 includes a vertical rod 19, a circular plate 20 is provided on the top of the vertical rod 19, and a plurality of pins are provided on the bottom of the vertical rod 19, and the sizes of the pins match the first plug-in hole and the second plug-in hole respectively.

[0067] In this embodiment, the distribution positions of the plurality of first plug holes on the bottom panel 17 are the same as the distribution positions of the plurality of second plug holes on the vertical panel 18. The plurality of pins at the bottom of the plug rod 16 are inserted into different first plug holes in the bottom panel 17, so that the circular plate 20 at the top of the plug rod 16 can have different deflection angles, and the deflection angle of the circular plate 20 can be obtained according to the structure of the target base 15 and the plug rod 16.

[0068] The multiple pins at the bottom of the insertion rod 16 are inserted into different first plug-in holes in the vertical panel 18, so that the circular plate 20 at the top of the insertion rod 16 can have different deflection angles, and the deflection angle of the circular plate 20 can be obtained according to the structure of the target seat 15 and the insertion rod 16.

[0069] In a preferred embodiment, the upper surfaces of the corner platforms of the K&C test bench are all square and the upper surfaces of the corner platforms are arranged horizontally.

[0070] The bottom panel 17 and the vertical panel 18 are both rectangular panels, the length of the intersection edge is twice the length of the side on the upper surface of the corner platform, and the length of all side edges of the bottom panel 17 and the vertical panel 18 perpendicular to the intersection edge is equal to the length of the side on the upper surface of the corner platform.

[0071] In this embodiment, the bottom panel 17 is Figure 2 The rectangle ABCD in the figure, the facade panel 18 is Figure 3 CDEF in the figure has the intersection side CD. Taking a square with a corner platform of about 50 cm as an example, the length of the side CD of the target base 15 is about 100 cm, and the length of the side AB is about 50 cm.

[0072] In a preferred embodiment, the bottom panel 17 is provided with the plurality of first mounting holes on one side (all holes in the bottom panel 17 except the first hole 11 to the seventh hole 77 are first mounting holes), and the other side is provided with the plurality of first plugging holes. The side of the bottom panel 17 that is perpendicular to the intersection edge and adjacent to the plurality of first mounting holes is the first outer side, and the side of the bottom panel 17 that is perpendicular to the intersection edge and adjacent to the plurality of first plugging holes is the first inner side.

[0073] The side of the vertical panel 18 that is perpendicular to the intersection edge and connected to the first outer side is the second outer side, and the side of the vertical panel 18 that is perpendicular to the intersection edge and connected to the first inner side is the second inner side. The vertical panel 18 is provided with the plurality of second plug holes on one side close to the first inner side.

[0074] In this embodiment, the first outer side is side AD, the first inner side is side BC, the second outer side is side DE, and the second outer side is side CF.

[0075] In a preferred embodiment, the multiple first plug-in holes include a first hole 1, a second hole 2, a third hole 3, a fourth hole 4, a fifth hole 5, a sixth hole 6 and a seventh hole 7. The first hole 1, the second hole 2, the third hole 3, the fourth hole 4, the fifth hole 5 and the sixth hole 6 are all located on a circle with the seventh hole 7 as the center and a radius of 5 cm.

[0076] The seventh hole 7 is located at the center of a line segment parallel to the first outer side and 10 cm away.

[0077] The angle between the line connecting the first hole 1 and the seventh hole 7 and the first outer side is 15°.

[0078] The angle between the line connecting the second hole 2 and the seventh hole 7 and the first outer side is 60°.

[0079] The angle between the line connecting the third hole 3 and the seventh hole 7 and the first outer side is 75°.

[0080] The angle between the connecting line of the fourth hole 4 and the seventh hole 7 and the first outer side is 105°.

[0081] The angle between the connecting line of the fifth hole 5 and the seventh hole 7 and the first outer side is 120°.

[0082] The angle between the connecting line of the sixth hole 6 and the seventh hole 7 and the first outer side is 165°.

[0083] In a preferred embodiment, the plurality of second plug-in holes include an eighth hole 8, a ninth hole 9, a tenth hole 10, an eleventh hole 11, a twelfth hole 12, a thirteenth hole 13 and a fourteenth hole 14, and the eighth hole 8, the ninth hole 9, the tenth hole 10, the eleventh hole 11, the twelfth hole 12 and the thirteenth hole 13 are all located on a circle with the fourteenth hole 14 as the center and a radius of 5 cm.

[0084] The fourteenth hole 14 is parallel to the second outer side and is at the center of a line segment 10 cm away.

[0085] The angle between the connecting line of the eighth hole 8 and the fourteenth hole 14 and the first outer side is 15°.

[0086] The angle between the line connecting the ninth hole 9 and the fourteenth hole 14 and the first outer side is 60°.

[0087] The angle between the line connecting the tenth hole 10 and the fourteenth hole 14 and the first outer side is 75°.

[0088] The angle between the line connecting the eleventh hole 11 and the fourteenth hole 14 and the first outer side is 105°.

[0089] The angle between the line connecting the twelfth hole 12 and the fourteenth hole 14 and the first outer side is 120°.

[0090] The angle between the line connecting the thirteenth hole 13 and the fourteenth hole 14 and the first outer side is 165°.

[0091] In a preferred embodiment, the plurality of pins include a first rod 21, a second rod 22 and a third rod 23, the first rod 21 is coaxial with the vertical rod 19, and the first rod 21, the second rod 22 and the third rod 23 are distributed in an equilateral triangle.

[0092] A line connecting the second rod 22 and the third rod 23 is parallel to the circular plate 20 .

[0093] In this embodiment, the second rod 22 and the third rod 23 both include an inclined portion and a vertical portion, the vertical portion is parallel to the vertical rod 19 , and the inclined portion forms an angle with the vertical rod 19 .

[0094] In a preferred embodiment, the length of the vertical rod 19 is 50 cm, the length of the pin rod is 1 cm, the distance between two adjacent pin rods is 5 cm, and the radius of the circular plate 20 is 10 cm.

[0095] The embodiment of the present invention further provides a K&C test method based on a calibration target, comprising:

[0096] Using the calibration targets, initial values ​​are set for the wheel center displacement sensors on the outer sides of the four corner platforms of the K&C test bench, respectively. The initial values ​​include toe value and camber value.

[0097] The calibration target is removed from the K&C test bench, and the four wheels of the vehicle are placed on the upper surfaces of the four corner platforms of the K&C test bench respectively. After the connecting plate of each wheel center displacement sensor is connected to the wheel hub of the corresponding tire, the K&C test is performed to obtain the absolute value and change value of the toe angle, and the absolute value and change value of the camber angle of the corresponding tire through the wheel center displacement sensor.

[0098] like Figure 5 As shown, each initial value setting includes:

[0099] Step S1, installing the bottom plate 17 of the calibration target on the upper surface of the angle platform through the plurality of first installation holes.

[0100] Step S2, by inserting multiple pins of the insertion rod 16 into multiple first plug holes of the bottom panel 17, the angle of the circular plate 20 is adjusted, and each time the angle of the circular plate 20 is adjusted, the connecting plate of the wheel center displacement sensor of the K&C test bench is installed on the circular plate 20 to set the toe value of the wheel center displacement sensor according to the angle of the circular plate 20.

[0101] Step S3, the angle of the circular plate 20 is adjusted by inserting multiple pins of the insertion rod 16 into multiple second plug-in holes of the vertical panel 18, and each time the angle of the circular plate 20 is adjusted, the connecting plate of the wheel center displacement sensor of the K&C test bench is installed on the circular plate 20 to set the camber value of the wheel center displacement sensor according to the angle of the circular plate 20.

[0102] Furthermore, when the initial value of the toe value of each wheel center displacement sensor is set, the angle between the circular plate 20 and the vertical plane is taken as the toe value of the wheel center displacement sensor.

[0103] When the initial value of the toe value of each wheel center displacement sensor is set, the angle between the circular plate 20 and the vertical plane is taken as the camber value of the wheel center displacement sensor.

[0104] Furthermore, when the initial value of the toe value of each wheel center displacement sensor is set, the angle of the circular plate 20 is adjusted at least twice to set two different toe values ​​of the wheel center displacement sensor according to two different angles of the circular plate 20 .

[0105] When the initial value of the camber value of each wheel center displacement sensor is set, the angle of the circular plate 20 is adjusted at least twice to set two different camber values ​​of the wheel center displacement sensor according to two different angles of the circular plate 20 .

[0106] In this embodiment, a calibration target holder 15 is first manufactured. Specifically, a rectangular iron plate ABCD is manufactured. A rectangular iron plate CDEF is connected to the side CD of the rectangular iron plate. The rectangular iron plate ABCD is perpendicular to the rectangular iron plate CDEF. The rectangular iron plate ABCD is used as the bottom panel 17 in the target holder 15 of the calibration target, and the rectangular iron plate CDEF is used as the vertical panel 18 in the target holder 15 of the calibration target.

[0107] For the convenience of explanation, side AD is the positive value of the X-axis, side BA is the positive value of the Y-axis, and the vertical horizontal plane ABCD is the positive value of the upward Z-axis.

[0108] Then make the calibration rod 16 of the calibration target, make a 50 cm high vertical pole 19, and have three pins distributed in a regular triangle at the lower end of the vertical pole 19. The three pins form a regular triangle HIJ, where the first rod 21 is coaxial with the vertical pole 19, the side length of the regular triangle HIJ is 5 cm, the diameter of the pin is 6 cm, and the length of the vertical part of the pin is not less than 1 cm. The upper end of the vertical pole 19 is a circular plate 20P with a diameter of 20 cm. The hole and size on the circular plate 20 are adapted to the connecting disk, so that the connecting disk of the wheel center displacement sensor can be installed on the circular plate 20P.

[0109] The seventh hole 7 is determined at the center of side BC and 10 cm away from side BC. Taking the seventh hole 7 as the center point, the first hole 1, the second hole 2, the third hole 3, the fourth hole 4, the fifth hole 5 and the sixth hole 6 are determined on a circle with a radius of 5 cm.

[0110] Taking the initial value setting of the toe angle of the wheel center displacement sensor at the left front wheel of the vehicle as an example, the bottom panel 17 is placed on the upper surface of the angle platform, a connecting disk is installed on the side of the circular plate 20 away from the second rod 22 and the third rod 23, and the wheel center displacement sensor is installed through the connecting disk.

[0111] When the first rod 21 of the vertical rod 19 is inserted into the seventh hole 7, the third rod 23 is inserted into the fifth hole 5, and the second rod 22 is inserted into the second hole 2, the plane of the circular plate 20 is parallel to the ZX plane. At this time, after the connecting plate of the wheel center displacement sensor is installed on the circular plate 20, its toe value should be 0. Then, in the system, the toe value of the wheel center displacement sensor at this time is changed to 0.

[0112] When the first rod 21 of the vertical rod 19 is inserted into the seventh hole 7, the third rod 23 is inserted into the third hole 3, and the second rod 22 is inserted into the first hole 1, the angle between the plane of the circular plate 20 and the ZX plane is 45°. At this time, after the connecting plate of the wheel center displacement sensor is installed on the circular plate 20, its toe-in value should be 45°. In the system, the toe-in value of the wheel center displacement sensor at this time is changed to 45°.

[0113] When the first rod 21 of the vertical rod 19 is inserted into the seventh hole 7, the third rod 23 is inserted into the sixth hole 6, and the second rod 22 is inserted into the fourth hole 4, the angle between the plane of the circular plate 20 and the ZX plane is 135°. At this time, after the connecting plate of the wheel center displacement sensor is installed on the circular plate 20, its toe-in value should be -45° (according to the toe-in definition). In the system, the toe-in value of the wheel center displacement sensor at this time is changed to -45°.

[0114] At this point, the toe calibration of the wheel center displacement sensor at the left front wheel of the vehicle is completed. The toe calibration of other wheel center displacement sensors is similar to the calibration of the wheel center displacement sensor at the left front wheel.

[0115] Next, the outward tilt is calibrated. The outward tilt target hole is on the CDEF plane perpendicular to ABCD, which is the second plug hole mentioned above.

[0116] Similar to the calibration of the toe angle, on the facade panel 18, the fourteenth hole 14 is the base hole, and the eighth hole 8, the ninth hole 9, the tenth hole 10, the eleventh hole 11, the twelfth hole 12 and the thirteenth hole 13 are distributed on a circle with a radius of 5 cm and the fourteenth hole 14 as the center.

[0117] When the first rod 21 of the vertical rod 19 is inserted into the fourteenth hole 14, the third rod 23 is inserted into the twelfth hole 12, and the second rod 22 is inserted into the ninth hole 9, the plane of the circular plate 20 is parallel to the ZX plane. At this time, after the connecting plate of the wheel center displacement sensor is installed on the circular plate 20, its camber value should be 0. Then in the system, the camber value of the wheel center displacement sensor at this time is changed to 0.

[0118] When the first rod 21 of the vertical rod 19 is inserted into the fourteenth hole 14, the third rod 23 is inserted into the tenth hole 10, and the second rod 22 is inserted into the eighth hole 8, the angle between the plane of the circular plate 20 and the ZX plane is 45°. At this time, after the connecting plate of the wheel center displacement sensor is installed on the circular plate 20, its camber value should be 45°. In the system, the camber value of the wheel center displacement sensor at this time is changed to 45°.

[0119] When the first rod 21 of the vertical rod 19 is inserted into the fourteenth hole 14, the third rod 23 is inserted into the thirteenth hole 13, and the second rod 22 is inserted into the eleventh hole 11, the angle between the plane of the circular plate 20 and the ZX plane is 135°. At this time, after the connecting plate of the wheel center displacement sensor is installed on the circular plate 20, its camber value should be -45° (according to the definition of camber). In the system, the camber value of the wheel center displacement sensor at this time is changed to -45°.

[0120] At this point, the camber calibration of the wheel center displacement sensor at the left front wheel of the vehicle is completed. The camber calibration of other wheel center displacement sensors is similar to the calibration of the wheel center displacement sensor at the left front wheel.

[0121] In summary, because the absolute initial values ​​of the wheel center displacement sensor and the camber have been found and assigned, the coordinate system of the four-wheel alignment measurement data and the K&C test data has been unified. The data unification of the entire process from simulation, design, and testing (different tests) is achieved, which is convenient for upstream and downstream reading and comparison. Because during a certain test, such as the K&C test, the K&C test can be verified (calibrated) by other test equipment, it is convenient to obtain intuitive data in time during testing (such as K&C test data, the absolute value can be read in time, and the size range of these values ​​is within a range). Abnormal data can also be discovered in time, and the cause can be analyzed and found.

[0122] The present application is not limited to the above-mentioned implementation modes. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A calibration target, characterized in that: Including target base and plunger; The target base comprises a bottom panel and a vertical panel which are perpendicular to each other, the edge where the bottom panel and the vertical panel meet is a junction edge, the bottom panel is provided with a plurality of first mounting holes and a plurality of first plugging holes, and the vertical panel is provided with a plurality of second plugging holes; The insertion rod includes a vertical rod, a circular plate is provided on the top of the vertical rod, the circular plate is installed with the wheel center displacement sensor of the K&C test bench, and a plurality of pins are provided at the bottom of the vertical rod, and the sizes of the pins match the first plug hole and the second plug hole respectively.

2. The calibration target according to claim 1, wherein: The top surfaces of the corner platforms of the K&C test bench are all square; The bottom panel and the vertical panel are both rectangular panels, the length of the intersection edge is twice the length of the side on the upper surface of the corner platform, and the length of all side edges of the bottom panel and the vertical panel perpendicular to the intersection edge is equal to the length of the side on the upper surface of the corner platform.

3. The calibration target according to claim 1, characterized in that: The bottom panel has a plurality of first mounting holes on one side and a plurality of first plugging holes on the other side. The side of the bottom panel that is perpendicular to the intersection and adjacent to the plurality of first mounting holes is a first outer side, and the side of the bottom panel that is perpendicular to the intersection and adjacent to the plurality of first plugging holes is a first inner side. The side of the vertical panel that is perpendicular to the intersection edge and connected to the first outer side is the second outer side, and the side of the vertical panel that is perpendicular to the intersection edge and connected to the first inner side is the second inner side. The plurality of second plug holes are provided on one side of the vertical panel close to the first inner side.

4. The calibration target according to claim 3, characterized in that: The plurality of first plugging holes include a first hole, a second hole, a third hole, a fourth hole, a fifth hole, a sixth hole and a seventh hole, and the first hole, the second hole, the third hole, the fourth hole, the fifth hole and the sixth hole are all located on a circle with the seventh hole as the center and a radius of 5 cm; The seventh hole is located at the center of a line segment parallel to the first outer side and 10 cm away; The angle between the line connecting the first hole and the seventh hole and the first outer side is 15°; The angle between the line connecting the second hole and the seventh hole and the first outer side is 60°; The angle between the line connecting the third hole and the seventh hole and the first outer side is 75°; The angle between the line connecting the fourth hole and the seventh hole and the first outer side is 105°; The angle between the line connecting the fifth hole and the seventh hole and the first outer side is 120°; The angle between the line connecting the sixth hole and the seventh hole and the first outer side is 165°.

5. The calibration target according to claim 3, characterized in that: The plurality of second plug holes include an eighth hole, a ninth hole, a tenth hole, an eleventh hole, a twelfth hole, a thirteenth hole and a fourteenth hole, and the eighth hole, the ninth hole, the tenth hole, the eleventh hole, the twelfth hole and the thirteenth hole are all located on a circle with the fourteenth hole as the center and a radius of 5 cm; The fourteenth hole is at the center of a line segment parallel to the second outer side and 10 cm away; The angle between the line connecting the eighth hole and the fourteenth hole and the first outer side is 15°; The angle between the line connecting the ninth hole and the fourteenth hole and the first outer side is 60°; The angle between the line connecting the tenth hole and the fourteenth hole and the first outer side is 75°; The angle between the line connecting the eleventh hole and the fourteenth hole and the first outer side is 105°; The angle between the line connecting the twelfth hole and the fourteenth hole and the first outer side is 120°; The angle between the line connecting the thirteenth hole and the fourteenth hole and the first outer side is 165°.

6. The calibration target according to claim 3, characterized in that: The plurality of pin rods include a first rod, a second rod and a third rod, the first rod is coaxial with the vertical rod, and the first rod, the second rod and the third rod are distributed in an equilateral triangle; The line connecting the second rod and the third rod is parallel to the circular plate.

7. The calibration target according to claim 6, characterized in that: The length of the vertical rod is 50 cm, the length of the pin rod is 1 cm, the distance between two adjacent pin rods is 5 cm, and the radius of the circular plate is 10 cm.

8. A K&C test method based on a calibration target, characterized in that: The calibration target according to any one of claims 1 to 7, comprising: Using the calibration target, the initial values ​​of the wheel center displacement sensors on the outer sides of the four corner platforms of the K&C test bench are set respectively, and the initial values ​​include the toe value and the camber value; The calibration target is removed from the K&C test bench, and the four wheels of the vehicle are placed on the upper surfaces of the four corner platforms of the K&C test bench respectively. After the connecting plate of each wheel center displacement sensor is connected to the wheel hub of the corresponding tire, the K&C test is performed to obtain the absolute value and change value of the toe angle of the corresponding tire and the absolute value and change value of the camber angle through the wheel center displacement sensor; Each initial value setting includes: Mounting the bottom plate of the calibration target on the upper surface of the angle platform through the plurality of first mounting holes; The angle of the circular plate is adjusted by inserting a plurality of pins of the insertion rod into a plurality of first insertion holes of the bottom plate, and each time the angle of the circular plate is adjusted, the connecting plate of the wheel center displacement sensor of the K&C test bench is installed on the circular plate to set the toe value of the wheel center displacement sensor according to the angle of the circular plate; The angle of the circular plate is adjusted by inserting multiple pins of the insertion rod into multiple second insertion holes of the vertical panel. Each time the angle of the circular plate is adjusted, the connecting plate of the wheel center displacement sensor of the K&C test bench is installed on the circular plate to set the camber value of the wheel center displacement sensor according to the angle of the circular plate.

9. The K&C test method based on a calibration target as claimed in claim 8, characterized in that: When the initial value of the toe value of each wheel center displacement sensor is set, the angle between the circular plate and the vertical plane is taken as the toe value of the wheel center displacement sensor; When the initial value of the toe value of each wheel center displacement sensor is set, the angle between the circular plate and the vertical plane is taken as the camber value of the wheel center displacement sensor.

10. The K&C test method based on a calibration target according to claim 8, characterized in that: When setting the initial value of the toe value of each wheel center displacement sensor, the angle of the circular plate is adjusted at least twice to set two different toe values ​​of the wheel center displacement sensor according to two different angles of the circular plate; When the initial value of the camber value of each wheel center displacement sensor is set, the angle of the circular plate is adjusted at least twice to set two different camber values ​​of the wheel center displacement sensor according to two different angles of the circular plate.

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