Automobile steering performance testing device and method

Abstract

The invention belongs to the technical field of steering performance testing, and particularly relates to an automobile steering performance testing device and method.The automobile steering performance testing device comprises a box body, a testing device placed in the box body and used for being connected with a steering wheel to conduct steering performance testing, a detection device arranged in the box body and used for assisting testing and a pushing device arranged in the box body and used for driving the box body to be opened and closed; the testing device comprises a control device, an adjusting piece arranged on one side of the control device, a lower connecting claw arranged below the adjusting piece, curved bar pieces symmetrically arranged on the two sides of the control device, side connecting claws arranged at the ends, away from the control device, of the curved bar pieces, and a steering hand wheel arranged on the side connecting claw on one side. The pushing device comprises pushing rods which are symmetrically arranged on the two sides in the box body and hinged to the box body, sliding blocks hinged to the other ends of the pushing rods and positioning pieces used for positioning the sliding blocks. Buttons on the surface of the steering wheel can be prevented from being shielded, normal use of a vehicle cannot be affected during dynamic testing, and the safety of a driver is improved.

Description

Technical Field

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

[0002] The automobile steering performance test is a process of testing and evaluating the various performance indicators of the automobile steering system, aiming to ensure the safety, reliability and controllability of the automobile steering system. It mainly includes the following test contents: steering lightness test, measuring the force required by the driver to turn the steering wheel, and evaluating whether the power-assisting effect of the steering system is appropriate; steering accuracy test, checking the matching degree between the steering wheel turning angle and the actual steering angle of the wheel; steering stability test, examining whether the steering system can maintain the stable driving of the vehicle during driving; steering return performance test, when the driver completes the steering operation, observe whether the steering system can automatically return the wheel to the straight 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 the driver turning the steering wheel to the wheel starting to turn.

[0003] During the existing steering performance test, the driver is required to install the steering parameter tester horizontally on the steering wheel before the test can be carried out. After installation, the steering parameter tester will block the buttons on the surface of the steering wheel to a certain extent. During dynamic testing, it may affect the normal use of the vehicle, increase the risk of safety accidents, and reduce the safety of the driver. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a vehicle steering performance testing device and method, which can avoid blocking the buttons on the surface of the steering wheel, thereby not affecting the normal use of the vehicle during dynamic testing.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a vehicle steering performance test device, comprising a box, a test device placed in the box for connecting with a steering wheel to perform a steering performance test, a detection device 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 includes a control device, an adjustment member arranged at one side of the control device, a lower connecting claw arranged below the adjustment member, a bent rod member symmetrically arranged at both sides of the control device, a side connecting claw arranged at one end of the bent rod member away from the control device, and a steering hand wheel arranged on one side of the side connecting claw, wherein the adjustment member cooperates with the bent rod member to adjust the distance between the side connecting claws on both sides; 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; 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.

[0006] 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.

[0007] 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.

[0008] 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.

[0009] Preferably, the lower connecting claw is installed at the bottom of the adjustment box, and the lower connecting claw is used to clamp on the side of the steering wheel that is tilted downward, and elastic cards are respectively provided at the top and bottom of the inner side of the lower connecting claw; the side connecting claw is rotatably installed at the end of the second curved rod away from the first curved rod, and the side connecting claw is used to clamp on the side of the steering wheel, and an extrusion block is provided at the bottom of the side connecting claw, and an adjusting screw is installed at the bottom of the extrusion block, and the adjusting screw is threadedly connected to the bottom of the side connecting claw; a convex ball array is provided on the top of the extrusion block, and a convex strip array is provided on the top of the inner side of the side connecting claw.

[0010] Preferably, the box body includes a placement box and a box cover meshingly connected thereto, the placement box is provided with a storage pad for storing the test device, and a detection device for detecting whether the wheel is rotating is installed on the inner side of the box cover; two groups of positioning parts are provided in the placement box on the same side, and they are the starting positioning parts and the end positioning parts, respectively, which are used to position the slider when it is not moved and to position the slider after it is moved, so as to realize the opening and closing of the box cover.

[0011] Preferably, one end of the push rod is hingedly arranged on the inner side of the box cover, and installation grooves compatible with the push rod are respectively opened on the upper side of the two side walls of the placement box, and a sliding groove is connected to the outward side of the installation groove. The sliding groove is opened on the outer side wall of the placement box, and the sliding block passes through the sliding groove from the installation groove and extends to the outside of the placement box; the positioning member includes an insertion rod and a connecting spring, the insertion rod includes a rod portion and a convex plate portion, the convex plate portion is arranged in the middle position of the rod portion and extends to the outside of the placement box, the connecting spring is sleeved on the outside of the rod portion above the convex plate portion, and the lower end of the rod portion below the convex plate portion extends into the sliding block, and a movable groove compatible with the positioning member is opened on the upper inner side of the sliding groove.

[0012] The vehicle steering performance testing method is applied to the above-mentioned vehicle steering performance testing device, comprising the following steps: 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.

[0013] Preferably, obtaining the influence error value specifically includes the following steps: external influence parameters include the friction coefficient between the tire and the road surface and the air resistance; obtaining a matching external influence parameter set, the matching external influence parameter set includes multiple sets of matching external influence parameters, the matching external influence parameters include the friction coefficient matching value between the tire and the road surface and the air resistance matching value; comprehensively analyzing the friction coefficient between the tire and the road surface and the control resistance and the friction coefficient matching value between each tire and the road surface and the air resistance matching value to obtain each influence error matching value; obtaining the matching external influence parameter corresponding to the minimum influence error matching value, the influence error value corresponding to the matching external influence parameter stored in the database 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: ; 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.

[0014] Preferably, based on the test device parameters, the vehicle initial parameters and the influencing error value, the 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; the test device parameters, the vehicle initial parameters and the influencing error value are input into the neural network model to obtain a first evaluation value; the test device parameters, the vehicle initial parameters and the influencing error value are input into the support vector machine model to obtain a second evaluation value; the first evaluation value and the second evaluation value are analyzed 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 1, and the performance evaluation result is normal; the calculation formula of 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 .

[0015] The present invention has the following beneficial effects: The device of the present invention cooperates with the arranged adjusting member, curved rod member, locking member, side connecting claw and lower connecting claw so that the side connecting claw and the lower connecting claw can be fastened on the steering wheel in an inverted triangle shape. After installation, the first curved rod and the second curved rod are adjusted to avoid blocking the buttons on the surface of the steering wheel. Therefore, during dynamic testing, the normal use of the vehicle will not be affected, thereby improving the safety of the driver.

[0016] The device of the present invention is used in conjunction with the arranged adjusting member, the bent rod member and the locking member to adjust the distance between the two side connecting claws according to the diameter of the steering wheel, and after the adjustment, the adjusting block is locked and limited to avoid affecting the subsequent installation effect, and the device has high applicability.

[0017] The device of the present invention is used in conjunction with the testing device, the detection device, the placement box, the box cover, the push rod, the slider and the positioning piece to monitor the vehicle tire from the outside during static testing and assist in testing in a static state. One person can complete the entire test operation, reducing human resources, and according to needs, the placement box can be folded up during dynamic testing, which is flexible to use.

[0018] The device of the present invention is used in conjunction with the arranged adjustment piece, the bent rod piece, the second stud and the second clamping block, and is used to overlap and limit the two second bent rods after the use of the test device is finished, and to clamp them by the second stud and the second clamping block, so that the test device can be moved by hand, which is convenient to carry and move and easy to use.

[0019] The method of the present invention can accurately reflect the steering performance of the vehicle in the actual use environment by introducing the error matching value, so that the test result is closer to the real driving scene, and can adapt to different external environmental conditions, has high flexibility and adaptability, and can reflect the influence of the external environmental change on the vehicle steering performance in real time, which is convenient for subsequent analysis and optimization, avoids the error caused by subjective judgment, and can provide data support for the design and optimization of the vehicle steering system, 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, thereby improving the accuracy and reliability of automobile steering performance evaluation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the device of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the structure from another perspective; Figure 3 It is a structural schematic diagram of the adjustment box and the lower connecting claw of the present invention; Figure 4 It is a structural schematic diagram of the side connecting claw of the present invention; Figure 5 It is a structural schematic diagram of the lower connecting claw of the present invention; Figure 6 It is a schematic diagram of the structure after the first stud and the first pressing block of the present invention are separated; Figure 7 It is a schematic diagram of the structure inside the regulating box of the present invention; Figure 8 It is a schematic diagram of the structure of two overlapping second curved bars of the present invention; Fig. 9 This is a schematic diagram of the structure of the interior of the placement box of the present invention; Fig.10 This is a schematic diagram of the structure of the connection between the slider and the insertion rod of the present invention; Fig.11 It is a structural schematic diagram of the present invention during use; Fig.12 Schematic diagram of the process of the present invention.

[0021] 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

[0022] 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.

[0023] like Figure 1-Figure 11As 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] In this embodiment, the first curved rod 10 and the first stud 13 are an integral structure. When the two side connecting claws 17 are connected to the steering wheel, the two first clamping blocks 14 are screwed upward to release the squeezing of the second curved rod 11, and the lower connecting claw 15 is moved. The first stud 13 slides in the adjustment groove 12, and the inclination angle of the second curved rod 11 changes until the lower connecting claw 15 is engaged with the lower edge of the steering wheel. Observe whether the first curved rod 10 and the second curved rod 11 block the buttons on the surface of the steering wheel. If so, rotate the adjustment block 3 to make the first curved rod 10 rotate outward from 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 surface of the steering wheel. Then, stop rotating. This can avoid blocking the buttons on the surface of the steering wheel and avoid affecting the normal use of the vehicle during the vehicle movement test.

[0030] When the test device is finished using, the first clamping block 14 is screwed upward to release the clamping of the second curved rod 11, and the adjusting block 3 is rotated to make the first curved rod 10 rotate to be in contact with the two sides of the adjusting box 2 away from the control device 1, and the second curved rod 11 is pushed so that the position where the side connecting claw 17 is installed on the second curved rod 11 faces outward, and the first clamping block 14 is screwed down again to clamp 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. The second clamping block 22 is screwed on to clamp the two second curved rods 11 so that they cannot move. The overlapping part of the two second curved rods 11 can be held to move the entire test device by hand and put it back into the storage pad 25 for storage.

[0031] 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. 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 installed at the end of the second curved rod 11 away from the first curved rod 10, and the side connecting claw 17 is used to be clamped on the side of the steering wheel. An extrusion block 18 is provided at the bottom of the side connecting claw 17, and an adjusting screw 19 is installed at the bottom of the extrusion block 18. The adjusting screw 19 is threadedly connected to the bottom of the side connecting claw 17; a convex ball array is provided on the top of the extrusion block 18, and a convex strip array is provided on the top of the inner side of the side connecting claw 17.

[0032] In this embodiment, the elastic card 16 is welded on the inner side of the lower connecting claw 15. When the lower connecting claw 15 is locked on the steering wheel, the steering wheel squeezes the elastic card 16, and the lower connecting claw 15 is fastened to the steering wheel through the upper and lower elastic cards 16. When the side connecting claw 17 is locked on the steering wheel, the adjusting screw 19 is screwed to move the extrusion block 18 upward. Through the convex ball on the extrusion block 18 and the convex strip on the inner side of 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 that the side connecting claw 17 is fastened to the steering wheel for subsequent testing operations.

[0033] The box body includes a placement box 23 and a box cover 24 meshingly connected therewith. A storage pad 25 for storing the test device is arranged in the placement box 23. A detection device 26 for detecting whether the wheel is rotating is installed inside the box cover 24. Two sets of positioning members are arranged in the placement box 23 on the same side, and they are the starting positioning member and the end positioning member, respectively, 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. One end of the push rod 27 is hingedly arranged inside the box cover 24. The upper part of the two side walls of the placement box 23 is respectively provided with mounting members adapted to the push rod 27. The mounting groove 32 has a sliding groove 33 extending outwardly therefrom. The sliding groove 33 is provided on the outer 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 includes an insert rod 29 and a connecting spring 30. The insert 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 outside of the rod portion above the convex plate portion. The lower end of the rod portion below the convex plate portion extends into the sliding block 28. A movable groove 31 matching the positioning member is provided on the upper inner side of the sliding groove 33.

[0034] In this embodiment, when it is necessary to take the test device or open the box cover 24, the insertion rod 29 in the starting point positioning piece is pushed upward, the connecting spring 30 is compressed, the insertion rod 29 at this position moves upward, and the limit on the slider 28 is released. 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 position piece, the insertion rods 29 in the end position pieces on both sides are pushed upward, so that the slider 28 moves to the insertion rod 29 is lowered, the insertion rod 29 is released, and the connecting spring 30 at this position is reset, so that the insertion 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, and the test device can be taken out and installed on the steering wheel. If a static test is 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 turn, the driver is reminded to stop turning the steering wheel, thereby completing 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 or damage.

[0035] Automobile steering performance test method, such as Fig.12 As shown, the method 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 vehicle initial parameters stored in the database, the vehicle initial parameters include vehicle mass, wheelbase, front wheel lateral stiffness, and rear wheel side panel stiffness; based on the external influencing parameters stored in the database, analyzing to obtain an influencing error matching value, and obtaining an influencing error value based on the influencing error matching value.

[0036] External influencing parameters include the friction coefficient between the tire and the road surface and the air resistance; obtaining a matching external influencing parameter set, the matching external influencing parameter set includes multiple groups of matching external influencing parameters, the matching external influencing parameters include the friction coefficient matching value between the tire and the road surface and the air resistance matching value; comprehensively analyzing the friction coefficient between the tire and the road surface and the control resistance and the friction coefficient matching value between each tire and the road surface and the air resistance matching value to obtain each influencing error matching value; obtaining the matching external influencing parameter corresponding to the minimum influencing error matching value, the influencing error value corresponding to the matching external influencing parameter and stored in the database is the influencing error value corresponding to the external influencing parameter.

[0037] The friction coefficient between tire and road The calculation formula is: ; In the formula, is the friction coefficient of dry road surface, and k is the road surface correction coefficient.

[0038] 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.

[0039] The calculation formula for the influence error matching value is: ; In the formula, is the mth influencing error matching value, is the friction coefficient between the current 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.

[0040] Traditional test methods usually assume ideal conditions (such as dry roads and windless environments), but in actual driving environments, road conditions and air resistance will significantly affect the vehicle's steering performance. By introducing external influencing parameters (such as the friction coefficient between the tire and the road, air resistance) and their error matching values, the steering performance of the vehicle in the actual use environment can be accurately reflected. By dynamically adjusting the external influencing parameters, the test results are closer to the real driving scene. The vehicle's steering performance depends not only on the mechanical characteristics of the vehicle itself, but also on the external environment (such as slippery roads and wind speed). The introduction of external environmental factors makes the test results more comprehensive.

[0041] By matching the external impact parameter set, a variety of external environmental conditions can be simulated. It can adapt to different external environmental conditions (such as rainy days, snowy days, and windy days) and dynamically adjust the test parameters. Dynamically calculate the impact error matching value, which can reflect the impact of external environmental changes on the vehicle's steering performance in real time.

[0042] By using clear mathematical models (such as the friction coefficient formula, air resistance formula, and influence error matching value formula) for calculation, the test results are scientific and repeatable, which facilitates subsequent analysis and optimization and avoids errors caused by subjective judgment.

[0043] By adjusting and matching the external influence parameter set, different test scenarios (such as dry roads, wet roads, and icy and snowy roads) can be simulated. It is applicable to a variety of test scenarios, including laboratory tests, actual road tests, extreme environment tests, etc., with 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 steering system.

[0044] The performance evaluation model stored in the database is obtained, and the performance evaluation result is obtained based on the test device parameters, the vehicle initial parameters and the influencing error value; and the performance evaluation result is output to the control device 1.

[0045] The performance evaluation model includes a neural network model and a support vector machine; the test device parameters, the vehicle initial parameters and the influencing error value are input into the neural network model to obtain a first evaluation value; the test device parameters, the vehicle initial parameters and the influencing error value are input into the support vector machine model to obtain a second evaluation value; the first evaluation value and the second evaluation value are analyzed 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 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 level one, and the performance evaluation result is normal.

[0046] The test device parameters, vehicle initial parameters and influencing error values ​​are organized into a model input format, namely, the input vector X, and input into the neural network model to obtain a 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 the 9 input parameters), and the output layer includes 1 node (outputting the first evaluation value).

[0047] The output of the neural network model is: ; In the formula, is the output value of the hidden layer, f and g are activation functions, is the hidden layer weight matrix, is the hidden layer bias vector, is the output layer weight matrix, is the output layer bias vector, is the first evaluation value.

[0048] The input vector X is input into a support vector machine model to obtain a second evaluation value. The support vector machine model includes a kernel function and a radial basis function.

[0049] The output of the support vector machine is: ; In the formula, is the weight of the support vector, is the kernel function, is the eigenvector of the ath 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.

[0050] The calculation formula for the comprehensive evaluation value is: ; In the formula, is the comprehensive evaluation value, for The weight factor of for The weight factor of .

[0051] 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.

[0052] 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.

[0053] 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.

[0054] If a static test is 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. The driver turns the steering wheel through the steering hand wheel 20. When the wheel is about to turn, the driver is reminded to stop turning the steering wheel, thereby completing 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 or 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) meshingly 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 method for testing the steering performance of an automobile 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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