Automobile Steering Performance Testing Device and Method

Abstract

The present invention belongs to the technical field of steering performance testing, and particularly relates to an automobile steering performance testing device and method, which includes a box body, a testing device placed in the box body for connecting with the steering wheel to conduct steering performance testing, a detection device arranged in the box body for assisting in the testing, and a pushing device arranged in the box body for driving the box body to open and close. The testing device includes a control device, an adjusting member arranged on one side of the control device, a lower connecting claw arranged below the adjusting member, curved rods symmetrically arranged on both sides of the control device, a side connecting claw arranged at the end of the curved rod far from the control device, and a steering handwheel arranged on one of the side connecting claws; the pushing device includes push rods symmetrically arranged on both sides inside the box body and hinged to it, a slider hinged to the other end of the push rod, and a positioning member for positioning the slider. The present invention can avoid blocking the surface buttons of the steering wheel, will not affect the normal use of the vehicle during dynamic testing, and improves the safety of the driver.

Description

Technical Field

[0001] The present invention belongs to the technical field of steering performance testing, and particularly relates to an automobile steering performance testing device and method. Background Art

[0002] Automobile steering performance testing is a process of detecting and evaluating various performance indicators of an automobile steering system, aiming to ensure the safety, reliability, and controllability of the automobile steering system. The main test contents include: steering lightness test, measuring the force required by the driver to turn the steering wheel and evaluating whether the power assist effect of the steering system is appropriate; steering accuracy test, checking the matching degree between the rotation angle of the steering wheel and the actual steering angle of the wheels; steering stability test, examining whether the steering system can keep the vehicle running stably during driving; steering return performance test, when the driver completes the steering operation, observing whether the steering system can automatically return the wheels to the straight-ahead driving position, as well as the speed and accuracy of the return; steering system response test, detecting the reaction speed of the steering system to the driver's operation, that is, the time delay from when the driver turns the steering wheel to when the wheels start to turn.

[0003] During the existing steering performance test, the driver needs to horizontally install the steering parameter tester on the steering wheel and then can conduct the test. After installation, the steering parameter tester will block the surface buttons of the steering wheel to a certain extent. During dynamic testing, it may affect the normal use of the vehicle, increasing the risk of safety accidents and reducing the safety of the driver. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide an automobile steering performance testing device and method, which can avoid blocking the surface buttons of the steering wheel, so that during dynamic testing, it will not affect the normal use of the vehicle.

[0005] To achieve the above purpose, the present invention is realized through the following technical solutions: An automobile steering performance testing device includes a box body, a testing device placed in the box body for connecting with the steering wheel to conduct steering performance testing, a detection device arranged in the box body for assisting the testing, and a pushing device arranged in the box body for driving the box body to open and close, wherein:

[0006] The testing device includes a control device, an adjusting member arranged on one side of the control device, a lower connecting claw arranged below the adjusting member, curved rods symmetrically arranged on both sides of the control device, side connecting claws arranged at the ends of the curved rods far from the control device, and a steering handwheel arranged on one of the side connecting claws. The adjusting member cooperates with the curved rods to adjust the distance between the two side connecting claws.

[0007] The testing device also includes a locking member, which is disposed on the adjusting member and is used to lock the adjusting member after the opposite connecting claw is adjusted;

[0008] The pushing device comprises push rods symmetrically arranged on both sides of the box body and hingedly connected thereto, a sliding block hingedly connected to the other end of the push rods, and a positioning member used for positioning the sliding block.

[0009] Preferably, the adjusting member includes an adjusting box, an adjusting block, a main gear and a slave gear. The adjusting box is installed on the side of the control device. Two meshing main gears are arranged in the adjusting box. The adjusting block is arranged above the outside of the adjusting box and extends into the adjusting box from top to bottom. The lower end of the adjusting block is installed on one of the main gears. The slave gears are symmetrically arranged on both sides of the adjusting box, and the slave gears on the same side are meshingly connected with the main gears on that side. The slave gears are fixedly connected to the end of the curved rod member away from the side connecting claw.

[0010] Preferably, the locking member includes a ratchet gear, a limit member and a limit torsion spring. The ratchet gear is arranged in the adjustment box and installed above the main gear, and is coaxially arranged with the adjustment block and the main gear; the limit member is arranged on the side of the ratchet gear away from the control device, and is movably abutted with the ratchet gear. The limit member includes an abutting portion and a toggle portion. The limit torsion spring is installed above the connection between the abutting portion and the toggle portion. The abutting portion is used to connect with the tooth groove on the ratchet gear to lock the ratchet gear. The toggle portion extends to the outside of the adjustment box, and the toggle portion is connected through a toggle groove matched with it, and the toggle groove is opened on the side wall of the adjustment box.

[0011] Preferably, the curved rod member includes a first curved rod, a second curved rod, a first stud and a first clamping block, one end of the first curved rod is mounted on the slave gear, and the first stud is mounted below the other end of the first curved rod; the second curved rod is provided with an adjustment groove matched with the first stud, the first stud passes through the adjustment groove, the first clamping block is sleeved on the outside of the first stud and is threadedly connected to the first stud, and is arranged between the first curved rod and the second curved rod for squeezing the second curved rod; the first studs on both sides have different heights, so that the second curved rods on both sides are staggered up and down, when the testing device is not in use, a section of the second curved rods on both sides with the adjustment groove is overlapped up and down, and the second stud passes through the overlapping part of the two second curved rods, the second stud is sleeved on the outside of the second stud and is threadedly connected to the first clamping block, and the second clamping block is arranged above the upper second curved rod for squeezing the two second curved rods.

[0012] Preferably, the lower connecting claw is installed at the bottom of the adjustment box. The lower connecting claw is used to be clamped on the side of the steering wheel that slopes downward. Elastic cards are respectively arranged at the top and bottom inside the lower connecting claw; the side connecting claw is rotatably installed at one end of the second curved rod away from the first curved rod. The side connecting claw is used to be clamped on the side of the steering wheel. An extrusion block is arranged at the bottom of the side connecting claw. An adjustment screw rod is installed at the bottom of the extrusion block. The adjustment screw rod is threadedly connected to the bottom of the side connecting claw; convex balls are arranged in an array at the top of the extrusion block, and convex strips are arranged in an array at the top inside the side connecting claw.

[0013] Preferably, the box body includes a placement box and a box cover connected thereto. A storage pad for storing the test device is arranged in the placement box. A detection device for detecting whether the wheel rotates is installed inside the box cover; two groups of positioning members are arranged in the placement box on the same side, and are successively the starting positioning member and the ending positioning member, respectively used for positioning the slider when it does not move and positioning the slider after it moves, so as to realize the opening and closing of the box cover.

[0014] Preferably, one end of the push rod is hinged and arranged inside the box cover. Installation grooves adapted to the push rod are respectively opened above the two side walls of the placement box. A sliding groove is connected to the outside of the installation groove on the outer side. The sliding groove is opened on the outer side wall of the placement box. The slider penetrates through the installation groove into the sliding groove and extends to the outside of the placement box; the positioning member includes a plug rod and a connecting spring. The plug rod includes a rod portion and a convex plate portion. The convex plate portion is arranged in the middle of the rod portion and extends to the outside of the placement box. The connecting spring is sleeved on the rod portion above the convex plate portion. The lower end of the rod portion below the convex plate portion extends into the slider. A moving groove adapted to the positioning member is opened above the inner side of the sliding groove.

[0015] An automobile steering performance test method, applied to the above-mentioned automobile steering performance test device, includes the following steps:

[0016] Based on the sensor, obtain the test device parameters and store them in the database. The test device parameters include steering wheel angle, front wheel steering angle, steering force, and steering torque;

[0017] Obtain the vehicle initial parameters stored in the database. The vehicle initial parameters include vehicle mass, wheelbase, front wheel cornering stiffness, and rear wheel cornering stiffness;

[0018] Based on the external influence parameters stored in the database, analyze and obtain the influence error matching value. Based on the influence error matching value, obtain the influence error value;

[0019] Obtain the performance evaluation model stored in the database. Based on the test device parameters, vehicle initial parameters, and influence error value, obtain the performance evaluation result;

[0020] Output the performance evaluation result to the control device.

[0021] Preferably, the influence error value is obtained, which specifically includes the following steps: The external influence parameters include the friction coefficient between the tire and the road surface and the air resistance; Obtain a set of matched external influence parameters, which includes multiple groups of matched external influence parameters. The matched external influence parameters include the friction coefficient matching value between the tire and the road surface and the air resistance matching value; Comprehensively analyze the friction coefficient between the tire and the road surface, the control resistance, the friction coefficient matching values between each tire and the road surface, and the air resistance matching values to obtain the influence error matching values for each; Obtain the matched external influence parameters corresponding to the smallest influence error matching value. The influence error value stored in the database corresponding to this matched external influence parameter is the influence error value corresponding to the external influence parameter; The friction coefficient between the tire and the road surface The calculation formula is:

[0022] ;

[0023] In the formula, is the friction coefficient of the dry road surface, k is the road surface correction coefficient; The calculation formula for the air resistance F is:

[0024] ;

[0025] In the formula, is the air density, is the air resistance coefficient, A is the frontal area of the vehicle, v is the vehicle speed; The calculation formula for the influence error matching value is:

[0026] ;

[0027] In the formula, is the m-th influence error matching value, is the current friction coefficient between the tire and the road surface, is the m-th friction coefficient matching value between the tire and the road surface, is the current air resistance, is the m-th control resistance matching value, is 's weight factor, is 's weight factor, e is the natural constant, m is the label of the matched external influence parameter.

[0028] Preferably, based on the test device parameters, the vehicle initial parameters, and the influence error value, a performance evaluation result is obtained, which specifically includes the following steps: The performance evaluation model includes a neural network model and a support vector machine; Input the test device parameters, the vehicle initial parameters, and the influence error value into the neural network model to obtain a first evaluation value; Input the test device parameters, the vehicle initial parameters, and the influence error value into the support vector machine model to obtain a second evaluation value; Analyze the first evaluation value and the second evaluation value to obtain a comprehensive evaluation value;

[0029] Compare the comprehensive evaluation value with the performance evaluation threshold stored in the database. If the comprehensive evaluation value is less than the performance evaluation threshold, the vehicle steering performance is at level two, and the performance evaluation result is abnormal; if the comprehensive evaluation value is not less than the performance evaluation threshold, the vehicle steering performance is at level one, and the performance evaluation result is normal; the calculation formula for the comprehensive evaluation value is:

[0030] ;

[0031] In the formula, is the comprehensive evaluation value, is the first evaluation value, is the second evaluation value, is 's weight factor, is 's weight factor.

[0032] The present invention has the following beneficial effects:

[0033] By using the adjusting member, curved rod member, locking member, side connecting claw and lower connecting claw provided in the device of the present invention, the side connecting claw and the lower connecting claw can be firmly installed on the steering wheel in an inverted triangular shape. After installation, the first curved rod and the second curved rod are adjusted to avoid blocking the surface buttons of the steering wheel, so that during dynamic testing, the normal use of the vehicle will not be affected, improving the safety of the driver.

[0034] By using the adjusting member, curved rod member and locking member provided in the device of the present invention, the distance between the two side connecting claws can be adjusted according to the diameter of the steering wheel, and after adjustment, the adjusting block is locked and limited to avoid affecting the subsequent installation effect, and the device has high applicability.

[0035] By using the testing device, detection device, placement box, box cover, push rod, slider and positioning member provided in the device of the present invention, the vehicle tires can be monitored from the outside during static testing to assist the testing in the static state. One person can complete the overall testing operation, reducing human resources, and according to needs, the placement box can be retracted during dynamic testing, making it flexible to use.

[0036] By using the adjusting member, curved rod member, second stud and second pressing block provided in the device of the present invention, after the testing device is used, the two second curved rods are overlapped and limited, and they are pressed by the second stud and the second pressing block, then the testing device can be carried by hand and moved, which is convenient for carrying and moving and easy to use.

[0037] By introducing an error matching value, the method of the present invention can accurately reflect the steering performance of the vehicle in the actual use environment, making the test results closer to the real driving scenario, and can adapt to different external environmental conditions, with high flexibility and adaptability. It can reflect the impact of external environmental changes on the vehicle's steering performance in real time, facilitating subsequent analysis and optimization, avoiding errors caused by subjective judgment, and providing data support for the design and optimization of the vehicle's steering system. It is not only convenient for intuitively judging the vehicle's steering performance status, but also provides a clear and reliable basis for vehicle performance monitoring, improvement, and related decision-making, improving the accuracy and reliability of vehicle steering performance evaluation. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic structural diagram of the device of the present invention;

[0039] Figure 2 for the present invention Figure 1 is a schematic structural diagram from another perspective;

[0040] Figure 3 is a schematic structural diagram of the adjustment box and the lower connecting claw of the present invention;

[0041] Figure 4 is a schematic structural diagram of the side connecting claw of the present invention;

[0042] Figure 5 is a schematic structural diagram of the lower connecting claw of the present invention;

[0043] Figure 6 is a schematic structural diagram of the first stud and the first pressing block of the present invention after being disassembled;

[0044] Figure 7 is a schematic structural diagram of the interior of the adjustment box of the present invention;

[0045] Figure 8 is a schematic structural diagram of two second curved rods overlapping of the present invention;

[0046] Figure 9 is a schematic structural diagram of the interior of the placement box of the present invention;

[0047] Figure 10 is a schematic structural diagram of the slider and the insertion rod connection of the present invention;

[0048] Figure 11 is a schematic structural diagram during the use of the present invention;

[0049] Figure 12 is a schematic flow diagram of the method of the present invention.

[0050] In the figure, 1, control device; 2, adjustment box; 3, adjustment block; 4, main gear; 5, ratchet gear; 6, limit piece; 7, limit torsion spring; 8, toggle slot; 9, slave gear; 10, first curved rod; 11, second curved rod; 12, adjustment slot; 13, first stud; 14, first clamping block; 15, lower connecting claw; 16, elastic card; 17, side connecting claw; 18, extrusion block; 19, adjustment screw; 20, steering hand wheel; 21, second stud; 22, second clamping block; 23, placement box; 24, box cover; 25, storage pad; 26, detection device; 27, push rod; 28, slider; 29, insertion rod; 30, connecting spring; 31, moving slot; 32, installation slot; 33, sliding slot. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0052] like Figures 1 - 11 As shown, the automobile steering performance test device comprises a box, a test device placed in the box for connecting with a steering wheel to perform a steering performance test, a detection device 26 arranged in the box for auxiliary testing, and a pushing device arranged in the box for driving the box to open and close, wherein: the test device comprises a control device 1, an adjustment member arranged on one side of the control device 1, a lower connecting claw 15 arranged below the adjustment member, a curved rod member symmetrically arranged on both sides of the control device 1, a side connecting claw 17 arranged at one end of the curved rod member away from the control device 1, and a steering handle arranged on one side of the side connecting claw 17. Wheel 20, an angle sensor is provided in the control device 1, and a display screen is provided on the surface of the control device 1, a force sensor is provided in the steering handwheel 20, and the adjusting member cooperates with the curved rod member to adjust the distance between the side connecting claws 17 on both sides; the testing device also includes a locking member, which is arranged on the adjusting member and is used to lock the adjusting member after adjusting the side connecting claws 17; the pushing device includes push rods 27 symmetrically arranged on both sides of the box body and hingedly connected to it, a slider 28 hinged at the other end of the push rod 27, and a positioning member for positioning the slider 28.

[0053] The adjusting member includes an adjusting box 2, an adjusting block 3, a main gear 4 and a slave gear 9. The adjusting box 2 is installed on the side of the control device 1. Two meshing main gears 4 are arranged in the adjusting box 2. The adjusting block 3 is arranged above the outside of the adjusting box 2 and extends from top to bottom into the adjusting box 2. The lower end of the adjusting block 3 is installed on one of the main gears 4. The slave gears 9 are symmetrically arranged on both sides of the adjusting box 2, and the slave gears 9 on the same side are meshed and connected with the main gears 4 on that side. The slave gears 9 are fixedly connected to the end of the curved rod member away from the side connecting claw 17.

[0054] In this embodiment, the control device 1 and the adjustment box 2 are an integrated structure, the main gear 4 and the slave gear 9 are both rotatably installed in the adjustment box 2, and the adjustment block 3 is rotated to drive one main gear 4 to rotate to one side through the adjustment block 3, drive a slave gear 9 meshing with it to rotate, and drive another slave gear 9 to rotate through another main gear 4. According to needs, the two slave gears 9 are rotated to a relatively distant side, or the lock is released so that the two slave gears 9 are rotated to a relatively close side, thereby achieving the purpose of adjusting the distance between the two side connecting claws 17 to adapt to steering wheels of different diameters.

[0055] The locking member includes a ratchet gear 5, a limit member 6 and a limit torsion spring 7. The ratchet gear 5 is arranged in the adjustment box 2 and installed above the main gear 4, and is coaxially arranged with the adjustment block 3 and the main gear 4; the limit member 6 is arranged on the side of the ratchet gear 5 away from the control device 1, and is movably abutted with the ratchet gear 5. The limit member 6 includes an abutting portion and a toggle portion. The limit torsion spring 7 is installed above the connection between the abutting portion and the toggle portion. The abutting portion is used to connect with the tooth groove on the ratchet gear 5 to lock the ratchet gear 5. The toggle portion extends to the outside of the adjustment box 2, and the toggle portion is connected through a toggle groove 8 that is compatible with it. The toggle groove 8 is opened on the side wall of the adjustment box 2.

[0056] In this embodiment, when the adjusting block 3 is rotated inward, the ratchet gear 5 is driven to rotate, and the abutment portion is bounced open, and the adjustment can be completed. When the adjusting block 3 is released, the limit torsion spring 7 drives the limit member 6 to reset, and the abutment portion is locked in the groove of the ratchet gear 5, thereby realizing the limit locking of the ratchet gear 5 and the adjusting block 3 installed thereon, thereby realizing the locking of the main gear 4 and stopping the adjustment. When it is necessary to rotate the adjusting block 3 outward, the toggle portion is toggled to move it in the toggle groove 8, and the abutment portion is separated from the ratchet gear 5, and the adjusting block 3 can be rotated in the reverse direction.

[0057] The bent rod member includes a first bent rod 10, a second bent rod 11, a first stud 13 and a first clamping block 14. One end of the first bent rod 10 is mounted on the slave gear 9, and the first stud 13 is mounted below the other end of the first bent rod 10; the second bent rod 11 is provided with an adjustment groove 12 adapted to the first stud 13, the first stud 13 runs through the adjustment groove 12, the first clamping block 14 is sleeved outside the first stud 13 and is threadedly connected thereto, and is arranged between the first bent rod 10 and the second bent rod 11, for adjusting the second bent rod 11. The rod 11 is extruded; the first studs 13 on both sides are different in height, so that the second curved rods 11 on both sides are staggered up and down. When the testing device is not in use, the second curved rods 11 on both sides have a section of adjustment slots 12 that overlap up and down, and the overlapping part of the two second curved rods 11 is penetrated by a second stud 21. The second stud 21 is externally sleeved with a second clamping block 22 threadedly connected thereto. The second clamping block 22 is arranged above the upper second curved rod 11 for squeezing the two second curved rods 11.

[0058] In this embodiment, the first curved rod 10 and the first stud 13 are of an integral structure. After the two side connecting claws 17 are connected to the steering wheel, turn the two first pressing blocks 14 upward to release the extrusion on the second curved rod 11, move the lower connecting claw 15, and the first stud 13 slides in the adjustment groove 12, changing the inclination angle of the second curved rod 11 until the lower connecting claw 15 is clamped to the lower edge of the steering wheel. Observe whether the first curved rod 10 and the second curved rod 11 block the surface buttons of the steering wheel. If they do, rotate the adjustment block 3 to rotate the first curved rod 10 outward from the steering wheel, driving the second curved rod 11 to rotate outward until both the first curved rod 10 and the second curved rod 11 do not block the surface buttons of the steering wheel, then stop rotating. This can avoid blocking the surface buttons of the steering wheel and prevent affecting the normal use of the vehicle during the vehicle movement test.

[0059] When the test device is no longer in use, turn the first pressing block 14 upward to release the pressing on the second curved rod 11, rotate the adjustment block 3 to rotate the first curved rod 10 until it abuts against both sides of the adjustment box 2 away from the control device 1, push the second curved rod 11 to make the position of the side connecting claw 17 on the second curved rod 11 face outward, then turn the first pressing block 14 downward to press the second curved rod 11. The two second curved rods 11 overlap and the second stud 21 passes through the two second curved rods 11 from bottom to top. Screw on the second pressing block 22 to press the two second curved rods 11 to make them immovable. You can hold the overlapping part of the two second curved rods 11 to carry the whole test device by hand and put it into the storage pad 25 for storage.

[0060] The lower connecting claw 15 is installed at the bottom of the adjustment box 2. The lower connecting claw 15 is used to be clamped on the downward-inclined side of the steering wheel. Elastic cards 16 are respectively arranged at the top and bottom inside the lower connecting claw 15; the side connecting claw 17 is rotatably installed at one end of the second curved rod 11 away from the first curved rod 10. The side connecting claw 17 is used to be clamped on the side of the steering wheel. An extrusion block 18 is arranged at the bottom of the side connecting claw 17, and an adjustment screw 19 is installed at the bottom of the extrusion block 18. The adjustment screw 19 is threadedly connected to the bottom of the side connecting claw 17; convex balls are arranged in an array at the top of the extrusion block 18, and convex strips are arranged in an array at the top inside the side connecting claw 17.

[0061] In this embodiment, the elastic cards 16 are welded to the inside of the lower connecting claw 15. When the lower connecting claw 15 is clamped to the steering wheel, the steering wheel presses the elastic cards 16. Through the upper and lower elastic cards 16, the lower connecting claw 15 is firmly installed on the steering wheel. When the side connecting claw 17 is clamped to the steering wheel, turn the adjustment screw 19 to move the extrusion block 18 upward. Through the convex balls on the extrusion block 18 and the convex strips inside the side connecting claw 17, the friction between the side connecting claw 17 and the extrusion block 18 and the steering wheel is increased, so as to firmly install the side connecting claw 17 on the steering wheel for subsequent test operations.

[0062] The box body includes a placement box 23 and a box cover 24 connected thereto. A storage pad 25 for storing the test device is provided in the placement box 23, and a detection device 26 for detecting whether the wheel rotates is installed on the inner side of the box cover 24. Two groups of positioning members are provided in the placement box 23 on the same side, which are successively a starting positioning member and an end positioning member, respectively used for positioning the slider 28 when it does not move and positioning the slider 28 after it moves, so as to realize the opening and closing of the box cover 24. One end of the push rod 27 is hinged and arranged on the inner side of the box cover 24. Installation grooves 32 adapted to the push rod 27 are respectively opened above the two side walls of the placement box 23. The outer side of the installation groove 32 is connected through a sliding groove 33, and the sliding groove 33 is opened on the outer side wall of the placement box 23. The slider 28 penetrates from the installation groove 32 into the sliding groove 33 and extends to the outside of the placement box 23. The positioning member includes a plug rod 29 and a connecting spring 30. The plug rod 29 includes a rod portion and a convex plate portion. The convex plate portion is arranged in the middle of the rod portion and extends to the outside of the placement box 23. The connecting spring 30 is sleeved on the rod portion above the convex plate portion. The lower end of the rod portion below the convex plate portion extends into the slider 28. A moving groove 31 adapted to the positioning member is opened above the inner side of the sliding groove 33.

[0063] In this embodiment, when it is necessary to take out the test device or open the box cover 24, the plug rod 29 in the starting point positioning member is toggled upward, the connecting spring 30 is compressed, the plug rod 29 at this position moves upward, the limit on the slider 28 is released, and the same operation is performed on the other side. At the same time, the slider 28 is pushed, so that the push rod 27 pushes the box cover 24 to flip and open until the slider 28 moves to the position of the end positioning member. The plug rods 29 in the end positioning members on both sides are toggled upward, so that the slider 28 moves below the plug rod 29, and the plug rod 29 is released. The connecting spring 30 at this place is reset, so that the plug rod 29 moves downward and is clamped into the slider 28 to position it. At this time, the box cover 24 is opened at a 90-degree angle, and the test device can be taken out and installed on the steering wheel. If a static test is to be performed, the placement box 23 is placed in front of the wheel on one side, and the wheel is monitored by the detection device 26. When the wheel is about to rotate, the driver is reminded to stop turning the steering wheel, so as to complete the static steering performance test. If it is a dynamic test, the placement box 23 is placed in a safe position to avoid accidental injury and damage.

[0064] An automobile steering performance test method, as Figure 12 shown, includes the following steps: obtaining test device parameters based on sensors and storing them in a database. The test device parameters include steering wheel angle, front wheel steering angle, steering force, and steering torque; obtaining the initial vehicle parameters stored in the database. The initial vehicle parameters include vehicle mass, wheelbase, front wheel cornering stiffness, and rear wheel cornering stiffness; analyzing to obtain an influence error matching value based on the external influence parameters stored in the database, and obtaining an influence error value based on the influence error matching value.

[0065] The external influence parameters include the friction coefficient between the tire and the road surface and the air resistance; obtain a set of matched external influence parameters, which includes multiple groups of matched external influence parameters. The matched external influence parameters include the friction coefficient matching value between the tire and the road surface and the air resistance matching value; comprehensively analyze the friction coefficient between the tire and the road surface, the control resistance, the friction coefficient matching values between each tire and the road surface, and the air resistance matching values to obtain the matching influence error values for each; obtain the matched external influence parameter corresponding to the smallest matching influence error value, and the influence error value stored in the database corresponding to this matched external influence parameter is the influence error value corresponding to the external influence parameter.

[0066] The friction coefficient between the tire and the road surface The calculation formula is:

[0067] ;

[0068] In the formula, is the friction coefficient of the dry road surface, and k is the road surface correction coefficient.

[0069] The calculation formula for the air resistance F is:

[0070] ;

[0071] In the formula, is the air density, is the air resistance coefficient, A is the frontal area of the vehicle, and v is the vehicle speed.

[0072] The calculation formula for the matching influence error value is:

[0073] ;

[0074] In the formula, is the m-th matching influence error value, is the current friction coefficient between the tire and the road surface, is the m-th friction coefficient matching value between the tire and the road surface, is the current air resistance, is the m-th control resistance matching value, is the weight factor of is the weight factor of, e is the natural constant, and m is the label of the matched external influence parameter.

[0075] Traditional testing methods usually assume ideal conditions (such as dry road surface, windless environment). However, in the actual driving environment, road conditions and air resistance can significantly affect the vehicle's steering performance. By introducing external influence parameters (such as the friction coefficient between the tire and the road surface, air resistance) and their error matching values, the steering performance of the vehicle in the actual usage environment can be accurately reflected. By dynamically adjusting the external influence parameters, the test results are closer to the real driving scenario. The vehicle's steering performance not only depends on the mechanical characteristics of the vehicle itself but is also affected by the external environment (such as slippery road surface, wind speed). The introduction of external environmental factors makes the test results more comprehensive.

[0076] By matching the set of external influence parameters, various external environmental conditions can be simulated. It can adapt to different external environmental conditions (such as rainy days, snowy days, windy days) and dynamically adjust the test parameters. Dynamically calculate the influence error matching value, which can reflect the impact of external environmental changes on the vehicle's steering performance in real time.

[0077] Using clear mathematical models (such as the friction coefficient formula, air resistance formula, influence error matching value formula) for calculation, the test results are scientific and reproducible, facilitating subsequent analysis and optimization, and avoiding errors caused by subjective judgment.

[0078] By adjusting and matching the set of external influence parameters, different test scenarios (such as dry road surface, slippery road surface, ice and snow road surface) can be simulated. It is applicable to a variety of test scenarios, including laboratory tests, actual road tests, extreme environment tests, etc., and has high flexibility and adaptability. The test results can reflect the steering performance of the vehicle under different external environments. Based on the test results, data support can be provided for the design and optimization of the vehicle's steering system.

[0079] Obtain the performance evaluation model stored in the database. Based on the test device parameters, vehicle initial parameters, and influence error values, obtain the performance evaluation result; output the performance evaluation result to the control device 1.

[0080] The performance evaluation model includes a neural network model and a support vector machine; input the test device parameters, vehicle initial parameters, and influence error values into the neural network model to obtain the first evaluation value; input the test device parameters, vehicle initial parameters, and influence error values into the support vector machine model to obtain the second evaluation value; analyze the first evaluation value and the second evaluation value to obtain a comprehensive evaluation value; compare the comprehensive evaluation value with the performance evaluation threshold stored in the database. If the comprehensive evaluation value is less than the performance evaluation threshold, the vehicle's steering performance is level two, and the performance evaluation result is abnormal; if the comprehensive evaluation value is not less than the performance evaluation threshold, the vehicle's steering performance is level one, and the performance evaluation result is normal.

[0081] The test device parameters, vehicle initial parameters, and error value affecting factors are organized into the input format of the model, which is the input vector X, and then input into the neural network model to obtain the first evaluation value. The neural network model includes an input layer, a hidden layer, and an output layer. The input layer includes 9 nodes (corresponding to 9 input parameters), and the output layer includes 1 node (outputting the first evaluation value).

[0082] The output of the neural network model is:

[0083] ;

[0084] In the formula, is the output value of the hidden layer, f and g are activation functions, is the weight matrix of the hidden layer, is the bias vector of the hidden layer, is the weight matrix of the output layer, is the bias vector of the output layer, is the first evaluation value.

[0085] The input vector X is input into the support vector machine model to obtain the second evaluation value. The support vector machine model includes a kernel function, a radial basis function.

[0086] The output of the support vector machine is:

[0087] ;

[0088] In the formula, is the weight of the support vector, is the kernel function, is the feature vector of the a-th support vector, b is the bias term, a is the index of the support vector, n is the total number of support vectors, is the second evaluation value.

[0089] The calculation formula for the comprehensive evaluation value is:

[0090] ;

[0091] In the formula, is the comprehensive evaluation value, is 's weight factor, is 's weight factor.

[0092] Taking full advantage of the data stored in the database, combining the results of the two models from different angles to analyze the data, the advantages of the two models are combined to improve the accuracy of the evaluation. By comparing with the performance evaluation threshold stored in the database, the vehicle steering performance level and evaluation results are clarified, which is convenient for intuitively judging the vehicle steering performance status, and provides a clear and reliable basis for vehicle performance monitoring, improvement and related decision-making, thus improving the accuracy and reliability of vehicle steering performance evaluation.

[0093] When in use, the rod 29 in the starting point positioning piece is pushed upward, the connecting spring 30 is compressed, and the rod 29 at this position moves upward to release the limit on the slider 28. The same operation is performed on the other side, and the slider 28 is pushed at the same time, so that the push rod 27 pushes the box cover 24 to flip and open until the slider 28 moves to the position of the end positioning piece. The rods 29 in the end positioning pieces on both sides are pushed upward, so that the slider 28 moves to the rod 29 The lower part, the rod 29 is released, and the connecting spring 30 there is reset, so that the rod 29 moves down and is stuck in the slider 28 to position it. At this time, the box cover 24 is opened at ninety degrees. Holding the overlapping connection of the two second curved rods 11 in a storage shape, the test device can be taken out, and the second stud 21 and the second clamping block 22 are removed.

[0094] Hold the control device 1 and the adjustment box 2, so that the two side connecting claws 17 are moved, the toggle part is toggled to move in the toggle groove 8, the abutment part is separated from the ratchet gear 5, and the adjustment block 3 is rotated in the opposite direction, so that the slave gear 9 drives the first crank 10 and the second crank 11 to rotate toward the side close to the steering wheel, and the two side connecting claws 17 are placed on both sides of the middle position of the steering wheel so that the groove positions thereof are aligned with the edge of the steering wheel, and the adjustment block 3 is continued to be rotated so that the two side connecting claws 17 are moved toward the position of the steering wheel on the same horizontal line until the two side connecting claws 17 are both stuck to the outside of the steering wheel, and the adjusting screw 19 is screwed to move the extrusion block 18 upward, and the convex ball on the extrusion block 18 is engaged with the side connecting claw 1 7, fasten the side connecting claw 17 on the steering wheel, then screw the first pressing block 14 to release the pressing on the second curved rod 11, move the lower connecting claw 15 to make it clamped to the middle position below the outer edge of the steering wheel, and the elastic card 16 makes the lower connecting claw 15 fasten on the steering wheel, observe whether the first curved rod 10 and the second curved rod 11 block the buttons on the steering wheel surface. If so, rotate the adjusting block 3 to make the first curved rod 10 rotate outward of the steering wheel, driving the second curved rod 11 to rotate outward, until the first curved rod 10 and the second curved rod 11 do not block the buttons on the steering wheel surface, then stop rotating and test can be carried out. If not, test can be carried out directly.

[0095] If a static test is to be carried out, place the placement box 23 in front of the wheel on one side, monitor the wheel through the detection device 26, and the driver turns the steering wheel through the steering handwheel 20. When the wheel is about to rotate, remind the driver to stop turning the steering wheel, so as to complete the static steering performance test. If it is a dynamic test, place the placement box 23 in a safe position to avoid accidental injury and damage.

Claims

1. Automobile steering performance testing device, characterized in that: The invention comprises a box, a test device placed in the box and connected to a steering wheel for testing steering performance, a detection device (26) arranged in the box for assisting the test, and a driving device arranged in the box for driving the box to open and close, wherein: The testing device comprises a control device (1), an adjusting member arranged at one side of the control device (1), a lower connecting claw (15) arranged below the adjusting member, a bent rod member symmetrically arranged at both sides of the control device (1), a side connecting claw (17) arranged at an end of the bent rod member away from the control device (1), and a steering hand wheel (20) arranged on one side of the side connecting claw (17), wherein the adjusting member cooperates with the bent rod member to adjust the distance between the side connecting claws (17) on both sides; The testing device also includes a locking member, which is arranged on the adjusting member and is used to lock the adjusting member after the opposite connecting claw (17) is adjusted; The pushing device comprises push rods (27) symmetrically arranged on both sides of the box body and hingedly connected thereto, a slider (28) hingedly connected to the other end of the push rods (27), and a positioning member for positioning the slider (28).

2. The vehicle steering performance testing device according to claim 1, characterized in that: The regulating member comprises a regulating box (2), a regulating block (3), a main gear (4) and a slave gear (9); the regulating box (2) is mounted on a side of the control device (1); two meshing main gears (4) are arranged in the regulating box (2); the regulating block (3) is arranged above the outside of the regulating box (2) and extends from top to bottom into the regulating box (2); and its lower end is mounted on one of the main gears (4); The slave gears (9) are symmetrically arranged on both sides of the regulating box (2), and the slave gears (9) on the same side are meshed and connected with the main gear (4) on that side, and the slave gears (9) are fixedly connected to the end of the curved rod member away from the side connecting claw (17).

3. The vehicle steering performance testing device according to claim 2, characterized in that: The locking member comprises a ratchet gear (5), a limiting member (6) and a limiting torsion spring (7); the ratchet gear (5) is arranged in the adjustment box (2) and installed above the main gear (4), and is coaxially arranged with the adjustment block (3) and the main gear (4); The limiting member (6) is arranged on a side of the ratchet gear (5) away from the control device (1) and is movably abutted against the ratchet gear (5). The limiting member (6) comprises an abutting portion and a toggle portion. A limiting torsion spring (7) is installed above the connection between the abutting portion and the toggle portion. The abutting portion is used to connect with the tooth groove on the ratchet gear (5) to lock the ratchet gear (5). The toggle portion extends to the outside of the adjustment box (2), and the toggle portion is connected through a toggle groove (8) matched therewith. The toggle groove (8) is arranged on the side wall of the adjustment box (2).

4. The vehicle steering performance testing device according to claim 3, characterized in that: The bent rod member comprises a first bent rod (10), a second bent rod (11), a first stud (13) and a first pressing block (14); one end of the first bent rod (10) is mounted on the slave gear (9), and the first stud (13) is mounted below the other end of the first bent rod (10); The second curved rod (11) is provided with an adjustment groove (12) adapted to the first stud (13), the first stud (13) passes through the adjustment groove (12), the first pressing block (14) is sleeved outside the first stud (13) and is threadedly connected thereto, and is arranged between the first curved rod (10) and the second curved rod (11) for pressing the second curved rod (11); The first studs (13) on both sides have different heights, so that the second curved rods (11) on both sides are arranged in an up-and-down offset manner. When the test device is not in use, the second curved rods (11) on both sides have a section with an adjustment slot (12) in an up-and-down overlapping state, and a second stud (21) is arranged through the overlapping part of the two second curved rods (11). The second stud (21) is sleeved with a second clamping block (22) threadedly connected thereto. The second clamping block (22) is arranged above the upper second curved rod (11) and is used to squeeze the two second curved rods (11).

5. The vehicle steering performance testing device according to claim 4, characterized in that: The lower connecting claw (15) is installed at the bottom of the adjustment box (2), and the lower connecting claw (15) is used to be clamped on the side of the steering wheel that is tilted downward, and the top and bottom of the inner side of the lower connecting claw (15) are respectively provided with elastic cards (16); The side connecting claw (17) is rotatably mounted on an end of the second curved rod (11) away from the first curved rod (10), the side connecting claw (17) is used to be clamped on the side of the steering wheel, an extrusion block (18) is arranged at the bottom of the side connecting claw (17), an adjusting screw (19) is installed at the bottom of the extrusion block (18), and the adjusting screw (19) is threadedly connected to the bottom of the side connecting claw (17); The top array of the extrusion block (18) is provided with convex balls, and the top array of the inner side of the side connection claw (17) is provided with convex strips.

6. The vehicle steering performance testing device according to claim 1, characterized in that: The box body comprises a storage box (23) and a box cover (24) connected thereto; a storage pad (25) for storing the test device is arranged in the storage box (23); and a detection device (26) for detecting whether the wheel is rotating is installed inside the box cover (24); Two sets of positioning members are provided in the placement box (23) on the same side, and are respectively a starting positioning member and an end positioning member, which are used to position the slider (28) when it is not moved and to position the slider (28) after it is moved, so as to realize the opening and closing of the box cover (24).

7. The vehicle steering performance testing device according to claim 6, characterized in that: One end of the push rod (27) is hingedly arranged on the inner side of the box cover (24); mounting grooves (32) adapted to the push rod (27) are respectively provided above the two side walls of the placement box (23); a sliding groove (33) is connected to the outer side of the mounting groove (32); the sliding groove (33) is provided on the outer side wall of the placement box (23); the sliding block (28) passes through the sliding groove (33) from the mounting groove (32) and extends to the outside of the placement box (23); The positioning member comprises an insert rod (29) and a connecting spring (30), the insert rod (29) comprising a rod portion and a convex plate portion, the convex plate portion being arranged in the middle of the rod portion and extending to the outside of the placement box (23), the connecting spring (30) being sleeved on the outside of the rod portion above the convex plate portion, the lower end of the rod portion below the convex plate portion extending into the slider (28), and a moving groove (31) adapted to the positioning member is provided on the upper inner side of the sliding groove (33).

8. A method for testing the steering performance of an automobile, applied to the device for testing the steering performance of an automobile according to any one of claims 1 to 7, characterized in that: The following steps are involved: Acquire test device parameters based on sensors and store them in a database, the test device parameters including steering wheel angle, front wheel steering angle, steering force, and steering torque; Obtaining initial vehicle parameters stored in a database, the initial vehicle parameters including vehicle mass, wheelbase, front wheel cornering stiffness, and rear wheel side panel stiffness; Based on the external influence parameters stored in the database, an influence error matching value is obtained through analysis, and based on the influence error matching value, an influence error value is obtained; Obtaining a performance evaluation model stored in a database, and obtaining a performance evaluation result based on test device parameters, vehicle initial parameters, and influencing error values; The performance evaluation results are output to the control device (1).

9. The vehicle steering performance testing method according to claim 8, characterized in that: The obtaining of the influence error value specifically comprises the following steps: External influencing parameters include the friction coefficient between the tire and the road and air resistance; Acquire a matching external influence parameter set, the matching external influence parameter set including multiple sets of matching external influence parameters, the matching external influence parameters including a friction coefficient matching value between the tire and the road surface and an air resistance matching value; Comprehensively analyze the friction coefficient between the tire and the road surface, the control resistance, the friction coefficient matching value between each tire and the road surface, and the air resistance matching value to obtain the matching value of each influencing error; Obtaining a matching external influence parameter corresponding to the minimum influence error matching value, wherein the influence error value stored in the database corresponding to the matching external influence parameter is the influence error value corresponding to the external influence parameter; The friction coefficient between tire and road The calculation formula is: ； In the formula, is the friction coefficient of dry road surface, k is the road surface correction coefficient; The calculation formula of air resistance F is: ； In the formula, is the air density, is the air resistance coefficient, A is the frontal area of ​​the vehicle, and v is the vehicle speed; The calculation formula for the influence error matching value is: ； In the formula, is the mth influencing error matching value, is the current friction coefficient between the tire and the road, is the friction coefficient matching value between the mth tire and the road surface, is the current air resistance, is the mth control resistance matching value, for The weight factor of for The weight factor of , e is a natural constant, and m is the number of the matching external influencing parameter.

10. The vehicle steering performance testing method according to claim 8, characterized in that: The method of obtaining a performance evaluation result based on the test device parameters, the vehicle initial parameters and the influencing error value specifically includes the following steps: Performance evaluation models include neural network models and support vector machines; Inputting the test device parameters, the vehicle initial parameters and the influencing error value into the neural network model to obtain a first evaluation value; Inputting the test device parameters, the vehicle initial parameters and the influencing error value into the support vector machine model to obtain a second evaluation value; Analyze the first evaluation value and the second evaluation value to obtain a comprehensive evaluation value; The comprehensive evaluation value is compared with the performance evaluation threshold stored in the database. If the comprehensive evaluation value is less than the performance evaluation threshold, the vehicle steering performance is level 2, and the performance evaluation result is abnormal; If the comprehensive evaluation value is not less than the performance evaluation threshold, the vehicle steering performance is level one, and the performance evaluation result is normal; The calculation formula for the comprehensive evaluation value is: ； In the formula, is the comprehensive evaluation value, is the first evaluation value, is the second evaluation value, for The weight factor of for The weight factor of .

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