System for measuring and analyzing relation between wheel turning angle and steering wheel turning angle of commercial vehicle

Abstract

The invention relates to the technical field of automobile testing, in particular to a commercial automobile wheel rotation angle and steering wheel rotation angle relation measurement and analysis system which comprises a target mechanism, a claw-shaped adjusting mechanism is arranged on the inner side of the target mechanism, and a distance measurement installation mechanism is installed on the outer side of the claw-shaped adjusting mechanism. The distance measuring mounting mechanism comprises a servo motor mounting platform, a servo motor body is mounted at the bottom of the servo motor mounting platform, a measuring shaft is mounted at the output end of the servo motor mounting platform, and a fixed clamping seat is mounted on the surface of the measuring shaft. Due to limitation of measurement space and existing measurement means, the overall motion relation of the steering system is difficult to accurately measure, a self-made tool, displacement, a servo motor and other sensors are used for accurately measuring the wheel rotation angle, the torque output by a force measurement steering wheel and rotation angle data are combined, and therefore the overall motion state of the steering system is accurately described; the problem that measurement is difficult is solved.

Description

Technical Field

[0001] This invention relates to the field of automotive testing technology, specifically to a measurement and analysis system for the relationship between wheel angle and steering wheel angle in commercial vehicles. Background Technology

[0002] Automotive testing is a process of systematically testing and verifying automobiles and their components, aiming to verify their performance, reliability, and environmental adaptability. Steering system testing is a key step in evaluating the performance of automotive steering systems, comprehensively testing the handling, safety, and durability of steering systems by simulating real-world driving scenarios.

[0003] Steering system free play, center zone response, wheel angle and steering wheel angle, and steering force relationship are important factors in evaluating the handling performance of a vehicle's steering system and are directly related to the user experience. The accuracy of their measurement is the foundation for a correct evaluation of the steering system. Currently, whether it is a four-wheel alignment system or a force-measuring steering wheel, testing equipment can only evaluate the performance of the vehicle's steering wheels or steering wheel individually. It cannot measure and analyze the kinematic relationship between the two. Therefore, how to simply, efficiently, and conveniently measure the steering system free play, wheel angle and steering wheel angle, and steering force relationship has become an urgent problem to be solved in this industry. In order to solve the above technical problems, we have designed a measurement and analysis system for the relationship between wheel angle and steering wheel angle of commercial vehicles. Summary of the Invention

[0004] The purpose of this invention is to provide a measurement and analysis system for the relationship between wheel angle and steering wheel angle of commercial vehicles. It has the advantages of easy disassembly and assembly, small size and portability. It can easily realize the measurement of the relationship between wheel angle and steering wheel angle of automobiles. It solves the problems that it is difficult to accurately measure the overall motion relationship of the steering system due to the limitations of measurement space and existing measurement methods, and that it is difficult to accurately describe the overall motion state of the steering system. It is also large in size and inconvenient to carry.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a measurement and analysis system for the relationship between wheel angle and steering wheel angle of a commercial vehicle, comprising a target mechanism, a claw-shaped adjustment mechanism disposed on the inner side of the target mechanism, a distance measuring mounting mechanism mounted on the outer side of the claw-shaped adjustment mechanism, the distance measuring mounting mechanism comprising a servo motor mounting platform, a servo motor body mounted on the bottom of the servo motor mounting platform, a measuring shaft mounted on the output end of the servo motor mounting platform, a fixed bracket mounted on the surface of the measuring shaft, a laser rangefinder mounted on the top of the fixed bracket, the claw-shaped adjustment mechanism comprising a locking arm, a pawl mounted on the inner side of the locking arm, a worm gear mounted inside the locking arm, a worm gear mounted on the front side of the outer side of the locking arm, and a first knob and a second knob mounted on the rear side of the outer side of the locking arm.

[0006] Preferably, the target mechanism includes a support frame, on the top and sides of the outer surface of the support frame, a fixed pulley and a lifting adjustment device are respectively movably mounted, the surface of the lifting adjustment device is wound with a rope, and the outer side of the rope passes through the fixed pulley and is fixedly connected to a marker plate.

[0007] Preferably, a force-measuring steering wheel is provided on the inner side of the claw-shaped adjustment mechanism, and the output end of the force-measuring steering wheel is electrically connected to a data acquisition instrument.

[0008] Preferably, the worm and the worm wheel are meshed together, a rotating plate is installed on the top of the worm, and an adjusting spring is installed on the inner side of the second knob.

[0009] A method for sensor installation, adjustment, and positioning in a commercial vehicle wheel angle and steering wheel angle measurement and analysis system:

[0010] A: The claw-shaped adjustment mechanism is installed on the outer or inner edge of the steering wheel rim to ensure that it is parallel to the wheel plane. Through two orthogonal adjustment knobs, it works with the laser rangefinder installed on the measuring axis to measure the distance to the rear marker plate and adjust the axis of the measuring axis to coincide with the extension line of the perpendicular line between the wheel center and the wheel plane.

[0011] B: The mounting platform is used to fix the servo motor body and the laser rangefinder. At the same time, the mounting platform passes through the center scale line to ensure that the laser rangefinder is parallel to the measuring axis and the wheel center extension line in the Z direction.

[0012] C: After the coaxiality adjustment is completed, maintain this state and place the signboard on the side of the vehicle with the wheel being tested. Use a laser rangefinder to measure the distance between the vehicle frame and the signboard at different positions to make the distance at different positions consistent, thereby ensuring that the signboard is parallel to the vehicle's X-axis and automatically perpendicular to the horizontal plane due to gravity.

[0013] D: The servo motor body is fixed to the mounting platform, and the output shaft is equipped with a laser rangefinder. The servo motor body drives the laser rangefinder to rotate, and the servo motor body is used to measure angles.

[0014] E: The signboard is suspended from the bracket by a rope and automatically becomes perpendicular to the horizontal plane due to gravity.

[0015] A measurement method for a commercial vehicle wheel angle and steering wheel angle measurement and analysis system:

[0016] A: After the sensor is installed, adjusted and positioned, record the distance L1 measured by the laser rangefinder. At this time, the wheel rotation angle is 0°, recorded as K0. Drive the servo motor body to drive the laser rangefinder to rotate. When the distance to the side marker is the smallest, record the rotation angle K1 of the servo motor body. Then the wheel toe-in angle K1 between the wheel and the X-axis can be obtained.

[0017] B: Rotate the force measuring steering wheel at a certain angle, record the distance Li measured by the laser rangefinder, drive the servo motor body, and when the distance measured by the laser rangefinder is the smallest, record the rotation angle Ki of the servo motor.

[0018] C: The difference between Ki and K1 is the current wheel angle, and the angle and torque of the force-measuring steering wheel are recorded at the same time;

[0019] D: Based on the test requirements or test objectives, repeat test steps B-C to obtain the relationship between the front wheel angle, the force-measuring steering wheel angle, and the torque.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. Due to limitations in measurement space and existing measurement methods, it is difficult to accurately measure the overall motion relationship of the steering system. This invention utilizes self-made tooling and sensors such as displacement and servo motors to accurately measure the wheel rotation angle. Combined with the torque and rotation angle data output by the force-measuring steering wheel, it can accurately describe the overall motion state of the steering system and solve the problem of its difficulty in measurement.

[0022] 2. The portable tooling mechanism can meet the measurement needs of the whole vehicle in the field.

[0023] 3. The entire measurement system has the advantages of low cost, simple operation, and relatively accurate measurement. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the installation of the measurement system of the present invention in a complete vehicle state;

[0025] Figure 2 This is an isometric view of the coaxiality adjustment device of the present invention;

[0026] Figure 3 This is an axonometric view of the target mechanism of the present invention;

[0027] Figure 4 This is a schematic diagram showing the installation position of the laser rangefinder and servo motor of the present invention;

[0028] Figure 5 This is a schematic diagram of the coaxiality adjustment of the present invention;

[0029] Figure 6 The positional relationship between the target mechanism and the wheel in this invention;

[0030] Figure 7 This is a schematic diagram of the installation of a partial structure of the present invention;

[0031] Figure 8 This is an overall connection diagram of the device of the present invention;

[0032] Figure 9 This is a schematic diagram of the wheel rotation angle measurement of the present invention;

[0033] Figure 10 This is a schematic diagram of the positioning extension line of the present invention.

[0034] In the diagram: 1. Target mechanism; 2. Mounting mechanism; 3. Claw-shaped adjustment mechanism; 4. Force measuring steering wheel; 5. Data acquisition instrument; 6. Worm gear; 7. Worm wheel; 8. Adjusting spring; 9. First knob; 10. Measuring axis; 11. Servo motor mounting platform; 12. Second knob; 13. Locking arm; 14. Claw; 15. Bracket; 16. Marking plate; 17. Rope winding; 18. Fixed pulley; 19. Lifting adjustment device; 20. Fixed bracket; 21. Laser rangefinder; 22. Servo motor body. Detailed Implementation

[0035] Please see Figures 1-10 A measurement and analysis system for the relationship between wheel angle and steering wheel angle of a commercial vehicle includes a target mechanism 1, a claw-shaped adjustment mechanism 3 on the inner side of the target mechanism 1, a distance measuring installation mechanism 2 on the outer side of the claw-shaped adjustment mechanism 3, a servo motor mounting platform 11, a servo motor body 22 on the bottom of the servo motor mounting platform 11, a measuring shaft 10 on the output end of the servo motor mounting platform 11, a fixed bracket 20 on the surface of the measuring shaft 10, a laser rangefinder 21 on the top of the fixed bracket 20, a locking arm 13, a claw 14 on the inner side of the locking arm 13, a worm gear 7 inside the locking arm 13, a worm 6 on the front side of the outer side of the locking arm 13, and a first knob 9 and a second knob 12 on the rear side of the outer side of the locking arm 13.

[0036] Please see Figure 1 The target mechanism 1 includes a bracket 15. The top and sides of the outer surface of the bracket 15 are respectively movably mounted with a fixed pulley 18 and a lifting adjustment device 19. The surface of the lifting adjustment device 19 is wound with a rope 17. The outer side of the rope 17 passes through the fixed pulley 18 and is fixedly connected to a marker plate 16.

[0037] Please see Figure 1 The claw-shaped adjustment mechanism 3 has a force measuring steering wheel 4 installed on its inner side, and the output end of the force measuring steering wheel 4 is electrically connected to a data acquisition instrument 5.

[0038] Please see Figure 1 The worm 6 and the worm wheel 7 are meshed together. A rotating plate is installed on the top of the worm 6, and an adjusting spring 8 is installed on the inner side of the second knob 12.

[0039] A method for sensor installation, adjustment and positioning in a measurement and analysis system for the relationship between wheel angle and steering wheel angle in commercial vehicles.

[0040] A: The claw-shaped adjustment mechanism 3 is installed on the outer or inner edge of the steering wheel rim to ensure that it is parallel to the wheel plane. Through two orthogonal adjustment knobs, it cooperates with the laser rangefinder 21 installed on the measuring shaft 10 to adjust the axis of the measuring shaft 10 to coincide with the extension line of the wheel center and the perpendicular line of the wheel plane by measuring the distance of the rear marker plate 16.

[0041] B: The mounting platform is used to fix the servo motor body 22 and the laser rangefinder 21. At the same time, the mounting platform passes through the center scale line to ensure that the laser rangefinder 21 is parallel to the measuring axis 10 and the wheel center extension line in the Z direction.

[0042] C: After the coaxiality adjustment is completed, maintain this state, and place the sign plate 16 on the side of the vehicle with the wheel being tested. Use the laser rangefinder 21 to measure the distance between the frame and the sign plate 16 at different positions to make the distance at different positions consistent, thereby ensuring that the sign plate 16 is parallel to the vehicle's X-axis and automatically perpendicular to the horizontal plane due to gravity.

[0043] D: The servo motor body 22 is fastened to the mounting platform, and the laser rangefinder 21 is mounted on the output shaft. The laser rangefinder 21 is driven to rotate by the servo motor body 22, and the servo motor body 22 is used to measure the angle.

[0044] E: The signboard 16 is suspended on the bracket 15 by the rope 17, and automatically becomes perpendicular to the horizontal plane due to gravity.

[0045] A measurement and testing method for a commercial vehicle wheel angle and steering wheel angle relationship measurement and analysis system includes the following steps:

[0046] (1) Vehicle preparation

[0047] (1.1) The vehicle shall be adjusted in accordance with the overall vehicle technical specifications and GB12534 to meet the test requirements;

[0048] (1.2) Loading shall be carried out in accordance with the test requirements, and the total mass and axle load shall meet the technical requirements;

[0049] (2) Coaxiality adjustment

[0050] (2.1) Installation of the test apparatus

[0051] 1) Inspect the steering wheels and clean the surface of the wheel rims being tested;

[0052] 2) Adjust the claw-shaped adjustment mechanism 3 to install the coaxiality adjustment device on the wheel rim;

[0053] 3) Mount the laser rangefinder 21 onto the measuring axis 10;

[0054] 4) Place the target mechanism 1 in front of or behind the wheel being tested;

[0055] (2.2) Coaxiality adjustment

[0056] 1) Rotate the wheel and use the laser rangefinder 21 to obtain the minimum horizontal distance between the measuring axle 10 and the signboard 16;

[0057] 2) Rotate the wheel 180°, and the laser rangefinder 21 will again obtain the minimum horizontal distance between the measuring shaft 10 and the signboard 16;

[0058] 3) Adjust the first knob 9 to make the two distances the same (the distance is the average of the two measurements);

[0059] 4) Adjust the second knob 12 in the same way to make the distance between the wheels in the other direction consistent in both cases;

[0060] (3) Measurement of the relationship between wheel angle and steering wheel angle

[0061] (3.1) Installation of the test apparatus

[0062] 1) Maintain the coaxiality measuring equipment in good working order;

[0063] 2) Place the signboard 16 on the side of the vehicle with the wheel being tested, and use the laser rangefinder 21 to measure the distance between the signboard 16 and different positions of the vehicle frame, ensuring that the signboard 16 is parallel to the X-axis of the vehicle;

[0064] 3) Secure the servo motor body 22 to the laser rangefinder 21 via the servo motor mounting platform 11;

[0065] (4) Equipment connection

[0066] Connect the laser rangefinder 21, the servo motor body 22, and the force measuring steering wheel 4 to the corresponding channels of the data acquisition device 5, and at the same time connect the data acquisition device 5 to the laptop computer;

[0067] (5) Measurement preparation

[0068] (5.1) Configure the appropriate sensors and set parameters such as channel sensitivity coefficient, bias, and sampling frequency according to the channel requirements;

[0069] (5.2) Sensor zeroing;

[0070] (6) Conduct the experiment

[0071] (6.1) Record the distance L1 between the laser rangefinder 21 and the signboard 16. At this time, the wheel rotation angle is 0°, which is recorded as K0. Drive the servo motor body 22. When the laser rangefinder 21 measures the minimum distance between the laser rangefinder 21 and the signboard 16, record the rotation angle of the servo motor body 22. The wheel toe-in angle K1 between the wheel and the X-axis can be obtained.

[0072] (6.2) Rotate the force measuring steering wheel 4 at a certain angle, record the distance L2 measured by the laser rangefinder 21 to the signboard 16, drive the servo motor body 22, and when the laser rangefinder 21 measures the minimum distance to the signboard 16, record the rotation angle K2 of the servo motor body 22.

[0073] (6.3) The difference between K2 and K1 is the current wheel angle;

[0074] (6.4) According to the test requirements or test objectives, repeat test 6.2-6.2 to obtain the relationship between the front wheel angle, steering wheel angle and torque.

[0075] In summary, this commercial vehicle wheel angle and steering wheel angle measurement and analysis system, through the coordinated use of the target mechanism 1, mounting mechanism 2, claw-shaped adjustment mechanism 3, force-measuring steering wheel 4, measuring shaft 10, servo motor mounting platform 11, laser rangefinder 21, and servo motor body 22, solves the problems of difficulty in accurately measuring the overall motion relationship of the steering system due to limitations in measurement space and existing measurement methods, the inability to accurately describe the overall motion state of the steering system, and the large size and inconvenience of carrying it.

Claims

1. A measurement and analysis system for the relationship between wheel angle and steering wheel angle of a commercial vehicle, comprising a target mechanism (1), characterized in that: The inner side of the target mechanism (1) is provided with a claw-shaped adjustment mechanism (3), and the outer side of the claw-shaped adjustment mechanism (3) is provided with a ranging installation mechanism (2). The ranging installation mechanism (2) includes a servo motor mounting platform (11), the bottom of the servo motor mounting platform (11) is provided with a servo motor body (22), the output end of the servo motor mounting platform (11) is provided with a measuring shaft (10), the surface of the measuring shaft (10) is provided with a fixed bracket (20), the top of the fixed bracket (20) is provided with a laser rangefinder (21), the claw-shaped adjustment mechanism (3) includes a locking arm (13), the inner side of the locking arm (13) is provided with a pawl (14), the inside of the locking arm (13) is provided with a worm gear (7), the front side of the outer side of the locking arm (13) is provided with a worm (6), and the rear side of the outer side of the locking arm (13) is provided with a first knob (9) and a second knob (12).

2. The measurement and analysis system for the relationship between wheel angle and steering wheel angle of a commercial vehicle according to claim 1, characterized in that: The target mechanism (1) includes a bracket (15). A fixed pulley (18) and a lifting adjustment device (19) are movably installed on the top and side of the outer surface of the bracket (15). A spiral rope (17) is wound around the surface of the lifting adjustment device (19). The outer side of the spiral rope (17) passes through the fixed pulley (18) and is fixedly connected to a marker plate (16).

3. The measurement and analysis system for the relationship between wheel angle and steering wheel angle of a commercial vehicle according to claim 1, characterized in that: The claw-shaped adjustment mechanism (3) is provided with a force measuring steering wheel (4) on its inner side, and the output end of the force measuring steering wheel (4) is electrically connected to a data acquisition instrument (5).

4. The measurement and analysis system for the relationship between wheel angle and steering wheel angle of a commercial vehicle according to claim 1, characterized in that: The worm (6) and worm wheel (7) are meshed together. A rotating plate is installed on the top of the worm (6), and an adjusting spring (8) is installed on the inner side of the second knob (12).

5. A sensor installation, adjustment, and positioning method for a commercial vehicle wheel angle and steering wheel angle relationship measurement and analysis system according to claims 1-4: A: The claw-shaped adjustment mechanism (3) is installed on the outer edge (or inner edge) of the steering wheel rim to ensure that it is parallel to the wheel plane. Through two orthogonal adjustment knobs, it cooperates with the laser rangefinder (21) installed on the measuring shaft (10) to adjust the axis of the measuring shaft (10) to coincide with the extension line of the wheel center and the perpendicular line of the wheel plane by measuring the distance of the rear sign plate (16). B: The mounting platform is used to fix the servo motor body (22) and the laser rangefinder (21). At the same time, the mounting platform passes through the center scale line to ensure that the laser rangefinder (21) is parallel to the measuring axis (10) and the wheel center extension line in the Z direction. C: After the coaxiality adjustment is completed, maintain this state and place the signboard (16) on the side of the vehicle being tested. Use the laser rangefinder (21) to measure the distance between the frame and the signboard (16) at different positions so that the distances at different positions are consistent, thereby ensuring that the signboard (16) is parallel to the vehicle's X-axis and automatically perpendicular to the horizontal plane due to gravity. D: The servo motor body (22) is fastened to the mounting platform, and the laser rangefinder (21) is mounted on the output shaft. The laser rangefinder (21) is driven to rotate by the servo motor body (22), and the servo motor body (22) is used to measure the angle. E: The signboard (16) is suspended on the bracket (15) by the rope (17), and automatically becomes perpendicular to the horizontal plane due to gravity.

6. The measurement method of the commercial vehicle wheel angle and steering wheel angle measurement and analysis system according to claims 1-4: A: After the sensor is installed, adjusted and positioned, record the distance L1 measured by the laser rangefinder (21). At this time, the wheel rotation angle is 0°, recorded as K0. Drive the servo motor body (22) to drive the laser rangefinder (21) to rotate. When the distance to the side signboard (16) is the smallest, record the rotation angle K1 of the servo motor body (22). The wheel toe-in angle K1 between the wheel and the X-axis can be obtained. B: Rotate the force measuring steering wheel (4) by a certain angle, record the distance Li measured by the laser rangefinder (21), drive the servo motor body (22), and when the distance measured by the laser rangefinder (21) is the smallest, record the rotation angle Ki of the servo motor. C: The difference between Ki and K1 is the current wheel angle, and the angle and torque of the force measuring steering wheel (4) are recorded at the same time; D: According to the test requirements or test purpose, repeat test steps B-C to obtain the relationship between the front wheel angle, the force measuring steering wheel (4) angle and the torque.

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