Chassis steering system test bench and method thereof for verifying vehicle steering angle

Abstract

The invention discloses a chassis steering system test bench and a method for verifying a vehicle steering angle thereof. The test bench comprises a lifting mechanism, a clamping mechanism, a first driving mechanism and a controller. The lifting mechanism is used for driving the clamping mechanism to lift; the clamping mechanism is used for clamping a wheel to be tested; the first driving mechanism comprises at least one first driving device, the first driving device is arranged on the lifting table, and the output end of the first driving device is connected to the clamping mechanism and can move in the horizontal direction to drive the rotating table to rotate around the axis of the rotating shaft; the first driving device is electrically connected with the controller, and the controller is used for controlling movement of the output end of the first driving device. The test bench provided by the invention has the advantages that the test bench can be used for checking the state of related parts of each load working condition and judging the state faults of a chassis steering system and each connecting part in the whole vehicle test process, problems can be quickly, safely and intuitively found, and the problem conditions can be clearly and accurately verified.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile steering systems, in particular to a chassis steering system test bench and a method for verifying a vehicle steering angle thereof. Background Art

[0002] Before, during, and after the test vehicle is put into operation, the status of the steering system and components needs to be inspected and verified:

[0003] 1. Verify the matching accuracy of the steering system hardware and software before vehicle testing;

[0004] 2. During the test, check whether the steering system and components have any functional problems such as abnormal sound, interference, oil leakage, noise, etc.

[0005] 3. After the test, verify whether the steering system and components meet the test strength requirements and verify the reliability.

[0006] When conducting chassis inspection and verification, the vehicle must be lifted. Since the vehicle's suspension components are suspended in the air, the stress state of the suspension system on the ground cannot be reflected. Therefore, it is impossible to accurately determine the specific location of the problem or fault, which leads to the following problems:

[0007] 1. It is impossible to check the status of parts under real loads, and known problems cannot be reproduced, such as interference between shock absorbers, front stabilizer bars, and control arms;

[0008] 2. During routine inspections, such as checking the steering system and ball joints, the vehicle needs to be lifted and one person needs to enter the vehicle to operate the steering wheel left and right, while two people need to push the tires left and right from below. This requires multiple people to operate, which is inconvenient and time-consuming. Summary of the Invention

[0009] To address at least one of the aforementioned technical issues, the present invention provides a chassis steering system test bench and a method for verifying a vehicle steering angle. The test bench clamps a wheel to be tested using a clamping mechanism, and a first drive device drives the clamping mechanism as a whole to rotate about the axis of a rotating shaft, thereby driving the wheel to be tested to rotate and achieve steering of the wheel to be tested.

[0010] The present invention solves the technical problem by adopting the following technical solutions:

[0011] , The camshaft is connected to the lifting platform by a first clamping plate, a second clamping plate and a locking device; the rotating platform is rotatably connected to the lifting platform by a rotating shaft; a slide rail is provided on the rotating platform, the first clamping plate is fixedly provided at one end of the slide rail, and the second clamping plate is slidably connected to the slide rail by a slider; the first clamping plate and the second clamping plate are used to abut against both sides of the wheel to be tested, and the locking device is used to lock the second clamping plate after the first clamping plate and the second clamping plate clamp the wheel to be tested; the first driving mechanism includes at least one first driving device, the first driving device is provided on the lifting platform, the output end of which is connected to the clamping mechanism, and the output end of the first driving device can move in the horizontal direction to drive the rotating platform to rotate around the axis of the rotating shaft; the first driving device is electrically connected to the controller, and the controller is used to control the movement of the output end of the first driving device.

[0012] Furthermore, the first driving mechanism includes a first driving device, an output end of which is connected to one end of the first clamping plate or the second clamping plate in the horizontal direction.

[0013] Furthermore, the first driving mechanism includes two first driving devices respectively located on both sides of the rotating shaft; the two first driving devices are both arranged on the outside of the first splint or both arranged on the outside of the second splint, and their output ends are respectively connected to the two ends of the adjacent first splint or the second splint in the horizontal direction; or, the two first driving devices are respectively arranged on the outside of the first splint and the second splint, and their output ends are connected to the end of the adjacent first splint or the second splint that is far away in the horizontal direction. The rotating table is driven to rotate by the two first driving devices, and the driving force of a single first driving device is smaller.

[0014] Furthermore, the distances from the axis of the rotating shaft to the motion trajectory straight lines of the output ends of the two first driving devices on the first vertical plane are equal, so that the two first driving devices are symmetrically arranged and the motion coordination is more precise.

[0015] Furthermore, the first clamping plate is detachably connected to the rotating platform, and the second clamping plate is detachably connected to the slider, so that the clamping plates adapted to different types of wheels can be easily replaced.

[0016] Furthermore, the output end of the first driving device is connected to a pressing plate via a fisheye joint, and the pressing plate is connected to the first clamping plate or the second clamping plate to maintain the pressing plate in contact with the first clamping plate or the second clamping plate.

[0017] Furthermore, the locking device includes a locking rod-locking nut assembly, first locking holes are provided at both horizontal ends of the first clamping plate, and second locking holes are provided at both horizontal ends of the second clamping plate. The two first locking holes are aligned with the two second locking holes respectively, and when the first clamping plate and the second clamping plate clamp the wheel to be tested, the distance between the two first locking holes is greater than the chord length of the tire at the height of the two first locking holes, and the second clamping plate can be locked by the locking rod-locking nut assembly.

[0018] Furthermore, a support platform is provided on the rotating platform, and the support platform includes two connecting plates and a support plate arranged between the two connecting plates. The connecting plates are connected to the rotating platform, and the support plate is arranged above the slide rail close to the first clamping plate to support the tire and protect the slide rail.

[0019] Furthermore, the test bench includes a control panel, the control panel includes a rotary switch, and the rotary switch is electrically connected to the controller and is used to send a rotation instruction to the controller to control the movement of the output end of the first drive device.

[0020] Furthermore, the rotation switch includes a clockwise rotation switch, a counterclockwise rotation switch, a 0° reset switch and a plurality of preset angle switches, wherein the 0° reset switch is used to send a rotation instruction to the controller to control the movement of the output end of the first drive device so that the rotating table rotates until the extension direction of the slide rail is consistent with the movement direction of the output end of the first drive device.

[0021] Furthermore, the controller includes:

[0022] An instruction receiving module includes a rotation direction receiving module and a rotation angle receiving module, which are respectively used to receive a rotation direction instruction and a rotation angle instruction, and send a rotation direction signal and a rotation angle signal to the instruction calculation module;

[0023] The instruction calculation module is used to calculate the rotation value according to the received rotation direction signal and rotation angle signal, and send it to the instruction output module;

[0024] The instruction output module is used to send action instructions to each first control device according to the received rotation value.

[0025] Furthermore, the rotation value is set as a duty cycle; when the rotation direction signal is a first direction, the duty cycle value is equal to the percentage of the angle value corresponding to the rotation angle signal; when the rotation direction signal is in the opposite direction of the first direction, the duty cycle value is equal to 1 minus the difference between the percentage of the angle value corresponding to the rotation angle signal.

[0026] Furthermore, a method for verifying a vehicle steering angle, applied to the test bench described above, comprises the following steps:

[0027] Step 1: Lift the vehicle to be tested with a lift so that the wheel to be tested is freely suspended, and then clamp the wheel to be tested between the first clamping plate and the second clamping plate;

[0028] Step 2: Control the output end of the first driving device to move so that the rotating platform rotates until the extension direction of the slide rail is consistent with the movement direction of the output end of the first driving device, and keep the wheel to be tested in the correct position;

[0029] Step 3: Check whether the signal sent by the vehicle angle sensor is consistent with 0°; if the signal sent by the vehicle angle sensor is consistent with 0°, execute step 4; if the signal sent by the vehicle angle sensor is inconsistent with 0°, stop the test;

[0030] Step 4: Control the output end of the first driving device to move so that the rotating platform rotates to a predetermined angle;

[0031] Step 5: Detect whether the signals sent by the vehicle's rotation angle sensor are consistent with the corresponding predetermined angles.

[0032] Furthermore, the method further includes calibrating the correspondence between the extension length of the output end of the first driving device and the rotation angle of the rotating platform, and the calibration method includes:

[0033] Lift the standard vehicle with a lift so that the calibration wheel is freely suspended, and clamp the calibration wheel between the first clamping plate and the second clamping plate;

[0034] Rotate the rotating platform until the extension direction of the slide rail is consistent with the movement direction of the output end of the first drive device, and keep the calibrated wheel in the correct position. Calibrate the extension length of each output end of the first drive device connected to the first clamping plate or the second clamping plate to 0°;

[0035] The calibration wheel is controlled by the steering wheel to rotate to the angle to be calibrated, and the extended length of the output end of each first driving device connected to the first clamping plate or the second clamping plate is calibrated to a predetermined angle consistent with the calibration angle.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] (1) The test bench can simulate the status of parts, chassis steering system and various connecting components under real loads. It can be used to check the status of relevant parts under various load conditions during the vehicle test, and to judge the status faults of the chassis steering system and various connecting components. It can quickly, safely and intuitively discover problems and clearly and accurately verify the problem situation.

[0038] (2) A single person can operate the system simply and verify specific problem points efficiently and effectively. At the same time, it can save working hours and improve operating efficiency while ensuring safety.

[0039] (3) The vehicle steering angle can be verified by this test bench. Compared with the ordinary four-wheel alignment system that can only test the deviation of the car in a straight line (0°), the deviation of the wheel at various predetermined steering angles can be quickly measured by this test bench, such as the deviation at wheel steering angles of 15°, 30°, 45°, etc. The operation is simple and fast, and the measurement is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] To better understand the above and other objects, features, advantages, and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. Like reference numerals in the accompanying drawings refer to like components. Those skilled in the art should understand that the accompanying drawings are intended to schematically illustrate preferred embodiments of the present invention and have no limiting effect on the scope of the present invention. The components in the drawings are not drawn to scale.

[0041] Figure 1 It is a structural schematic diagram of the chassis steering system test bench of the present invention.

[0042] Figure 2 This is a schematic diagram of the exploded structure of the chassis steering system test bench of the present invention.

[0043] Figure 3 This is a schematic diagram of the control panel structure.

[0044] Figure 4 This is the controller structure diagram.

[0045] Figure 5 An interface that sends angle signals to the vehicle steering angle sensor of the Odis system.

[0046] In the figure: 1. lifting mechanism; 11. support rod; 12. lifting platform; 121. bracket; 13. base; 14. foot control panel; 15. universal wheel; 2. clamping mechanism; 21. rotating platform; 211. slide rail; 212. bearing; 22. first clamping plate; 221. first locking hole; 23. second clamping plate; 231. slider; 232. second locking hole; 24. locking rod; 25. support platform; 3. first driving device; 31. pressure plate; 4. controller; 41. instruction receiving module; 411. rotation direction receiving module; 412. rotation angle receiving module; 42. instruction calculation module; 43. instruction output module; 5. control panel; 51. rotary switch; 6. tire. DETAILED DESCRIPTION

[0047] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, exemplary embodiments of the present invention are described below with reference to the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding. These details should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0048] In the description of the present invention, it should be noted that the term "including" and its variations represent an open-ended inclusion, i.e., "including but not limited to." The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of the present invention, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0049] The present invention provides a chassis steering system test bench, referring to Figure 1 and Figure 2 As shown, it includes a lifting mechanism 1, a clamping mechanism 2, a first driving mechanism and a controller 4; the lifting mechanism 1 includes a support rod 11 and a lifting platform 12, the support rod 11 can be lifted and lowered in the vertical direction, and the lifting platform 12 is arranged on the top of the support rod 11; the clamping mechanism 2 includes a rotating platform 21, a first clamping plate 22, a second clamping plate 23 and a locking device; the rotating platform 21 is rotatably connected to the lifting platform 12 through a rotating shaft; a slide rail 211 is provided on the rotating platform 21, the first clamping plate 22 is fixedly arranged at one end of the slide rail 211, and the second clamping plate 23 is slidably connected through a slider 231 connected to the slide rail 211; the first clamping plate 22 and the second clamping plate 23 are used to abut against both sides of the wheel to be tested, and the locking device is used to lock the second clamping plate 23 after the first clamping plate 22 and the second clamping plate 23 clamp the wheel to be tested; the first driving mechanism includes at least one first driving device 3, the first driving device 3 is arranged on the lifting platform 12, and its output end is connected to the clamping mechanism 2, and its output end can move in the horizontal direction to drive the rotating table 21 to rotate around the axis of the rotating shaft; the first driving device 3 is electrically connected to the controller 4, and the controller 4 is used to control the movement of the output end of the first driving device 3.

[0050] The lifting mechanism 1 can adopt a telescopic lifting platform, and the support rod 11 uses a telescopic rod, or a scissor-type lifting platform, and the support rod 11 uses an X-shaped scissor arm. The lifting of the support rod 11 can be driven by a second drive device, and the second drive device can adopt a drive device such as a cylinder or a hydraulic cylinder. Preferably, a foot-operated hydraulic control lifting platform can be used, and the lifting platform 12 can be lifted and lowered by stepping on the foot control panel 14 to meet the actual load and height requirements, and the lifting operation is more convenient. The structure of the lifting mechanism 1 is not limited here, as long as the lifting platform 12 can be lifted and lowered. In order to facilitate the movement of the lifting mechanism 1, a base 13 can also be provided at the bottom of the support rod 11, and a universal wheel 15 can be provided on the base 13.

[0051] The rotating platform 21 is preferably rotatably connected to the lifting platform 12 via a bearing 212. Specifically, the bearing 212 can be a flange bearing 212. A connecting hole is provided on the lifting platform 12, and the rotating shaft is provided as a pin in the middle of the rotating platform 21. The outer ring of the flange bearing 212 is interference-fitted into the connecting hole, and the rotating shaft is interference-fitted into the inner ring of the bearing 212. Alternatively, the bearing 212 can be a turntable bearing 212. The inner ring of the turntable bearing 212 is bolted to the rotating platform 21, and the outer ring of the turntable bearing 212 is also bolted to the lifting platform 12. The rotating shaft is the inner ring of the turntable bearing 212. Rotation of the inner ring of the bearing 212 drives the rotating platform 21, resulting in smooth and effortless rotation.

[0052] The first clamping plate 22 can be fixed to the rotating table 21 at the end of the slide rail 211 by welding, screwing, or clamping. A slider 231 is provided at the bottom of the second clamping plate 23. The slider 231 is slidably connected to the slide rail 211, allowing the second clamping plate 23 to slide along the slide rail 211. Preferably, the first clamping plate 22 is detachably connected to the rotating table 21, and the second clamping plate 23 is detachably connected to the slider 231. For example, protrusions can be provided on the rotating table 21 and the slider 231, and slots can be provided at the bottoms of the first and second clamping plates 22, 23, so that the protrusions can be inserted into the slots for securement. In this way, the first and second clamping plates 22, 23 can be replaced with appropriate sizes depending on the model of the tire 6. To improve the reliability of the sliding fit between the slider 231 and the slide rail 211 and maintain linear motion of the second clamping plate 23 along the extension direction of the slide rail 211, the slide rail 211 can be provided with two parallel rails, and preferably, the slider 231 is provided with two corresponding slots that match the rails.

[0053] The first clamping plate 22 and the second clamping plate 23 can preferably be set to a U shape. By clamping the sidewall of the tire 6 to be tested by the vertical plates on both sides of the U shape, the weight of the first clamping plate 22 and the second clamping plate 23 can be reduced, the driving force can be reduced, and it is also convenient to observe the clamping state of the tire 6.

[0054] The first drive device 3 can be fixedly mounted on the lifting platform 12 via a bracket 121. The bracket 121 is configured in an L-shape to support the first drive device 3 at a suitable height. The output end of the first drive device 3 can be detachably connected to the clamping mechanism 2 via a snap-on or screw-on connection, and can be connected to at least one of the first clamping plate 22, the second clamping plate 23, and the rotating platform 21.

[0055] The test bench can be used to check the status of chassis-related parts under various load conditions during vehicle testing, and to determine the status faults of the chassis steering system and various connecting components, allowing problems to be discovered quickly, safely and intuitively.

[0056] During use, the vehicle to be tested is lifted by a lift so that the wheel to be tested is freely suspended, and then the wheel to be tested is clamped between the first clamping plate 22 and the second clamping plate 23. Specifically, the support rod 11 is driven to rise, raising the lifting platform 12 to the bottom of the wheel to be tested, and the wheel to be tested is placed between the first clamping plate 22 and the second clamping plate 23, so that the first clamping plate 22 abuts the sidewall of one side of the wheel to be tested; then the second clamping plate 23 is moved along the slide rail 211 so that the second clamping plate 23 abuts the sidewall of the other side of the wheel to be tested, and the second clamping plate 23 is locked by the locking device, thereby clamping the wheel to be tested between the first clamping plate 22 and the second clamping plate 23. Then, the controller 4 controls the extension length of the output end of the first drive device 3, which can drive the rotating platform 21 to rotate, causing the clamping mechanism 2 to rotate around the axis of the rotating shaft as a whole, thereby driving the wheel to be tested to rotate and achieve steering of the wheel to be tested. In this way, it is convenient to check whether there are any problems with the vehicle steering system and suspension system. By adjusting the lifting mechanism 1 to drive the lifting platform 12 to the appropriate height to compress the wheel, the force compression state generated by the suspension components when the vehicle is on the ground can be simulated, realizing the component state under real load. By controlling the extension length of the output end of the first drive device 3, the rotation angle of the rotating platform 21 can be controlled. The rotation angle control is precise, allowing the wheel under test to rotate to any angle and also checking and verifying the vehicle's steering angle.

[0057] The first driving device 3 can be a driving device such as a cylinder, a hydraulic cylinder, etc. For the convenience of description, the following exemplary description and explanation are given using a cylinder as an example.

[0058] For ease of understanding and description, clockwise and counterclockwise directions are defined as clockwise and counterclockwise directions when viewed from above, and counterclockwise rotation is defined as positive rotation, while clockwise rotation is defined as negative rotation.

[0059] In some embodiments, the first drive mechanism includes a first drive device 3, whose output end is connected to one end of the first clamping plate 22 or the second clamping plate 23 in the horizontal direction. The first drive device 3 pushes and pulls the end of the first clamping plate 22 or the second clamping plate 23 in the horizontal direction, which can drive the clamping mechanism 2 to rotate as a whole. For example, the piston rod end of the cylinder is connected to the right end of the first clamping plate 22. When the piston rod of the cylinder is extended, it can push the clamping mechanism 2 to rotate counterclockwise. When the piston rod of the cylinder retracts, it can pull the clamping mechanism 2 to rotate clockwise. When the output end of the first drive device 3 is connected to the second clamping plate 23 and the second clamping plate 23 moves along the slide rail 211, the extended length of the output end of the first drive device 3 is adjusted accordingly. The second clamping plate 23 can also be moved into place to clamp the wheel to be tested, and then the output end of the first drive device 3 is connected to the second clamping plate 23.

[0060] In some embodiments, the first drive mechanism includes two first drive devices 3 located on either side of the rotating shaft; both first drive devices 3 are located outside the first clamping plate 22 or outside the second clamping plate 23, and their output ends are connected to the adjacent horizontal ends of the first clamping plate 22 or second clamping plate 23. For example, the piston rod ends of two cylinders are connected to the left and right ends of the first clamping plate 22, respectively. In this case, the two cylinders are located on the same side of the wheel to be tested. When the clamping mechanism 2 is driven to rotate, the piston rod of one cylinder extends, while the piston rod of the other cylinder correspondingly shortens.

[0061] In some embodiments, the first drive mechanism includes two first drive devices 3 located on both sides of the rotating shaft; the two first drive devices 3 are respectively arranged on the outside of the first plywood 22 and the second plywood 23, and their output ends are connected to the end of the first plywood 22 or the second plywood 23 that is close to each other in the horizontal direction. For example, the piston rod ends of the two cylinders are respectively connected to the right end of the first plywood 22 and the right end of the second plywood 23. At this time, the two cylinders are arranged on both sides of the wheel to be tested. When the clamping mechanism 2 is driven to rotate, the piston rods of the two cylinders are synchronously extended or shortened. Preferably, it is better if both first drive devices 3 are arranged on the outside of the first plywood 22, so that the extended length of the output end of the first drive device 3 can be easily controlled, and the size of the lifting platform in the extension and retraction direction of the piston rod can be saved, thereby saving space and cost.

[0062] It is understood that the side between the first clamping plate 22 and the second clamping plate 23 is the inner side, and the side opposite to the first clamping plate 22 and the second clamping plate 23 is the outer side. The left end and the right end are the left end and the right end when viewed toward the end face of the wheel.

[0063] Preferably, the distances from the axis of the rotating shaft to the first vertical plane where the straight lines of motion of the output ends of the two first drive devices 3 are located are equal. The piston rod of one cylinder extends and retracts along the first horizontal line (its straight line of motion), and the piston rod of the other cylinder extends and retracts along the second horizontal line (its straight line of motion). The distance from the axis of the rotating shaft to the first vertical plane where the first horizontal line is located is equal to the distance from the axis of the rotating shaft to the first vertical plane where the second horizontal line is located. Specifically, when both cylinders are arranged on the outside of the first splint 22 or both are arranged on the outside of the second splint 23, the two cylinders are arranged in mirror symmetry on the second vertical plane, and the second vertical plane is defined as the plane parallel to the first vertical plane where the axis of the rotating shaft is located. When the two first drive devices 3 are respectively arranged on the outside of the first splint 22 and the second splint 23, the two cylinders are arranged symmetrically with respect to the center of the axis of the rotating shaft. In this way, the two first drive devices 3 can be set symmetrically. When the rotating table 21 is driven to rotate, the extended length or retracted length of the output ends of the two first drive devices 3 remains consistent, so that the forces on both sides of the tire 6 are consistent and balanced. At the same time, the control of the controller 4 is simpler, the movement coordination of the output ends of the two first drive devices 3 is more precise, and the accuracy of wheel steering angle detection is improved.

[0064] In some embodiments, the output end of the first drive device 3 is connected to a pressure plate 31 via a fisheye joint, and the pressure plate 31 is connected to the first clamping plate 22 or the second clamping plate 23. During the rotation of the first clamping plate 22 and the second clamping plate 23, the piston rod of the cylinder linearly extends or contracts, and the angle between the plane of the outer surface of the first clamping plate 22 and the second clamping plate 23 and the linear trajectory of the piston rod changes. The fisheye joint allows the pressure plate 31 to swing accordingly, maintaining the contact between the pressure plate 31 and the first clamping plate 22 or the second clamping plate 23, thereby preventing damage to the output end of the first drive device 3. The pressure plate 31 can be separately configured as a flat plate with two lugs, which are connected to the first clamping plate 22 and the second clamping plate 23 by bolts; the pressure plate 31 can also be integrated with the first clamping plate 22 and the second clamping plate 23, that is, the lugs are integrated with the first clamping plate 22 and the second clamping plate 23.

[0065] In some embodiments, the locking device includes a locking rod 24-locking nut assembly. First locking holes 221 are provided at both horizontal ends of the first clamping plate 22, and second locking holes 232 are provided at both horizontal ends of the second clamping plate 23. The two first locking holes 221 are aligned with the two second locking holes 232, and when the first clamping plate and the second clamping plate clamp the wheel to be tested, the distance between the two first locking holes 221 is greater than the chord length of the tire 6 at the height where the two first locking holes 221 are located. When the second clamping plate 23 abuts the tire 6, the two first locking holes 221 and the two second locking holes 232 are both located outside the tread of the tire 6, preventing interference between the tire 6 and the locking rod 24. By passing the two locking rods 24 through the first locking holes 221 and the second locking holes 232 and tightening them with the locking nuts, the second clamping plate 23 is locked, stably clamping the wheel to be tested between the first clamping plate 22 and the second clamping plate 23. The locking rod 24 may be a long screw, a long bolt, a long smooth bolt, or the like.

[0066] Of course, the locking device can also be configured as other structures. For example, the locking device can also be configured as a fastening screw. The slider 231 is provided with a through hole, and the rotating table 21 is provided with a threaded hole. The distance between the axis of the threaded hole and the plane where the clamping surface of the first clamping plate 22 is located is adapted to the thickness of the wheel to be tested. When the second clamping plate 23 is against the tire 6, the through hole and the threaded hole are aligned, and the fastening screw passes through the through hole and is screwed into the threaded hole, locking the slider 231 to the rotating table 21, so that the first clamping plate 22 and the second clamping plate 23 clamp the tire 6. The slider 231 can be provided with multiple through hole groups, and correspondingly, the rotating table 21 is provided with multiple threaded hole groups. The slider 231 is locked to the rotating table 21 by multiple fastening screws, keeping the slider 231 locked stably and reliably. The threaded holes can be provided in multiple groups distributed along the extension direction of the slide rail 211 to accommodate different wheel thicknesses.

[0067] In some embodiments, a support platform 25 is provided on the rotating platform 21. The support platform 25 includes two connecting plates and a support plate disposed between the two connecting plates. The connecting plates are connected to the rotating platform 21, and the support plate is disposed above the slide rail 211 near the first clamping plate 22. The support platform 25 is configured as a bridge, spanning above the slide rail 211, and can support the tire 6 and protect the slide rail 211, preventing the tire 6 from being directly placed on the slide rail 211 and damaging the slide rail 211.

[0068] In some embodiments, the test bench includes a control panel 5, which includes a rotary switch 51. The rotary switch 51 is electrically connected to the controller 4 and is used to send a rotation instruction to the controller 4 to control the movement of the output end of the first drive device 3. Preferably, the rotary switch 51 includes a clockwise rotation switch, a counterclockwise rotation switch, a 0° reset switch, and a plurality of predetermined angle switches. The 0° reset switch is used to send a rotation instruction to the controller 4 to control the movement of the output end of the first drive device 3 so that the rotary table 21 rotates until the extension direction of the slide rail 211 is consistent with the movement direction of the output end of the first drive device 3.

[0069] When the extension direction of the slide rail 211 is consistent with the movement direction of the output end of the first drive device 3, the angle of the turntable 21 is set to 0°, and the other rotation angles of the turntable 21 are angles rotated relative to the position of 0°. The rotation amplitude of the wheel is roughly between -45° and 45°. According to needs, the rotation angles of the turntable 21 corresponding to each of the predetermined angle switches (i.e., the vehicle steering angle) include ±15°, ±30°, ±45°, etc., to simulate the working process of the real steering system. Each predetermined angle switch can directly set the angle switch of the corresponding rotation direction, or it can be used in conjunction with a direction control switch and an angle size switch. By operating the clockwise rotation switch and the counterclockwise rotation switch, the turntable 21 can be controlled to rotate freely clockwise or counterclockwise. Operating the 0° reset switch and the predetermined angle switch can drive the turntable 21 to rotate directly to the specified angle. For example, Figure 3 As shown, the control panel 5 can be a wireless remote control. The remote control is equipped with buttons 1#-8#, which are, in order: a clockwise inching switch, a counterclockwise inching switch, a 15° switch, a 30° switch, a 45° switch, a 0° reset switch, a forward switch, and a reverse switch. Pressing the forward switch and then the 15° switch rotates the turntable 21 to a 15° counterclockwise angle; pressing the reverse switch and then the 15° switch rotates the turntable 21 to a 15° clockwise angle. In this way, by operating the rotation switch 51, the turntable 21 can be controlled to rotate to a specified angle, providing convenient control and simple operation.

[0070] In some embodiments, reference Figure 4 As shown, the controller 4 includes:

[0071] The instruction receiving module 41 includes a rotation direction receiving module 411 and a rotation angle receiving module 412, which are respectively used to receive a rotation direction instruction and a rotation angle instruction, and send a rotation direction signal and a rotation angle signal to the instruction calculating module 42;

[0072] The instruction calculation module 42 is used to calculate the rotation value according to the received rotation direction signal and rotation angle signal, and send it to the instruction output module 43;

[0073] The instruction output module 43 is used to send action instructions to each first control device according to the received rotation value.

[0074] For example, a rotation direction instruction and a rotation angle instruction can be sent through the rotary switch 51, and the controller 4 sends an action instruction to each first control device according to the rotation direction instruction and the rotation angle instruction, thereby controlling the output end of each first drive device 3 to make a corresponding extension or retraction movement.

[0075] In some embodiments, the rotation value is set as a duty cycle; when the rotation direction signal is a first direction, the duty cycle value is equal to the percentage of the angle value corresponding to the rotation angle signal; when the rotation direction signal is the opposite direction of the first direction, the duty cycle value is equal to 1 minus the difference between the percentage of the angle value corresponding to the rotation angle signal.

[0076] It will be understood that the rotation angle signal is an angle signal relative to the 0° position. For example, if the first direction is set to the positive direction (counterclockwise), when the turntable 21 needs to rotate from a 15° angle to a 45° angle, the forward switch and the 45° switch are pressed. The rotation direction signal received by the instruction calculation module 42 is the positive direction, and the rotation angle signal is 45°. Therefore, the duty cycle = 45%. The action command received by each first control device is the signal corresponding to the 45% duty cycle. The output end of each first drive device 3 performs a corresponding extension or retraction movement based on the current extension length, so that the extension length of the output end of each first drive device 3 is consistent with the length corresponding to the 45% duty cycle, thereby driving the turntable 21 to rotate counterclockwise 30°, i.e., to the position corresponding to the 45° angle. For example, when the turntable 21 is at 15°, the extended length of a cylinder piston rod is L1. When the turntable 21 is at 45°, the extended length of the cylinder piston rod is L2 (L2>L1). Then, the extended length of the cylinder piston rod extends from L1 to L2.

[0077] At this point, if the 0° reset switch is pressed, the turntable 21 needs to rotate in the reverse direction to reset. The rotation direction signal received by the instruction calculation module 42 is the reverse direction, and the rotation angle signal is 45°. Therefore, the duty cycle = 1-45% = 55%. The action command received by each first control device is the signal corresponding to a duty cycle of 55%. The output end of each first drive device 3 performs a corresponding extension or retraction movement, so that the extended length of the output end of each first drive device 3 matches the length corresponding to a duty cycle of 0, and the turntable 21 is reset.

[0078] If the vehicle produces a virtual steering angle, an incorrect steering angle range, or wheel deviation or abnormal steering noise during the test, the vehicle steering angle needs to be verified.

[0079] The present invention also provides a method for verifying a vehicle steering angle, which is applied to the test bench described above and comprises the following steps:

[0080] Step 1: Lift the vehicle to be tested by a lift so that the wheel to be tested is freely suspended, and then clamp the wheel to be tested between the first clamping plate 22 and the second clamping plate 23;

[0081] Step 2: Control the output end of the first driving device 3 to rotate the rotating platform 21 until the extension direction of the slide rail 211 is consistent with the movement direction of the output end of the first driving device 3, and keep the wheel to be tested in the correct position;

[0082] Step 3: Check whether the signal sent by the vehicle angle sensor is consistent with 0°; if the signal sent by the vehicle angle sensor is consistent with 0°, execute step 4; if the signal sent by the vehicle angle sensor is inconsistent with 0°, stop the test;

[0083] Step 4: Control the output end of the first driving device 3 to move so that the rotating platform 21 rotates to a predetermined angle;

[0084] Step 5: Detect whether the signals sent by the vehicle's rotation angle sensor are consistent with the corresponding predetermined angles.

[0085] In step 2, the 0° reset switch can be pressed to reset the first drive unit 3, causing the rotating platform 21 to rotate until the extension direction of the slide rail 211 aligns with the direction of motion of the output end of the first drive unit 3. Maintaining the correct position of the wheel under test can be achieved by manipulating the steering wheel, even when the wheel is traveling straight. By comparing the signal sent by the vehicle's steering angle sensor with 0°, the 0° (base position) position of the vehicle's steering angle sensor G85 can be confirmed.

[0086] If the 0° position is accurate, proceed to step 4 to confirm the positions of other predetermined angles. In step 4, the predetermined angle switch can be pressed to rotate the rotating platform 21 directly to the predetermined angle. Comparing the signal sent by the vehicle angle sensor with each corresponding predetermined angle can verify the accuracy and functionality of the vehicle angle sensor G85 calibration.

[0087] If the signals sent by the vehicle's steering angle sensor are consistent with the predetermined angles (including 0°) at each predetermined angle of rotation of the rotating platform 21, the vehicle's steering angle is accurate. If any of the signals are inconsistent, the test is terminated. If the signals sent by the vehicle's steering angle sensor are inconsistent with the predetermined angles, it indicates that the G85 sensor is not calibrated or is faulty, and the vehicle needs to be re-diagnosed and adjusted. This may include performing post-diagnosis, hardware replacement, software update, software recalibration, or four-wheel alignment adjustment before re-testing and verification.

[0088] The signals sent by the vehicle's steering angle sensor can be read by devices such as the Odis diagnostic system (Volkswagen Audi professional diagnostic software system for diagnosis, encoding, reading data streams, etc.) and the DiagRA D diagnostic system (professional diagnostic software system for reading diagnostic data from the vehicle control unit).

[0089] It is understood that the signal sent by the vehicle angle sensor is consistent with the predetermined angle, including the signal sent by the vehicle angle sensor is within the set signal deviation range. The deviation of the wheel steering angle is generally set to no more than 2°, and the vehicle angle sensor signal deviation is set accordingly. Figure 5 As shown, according to the Odis system settings, the signal sent by the vehicle angle sensor is 10 times the wheel steering angle. For example, if the predetermined angle is 30°, the corresponding vehicle angle sensor sends a signal of 300°. The deviation range of the wheel steering angle is ±1°, and the corresponding deviation of the signal sent by the vehicle angle sensor is ±10°. When the signal sent by the vehicle angle sensor is 290°-310°, it is considered consistent with the predetermined angle. If the signal sent by the vehicle angle sensor is inconsistent with the predetermined angle, the deviation between the signal sent by the vehicle angle sensor and the predetermined angle can also be calculated to provide guidance for subsequent adjustment and calibration work.

[0090] Ordinary four-wheel alignment systems can only test the deviation of the car when driving in a straight line (0°), and cannot measure the angular deviation of the wheel when turning. Compared with ordinary four-wheel alignment systems, this method can quickly measure the deviation of the wheel at various predetermined steering angles, such as deviation at wheel steering angles of 15°, 30°, 45°, etc. The operation is simple and fast, and the measurement is accurate.

[0091] In some embodiments, the method further includes calibrating the correspondence between the extension length of the output end of the first driving device 3 and the rotation angle of the rotating platform 21, and the calibration method includes:

[0092] Lift the standard vehicle with a lift so that the calibration wheel is suspended freely, and clamp the calibration wheel between the first clamping plate 22 and the second clamping plate 23;

[0093] Rotate the rotating platform 21 until the extension direction of the slide rail 211 is consistent with the movement direction of the output end of the first drive device 3, and keep the calibrated wheel in the correct position. At this time, calibrate the extension length of each output end of the first drive device 3 connected to the first clamping plate 22 or the second clamping plate 23 to 0°;

[0094] The calibration wheel is rotated to the angle to be calibrated by controlling the steering wheel, and the extended length of the output end of each first driving device 3 connected to the first clamping plate 22 or the second clamping plate 23 is calibrated to a predetermined angle consistent with the calibration angle.

[0095] Standard vehicles can use new standard tires. 6. The steering angle sensor G85 must not have any related alarms or faults and must meet the requirements of the four-wheel alignment. The angle signal emitted by the steering angle sensor G85 of a standard vehicle is consistent with the vehicle's steering angle, that is, the steering angle sensor G85 of a standard vehicle can generate an accurate angle signal.

[0096] By manipulating the steering wheel, the calibrated wheel drives the rotating platform 21 to rotate until the vehicle angle sensor sends a specified angle signal. At this time, the rotating platform 21 rotates to the angle to be calibrated. The operator then manually controls the piston rod of the driving cylinder to extend or shorten, and connects the output end of the cylinder to the first clamping plate 22 or the second clamping plate 23. In this way, the operation of controlling the extension or shortening of the piston rod of the cylinder is more flexible. Figure 5 As shown, for example, the angle signal emitted by the vehicle angle sensor measured by the Odis system is 300°, and the extended length of the two cylinder piston rods at this time is calibrated to 30°; the angle signal emitted by the vehicle angle sensor measured by the Odis system is -300°, and the extended length of the two cylinder piston rods at this time is calibrated to -30°.

[0097] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A chassis steering system test bench, characterized in that: It includes a lifting mechanism, a clamping mechanism, a first driving mechanism and a controller; The lifting mechanism includes a support rod and a lifting platform, the support rod can be lifted and lowered in a vertical direction, and the lifting platform is arranged on the top of the support rod; The clamping mechanism includes a rotating platform, a first clamping plate, a second clamping plate, and a locking device; the rotating platform is rotatably connected to the lifting platform via a rotating shaft; a slide rail is provided on the rotating platform, the first clamping plate is fixedly provided at one end of the slide rail, and the second clamping plate is slidably connected to the slide rail via a slider; the first clamping plate and the second clamping plate are used to abut against both sides of the wheel to be tested, and the locking device is used to lock the second clamping plate after the first clamping plate and the second clamping plate clamp the wheel to be tested; The first driving mechanism includes at least one first driving device, which is arranged on the lifting platform, and its output end is connected to the clamping mechanism, and its output end can move in the horizontal direction to drive the rotating table to rotate around the axis of the rotating shaft; the first driving device is electrically connected to the controller, and the controller is used to control the movement of the output end of the first driving device.

2. The chassis steering system test bench according to claim 1, characterized in that: The first driving mechanism includes a first driving device, an output end of which is connected to one end of the first clamping plate or the second clamping plate in the horizontal direction.

3. The chassis steering system test bench according to claim 1, characterized in that: The first driving mechanism includes two first driving devices respectively located on both sides of the rotating shaft; the two first driving devices are both arranged on the outside of the first splint or both arranged on the outside of the second splint, and their output ends are respectively connected to the two ends of the adjacent first splint or the second splint in the horizontal direction; or, the two first driving devices are respectively arranged on the outside of the first splint and the second splint, and their output ends are connected to the end of the adjacent first splint or the second splint that is far away in the horizontal direction.

4. The chassis steering system test bench according to claim 3, characterized in that: The distances from the axis of the rotating shaft to the motion trajectory straight lines of the output ends of the two first driving devices on the first vertical plane are equal.

5. The chassis steering system test bench according to claim 1, characterized in that: The first clamping plate is detachably connected to the rotating platform, and the second clamping plate is detachably connected to the sliding block.

6. The chassis steering system test bench according to claim 1, characterized in that: The output end of the first driving device is connected to a pressing plate via a fisheye connector, and the pressing plate is connected to the first clamping plate or the second clamping plate.

7. The chassis steering system test bench according to claim 1, characterized in that: The locking device includes a locking rod-locking nut assembly, first locking holes are provided at both horizontal ends of the first clamping plate, and second locking holes are provided at both horizontal ends of the second clamping plate. The two first locking holes are aligned with the two second locking holes respectively, and when the first clamping plate and the second clamping plate clamp the wheel to be tested, the distance between the two first locking holes is greater than the chord length of the tire at the height where the two first locking holes are located.

8. The chassis steering system test bench according to claim 1, characterized in that: The rotating platform is provided with a support platform, which includes two connecting plates and a support plate provided between the two connecting plates. The connecting plates are connected to the rotating platform, and the support plate is provided above the slide rail close to the first clamping plate.

9. The chassis steering system test bench according to claim 1, characterized in that: The test bench includes a control panel, which includes a rotary switch. The rotary switch is electrically connected to the controller and is used to send a rotation instruction to the controller to control the movement of the output end of the first drive device.

10. The chassis steering system test bench according to claim 9, characterized in that: The rotation switch includes a clockwise rotation switch, a counterclockwise rotation switch, a 0° reset switch and multiple preset angle switches. The 0° reset switch is used to send a rotation instruction to the controller to control the movement of the output end of the first drive device so that the rotating table rotates until the extension direction of the slide rail is consistent with the movement direction of the output end of the first drive device.

11. The chassis steering system test bench according to claim 1, 9 or 10, characterized in that: The controller includes: An instruction receiving module includes a rotation direction receiving module and a rotation angle receiving module, which are respectively used to receive a rotation direction instruction and a rotation angle instruction, and send a rotation direction signal and a rotation angle signal to the instruction calculation module; The instruction calculation module is used to calculate the rotation value according to the received rotation direction signal and rotation angle signal, and send it to the instruction output module; The instruction output module is used to send action instructions to each first control device according to the received rotation value.

12. The chassis steering system test bench according to claim 11, characterized in that: The rotation value is set as a duty cycle; when the rotation direction signal is a first direction, the duty cycle value is equal to the percentage of the angle value corresponding to the rotation angle signal; when the rotation direction signal is the opposite direction of the first direction, the duty cycle value is equal to 1 minus the difference between the percentage of the angle value corresponding to the rotation angle signal.

13. A method for verifying a vehicle steering angle, applied to the test bench according to any one of claims 1 to 12, characterized in that: The following steps are involved: Step 1: Lift the vehicle to be tested with a lift so that the wheel to be tested is freely suspended, and then clamp the wheel to be tested between the first clamping plate and the second clamping plate; Step 2: Control the output end of the first driving device to move so that the rotating platform rotates until the extension direction of the slide rail is consistent with the movement direction of the output end of the first driving device, and keep the wheel to be tested in the correct position; Step 3: Check whether the signal sent by the vehicle angle sensor is consistent with 0°; if the signal sent by the vehicle angle sensor is consistent with 0°, execute step 4; if the signal sent by the vehicle angle sensor is inconsistent with 0°, stop the test; Step 4: Control the output end of the first driving device to move so that the rotating platform rotates to a predetermined angle; Step 5: Detect whether the signals sent by the vehicle's rotation angle sensor are consistent with the corresponding predetermined angles.

14. The method for verifying a vehicle steering angle according to claim 13, wherein: The method further includes calibrating the correspondence between the extension length of the output end of the first driving device and the rotation angle of the rotating platform, and the calibration method includes: Lift the standard vehicle with a lift so that the calibration wheel is freely suspended, and clamp the calibration wheel between the first clamping plate and the second clamping plate; Rotate the rotating platform until the extension direction of the slide rail is consistent with the movement direction of the output end of the first drive device, and keep the calibrated wheel in the correct position. Calibrate the extension length of each output end of the first drive device connected to the first clamping plate or the second clamping plate to 0°; The calibration wheel is controlled by the steering wheel to rotate to the angle to be calibrated, and the extended length of the output end of each first driving device connected to the first clamping plate or the second clamping plate is calibrated to a predetermined angle consistent with the calibration angle.

Images