Static mechanical steering characteristic measurement system and use method

Abstract

The invention relates to the technical field of vehicle steering performance testing, in particular to a static mechanical steering characteristic measuring system and a using method. The system comprises a force application support, a force sensor, an independent laser displacement scale, a laser displacement sensor and a data acquisition instrument. The method comprises the steps that a test sample car is parked on a horizontal ground test site, and a steering wheel is located at the middle position; connecting a corresponding structure of the static mechanical steering characteristic measurement system to a corresponding position of the test sample vehicle; a laser displacement sensor and a force sensor of the system are installed and fixed to corresponding positions, and calibration and testing are carried out; supporting and suspending left and right steering wheels of the test sample vehicle, and applying a horizontal acting force to the force sensor; original data measured by the sensor are collected and recorded, and the test is completed. The problems that in the prior art, testing steps are tedious, efficiency is low, force application is difficult, and operation is inconvenient are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle steering performance testing, and in particular to a static mechanical steering characteristic measurement system and a use method thereof. Background Art

[0002] The static mechanical steering characteristic test is an important test in vehicle development and quality control. Its test objectives are mainly the following four points: First, to evaluate the basic performance of the vehicle's steering system when it is stationary, to ensure that the vehicle has good handling stability and safety during driving, and to ensure that the design requirements are met; second, to detect the accuracy and free clearance of the steering system, and to measure the steering wheel idling angle, that is, the steering wheel angle when there is no steering wheel movement, to evaluate the accuracy and free clearance of the steering system, and to ensure the accurate transmission of steering commands; third, to evaluate the rigidity of the steering system, and to detect the deformation of the steering system by applying external force, to ensure that the system can still maintain sufficient rigidity when it is impacted or loaded, and to prevent steering misalignment caused by deformation; fourth, to optimize the design of the steering system. The data obtained through the test provide feedback for the design optimization of the steering system, help engineers improve the structure and performance of the steering system, and adjust the relevant parameters of the steering system according to the test results, such as transmission ratio, power size, stiffness, etc., to improve the overall driving experience.

[0003] The static mechanical steering characteristics test includes:

[0004] Steering ratio test, measuring the ratio between the steering wheel angle and the steering wheel angle to evaluate the transmission efficiency of the steering system;

[0005] Steering free play test, measuring the steering wheel free-swing angle, that is, the intercept of the horizontal coordinate (steering wheel angle) of the curve of the wheel angle corresponding to the steering wheel angle to evaluate the accuracy of the steering system;

[0006] Steering resistance torque test: apply torque to the steering wheel (suspended) in the free state of the steering wheel to obtain the torque-wheel angle history curve. Half of the intercept of the ordinate (wheel torque) when the angle is 0° in the wheel torque and wheel angle history curve is defined as the steering system resistance torque, which is used to evaluate the lightness of steering;

[0007] Steering system rigidity test: When the steering wheel is fixed, torque is applied to the outer steering wheel (the right front wheel is defined as the outer wheel) to obtain the slope of the curve of the relationship between the outer steering wheel torque and the steering wheel angle, that is, the stiffness characteristic, so as to evaluate the deformation degree and rigidity of the steering system when subjected to external force.

[0008] With the development of the automobile industry, the requirements for vehicle steering performance are getting higher and higher. Although the current steering static characteristics test technology is relatively mature, it still has shortcomings such as cumbersome test steps, low efficiency, and reliance on manual operation. In the commercial vehicle steering static characteristics test, in order to measure the steering system resistance and steering system stiffness characteristics, it is necessary to fix the input section steering wheel and apply a uniform push and pull force to the left and right on the vehicle steering wheel. Manpower alone cannot meet the test requirements.

[0009] CN117705473A relates to the field of vehicle steering system testing, and specifically discloses a truck steering system performance evaluation device and method. When the vehicle is conducting an in-situ steering test, the steering wheel torque and the turning angle are used to evaluate whether the steering wheel symmetry meets the requirements, whether the hand force to be applied to the steering wheel meets the requirements, and whether the number of steering circles of the steering wheel meets the requirements; when the vehicle is conducting an 8-shaped road test, the steering system load capacity is evaluated according to the oil inlet pressure and the oil inlet temperature. When the vehicle is conducting a steering speed test, the steering system steering speed capacity is evaluated according to the steering wheel speed and torque. At the same time, the steering performance evaluation index is calculated according to the steering wheel torque, the turning angle, the steering speed, the oil inlet pressure and the oil inlet temperature, and the overall performance of the steering system is evaluated based on the steering performance evaluation index. However, this prior art is a steering system performance test method under the driving state of the vehicle, and cannot be used to implement a static steering characteristic test.

[0010] CN201016866Y discloses a vehicle steering system stiffness test bench, the test bench comprises a base and a fixing bracket arranged on the base; the upper surface of the base is rectangular, and a groove is provided at the end of the base; the groove is a cross groove, a bolt is provided in the groove, and the fixing bracket can be adjusted and fixed along the groove. However, the prior art fixes the steering wheel and cannot be used to apply force to the steering wheel, and the test also requires the wheel to be removed, which is time-consuming and labor-intensive. Summary of the invention

[0011] The object of the present invention is to provide a static mechanical steering characteristic measurement system and a method of use, which can facilitate the application of force to the steering wheel, facilitate the collection and recording of test data, and can also conveniently and stably fix the steering input end, thereby solving the problems of cumbersome test steps, low efficiency, difficulty in applying force and inconvenient operation in the prior art.

[0012] The present invention provides the following solution

[0013] A static mechanical steering characteristic measurement system includes a steering wheel measurement system, wherein the steering wheel measurement system includes:

[0014] A force-applying bracket, used to provide a force arm and transmit torque;

[0015] A force sensor, the force sensor is detachably connected to the end of the force-applying bracket and is used to detect the force acting on the force-applying bracket;

[0016] An independent laser displacement scale, wherein a plurality of fixed marks are provided on the independent laser displacement scale for reflecting laser light;

[0017] Laser displacement sensor, used to emit laser to the laser displacement scale to measure the steering wheel end angle;

[0018] The data acquisition device is used to acquire and record the data detected by the force sensor and the laser displacement sensor.

[0019] The laser displacement scale includes an independent laser displacement scale and an integrated laser displacement scale, and the laser displacement sensor can emit laser light to the independent laser displacement scale or the integrated laser displacement scale respectively.

[0020] Furthermore, the force-applying bracket includes a fixed seat, which is a strip-shaped structure, and the rear surfaces of both ends of the fixed seat are respectively fixedly connected with connecting pieces, and the middle front surface of the fixed seat is vertically fixedly connected with a force rod, and support rods are respectively arranged on the left and right sides of the force rod, and the support rods are obliquely arranged, and the two ends of the support rod are respectively fixedly connected to the force rod and the fixed seat, and the two support rods and the fixed seat together form a triangular structure; the free end of the force rod is fixedly connected with a sensor connecting piece, and the force sensor is detachably connected to the sensor connecting piece.

[0021] Connecting pieces are fixedly connected to the rear surfaces of both ends of the fixing seat, which are used to connect with the spoke bolts on both sides of the vertical symmetry axis of the steering wheel, so as to push the steering wheel to rotate left and right when force is applied. A force rod is vertically fixedly connected to the front surface of the middle part of the fixing seat, so that the center of the force arm is as close as possible to the center of the steering wheel; the support rod is arranged to make the force transmission of the force bracket more uniform and improve the bearing capacity of the force bracket, so as to avoid bending deformation caused by excessive force on the force rod.

[0022] Furthermore, the connecting member is a U-shaped cross-section plate structure, the front end of the connecting member is fixedly connected to the fixing seat, and the rear end of the connecting member is provided with a strip-shaped connecting hole, and the connecting member can be connected to the spoke bolts of the vehicle steering wheel through the strip-shaped connecting hole.

[0023] The strip-shaped connecting holes provided on the connecting piece can adapt to the bolt spacings of different wheel spokes of different vehicle models.

[0024] Furthermore, the force application rod includes an outer rod and an inner rod, the outer rod is fixedly connected to the fixing seat, and the left and right sides of the outer rod are respectively fixedly connected to the two support rods; the inner rod is slidably sleeved inside the outer rod, and the inner rod and the outer rod are respectively provided with connecting locking holes, which can be locked by inserting a locking pin into the locking holes; the free end of the inner rod is fixedly connected to the sensor connector.

[0025] The force rod is a telescopic rod, and the length of the force rod can be adjusted to meet the needs of different models.

[0026] Furthermore, the force-applying bracket also includes an integrated laser displacement scale, and the integrated laser displacement scale is fixedly connected to the upper surface of the fixing seat of the force-applying bracket.

[0027] Integrating the laser displacement scale into the force-applying bracket can eliminate the step of installing an independent laser displacement scale on the right steering wheel, thereby improving work efficiency.

[0028] Furthermore, it also includes a steering wheel fixing mechanism, which includes a fixing rod, and at least three clamp assemblies are slidably sleeved on the fixing rod.

[0029] Since fixing the steering wheel requires at least three fixing points, at least three clamp assemblies are provided on the fixing rod.

[0030] Furthermore, the fixing rod is a tubular structure with a rectangular cross-section; the clamp assembly includes a sleeve portion and a clamping portion, the sleeve portion is a U-shaped portion, the sleeve portion can be slidably sleeved on the outside of the fixing rod, the top surface of the sleeve portion is provided with a fastening bolt, and the bottom end of the fastening bolt can be pressure-contacted with the top surface of the fixing rod; the rear side wall of the sleeve portion is fixedly connected with the clamping portion, and the clamping portion includes two left and right clamping screws that are relatively arranged, and the two clamping screws are respectively fixedly connected to the left and right sides of the rear side wall of the sleeve portion; the free ends of the two clamping screws are jointly limitedly sleeved with a clamping plate, and the clamping screw behind the clamping plate is threadedly sleeved with a fixing nut, and the fixing nut can be limitedly contacted with the clamping plate.

[0031] A fastening bolt is provided on the top surface of the sleeve part. Tightening the fastening bolt can apply pressure to the fixing rod, thereby increasing the friction between the inner wall of the sleeve part and the outer wall of the fixing rod, and fixing the clamp assembly on the fixing rod; the two left and right relatively arranged clamping screws can clamp the outer ring of the steering wheel or the armrest of the cab between the two clamping screws; the free ends of the two clamping screws are jointly limited by a clamping plate, which is used to connect the rear parts of the two clamping screws to form a closed loop, so as to prevent the clamp from falling off from the steering wheel or the armrest of the cab; a fixing nut matching the clamping screw is provided at the rear of the clamping plate, which is used to limit and fix the clamping plate to prevent the clamping plate from falling off.

[0032] A method for using a static mechanical steering characteristic measurement system, based on the above-mentioned static mechanical steering characteristic measurement system, comprises the following steps:

[0033] S1. Park the test vehicle on a horizontal test site with the steering wheel in the middle position;

[0034] S2. Connect the corresponding structure of the static mechanical steering characteristic measurement system to the corresponding position of the test vehicle;

[0035] S3, installing and fixing the laser displacement sensor and force sensor of the system to corresponding positions and calibrating and testing them;

[0036] S4. The left and right steering wheels of the test vehicle are suspended in the air, and a horizontal force is applied to the force sensor;

[0037] S5. Collect and record the original data measured by the sensor to complete the test.

[0038] Furthermore, the step S2 includes the following steps:

[0039] S21, connecting the two connecting pieces of the force-applying bracket to the left and right ends of the right steering wheel spoke respectively;

[0040] S22. Install an independent laser displacement scale on the spoke end face of the left steering wheel.

[0041] The step S3 comprises the following steps:

[0042] S31, a laser displacement sensor is placed at equal heights in front of both ends of the independent laser displacement scale and the integrated laser displacement scale respectively;

[0043] S32, installing the force sensor on the sensor connector of the force-applying bracket;

[0044] S33, electrically connecting the laser displacement sensor and the force sensor to the data acquisition instrument, turning on the power supply to preheat each sensor to a normal operating temperature, and calibrating and testing each sensor;

[0045] The step S4 comprises the following steps:

[0046] S41. Use a jack to support the steering shaft between the left and right steering wheels, and start the engine;

[0047] S42. The reciprocating horizontal pulling and pressing force applied to the force sensor causes the steering wheel to rotate left and right.

[0048] Furthermore, step S2 also includes installing and fixing the clamp assembly of the steering wheel fixing mechanism to the outer rings on the left and right sides of the steering wheel and the cab armrest, and fixing the clamp assembly to the fixing rod to lock the steering wheel.

[0049] Compared with the prior art, the present invention has the following advantages:

[0050] The static mechanical steering characteristic measurement system and use method provided by the present invention are provided with a force-applying bracket, through which a force can be easily applied to the steering wheel; the system is also provided with a force sensor, a laser displacement sensor and a data acquisition instrument, which can facilitate the collection and recording of test data; and a steering wheel fixing mechanism is also provided, which can conveniently and stably fix the steering input end, thereby solving the problems of complicated test steps, low efficiency, difficulty in applying force and inconvenient operation in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0052] Attached Figure 1 It is a structural schematic diagram of the steering wheel measurement system of the present invention;

[0053] Attached Figure 2 It is a structural schematic diagram of the force-applying bracket of the present invention;

[0054] Attached Figure 3 It is a structural schematic diagram of the steering wheel fixing mechanism of the present invention;

[0055] Attached Figure 4 It is a structural schematic diagram of the steering wheel fixing mechanism of the present invention from another angle;

[0056] Attached Figure 5 It is a structural schematic diagram of the clamp assembly of the present invention;

[0057] Attached Figure 6 It is a schematic diagram of the installation position of the steering wheel fixing mechanism of the present invention;

[0058] Attached Figure 7 This is a schematic structural diagram of the force-applying bracket described in Example 3 of the present invention;

[0059] Attached Figure 8 This is a schematic diagram of the method of using the static mechanical steering characteristics measurement system of the present invention.

[0060] In the figure:

[0061] 1-force bracket, 11-fixed seat, 12-connecting piece, 13-force rod, 131-outer rod, 132-inner rod, 14-support rod, 15-sensor connector, 16-integrated laser displacement scale, 2-force sensor, 3-independent laser displacement scale, 4-laser displacement sensor, 5-data acquisition instrument, 6-steering wheel fixing mechanism, 61-fixing rod, 62-clamp assembly, 621-sleeve connection part, 6211-fastening bolt, 622-clamping part, 6221-clamping screw, 6222-clamping plate, 6223-fixing nut. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0063] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0064] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0065] It should be understood that although the terms first, second, third, etc. may be used to describe in the embodiments of the present application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, without departing from the scope of the embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0066] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0067] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0068] It should be particularly noted that any symbols and / or numbers in the specification that are not marked in the accompanying drawings are not drawing marks.

[0069] All aspects of the static mechanical steering characteristic test require the measurement of the steering wheel angle or the steering wheel torque, so the static mechanical steering characteristic measurement system and use method provided in this embodiment are set based on the above two parameters.

[0070] Example 1, please refer to Figure 1 and Figure 6 As shown, this embodiment provides a static mechanical steering characteristic measurement system, including a steering wheel measurement system and a steering wheel fixing mechanism 6; the steering wheel measurement system is used for test personnel to apply tension or pressure to the steering wheel end, and obtain parameters for calculating the steering wheel angle and torque through sensor measurement; the steering wheel fixing mechanism 6 includes a fixing rod 61 and a clamp assembly 62, and the fixing rod 61 can be made of high-strength steel pipe or aluminum alloy profile, and its strength should ensure that there is no obvious deformation under a bending moment of 100N·m; three clamp assemblies 62 are arranged on the fixing rod 61, which are respectively connected to the spokes on both sides of the steering wheel and the handrail of the cab, and the number of clamps can also be increased according to different vehicle models.

[0071] Specifically, see Figure 2 As shown, the steering wheel measurement system includes a force-applying bracket 1, which includes a fixing seat 11. The fixing seat 11 is a strip-shaped groove steel structure, and can also be a steel plate or a steel structure with other cross-sectional forms. Both ends of the fixing seat 11 are connected to the steering wheel through connecting pieces 12 respectively; the connecting piece 12 is a U-shaped cross-sectional plate structure, and its front end is fixedly connected to the fixing seat 11, and the rear end of the connecting piece 12 is provided with a strip-shaped connecting hole, which is connected to the spoke bolt of the steering wheel. Generally, the original wheel locking bolts of the vehicle are used, and the strip-shaped connecting hole is provided to adapt to the bolt spacing of different spokes of different vehicle models.

[0072] A force rod 13 is fixedly connected to the front surface of the middle part of the fixing seat 11. In this embodiment, it is preferably a telescopic rod, and the length of the force rod 13 can be adjusted to meet the needs of different models; the outer rod 131 of the force rod 13 is fixedly connected to the fixing seat 11, and the inner rod 132 of the force rod 13 is slidably sleeved inside the outer rod 131. The inner rod 132 and the outer rod 131 are respectively provided with locking holes, which can be locked by locking pins; support rods 14 are respectively provided on the left and right sides of the outer rod 131. The support rod 14 is obliquely arranged, and its two ends are respectively fixedly connected to the outer rod 131 and the fixing seat 11 to form a triangular structure, so that the force transmission of the force bracket 1 is more uniform and the bearing capacity of the force bracket 1 is improved, so as to avoid the bending deformation caused by excessive force on the force rod 13; the telescopic end of the force rod 13 is fixedly connected to a sensor connector 15, and the sensor connector 15 is detachably connected to a force sensor 2 for detecting the tension or pressure acting on the force bracket 1. In this embodiment, a piezoelectric force sensor produced by Kistler is used.

[0073] The steering wheel measurement system also includes a laser displacement scale and a laser displacement sensor 4. The laser displacement scale includes an independent laser displacement scale 3 and an integrated laser displacement scale 16. The independent laser displacement scale 3 is set separately, and the integrated laser displacement scale 16 is fixedly connected to the upper surface of the fixing seat 11 of the force-applying bracket 1; each laser displacement scale has a number of fixed marks for reflecting laser to measure the wheel-end turning angle; the laser displacement sensor 4 is used to emit laser to the independent laser displacement scale 3 or the integrated laser displacement scale 16 to measure the wheel-end turning angle.

[0074] Specifically, see Figures 3 to 6 As shown, the steering wheel fixing mechanism 6 includes a fixing rod 61. The fixing rod 61 adopts a square steel tube structure, and can also adopt a high-strength material such as aluminum alloy. At least three clamp assemblies 62 can be slidably sleeved on the fixing rod 61. The clamp assembly 62 includes a sleeve connection portion 621 and a clamp connection portion 622. The sleeve connection portion 621 is a square shape and can be slidably sleeved on the outside of the fixing rod 61. The top surface of the sleeve connection portion 621 is provided with a fastening bolt 6211. Tightening the fastening bolt 6211 can apply pressure to the fixing rod 61, thereby increasing the friction between the inner wall of the sleeve connection portion 621 and the outer wall of the fixing rod 61, and fixing the clamp assembly 62 on the fixing rod 61; the rear of the sleeve connection portion 621 The side wall is fixedly connected with a clamping part 622, and the clamping part 622 includes two left and right clamping screws 6221 which are relatively arranged and are respectively fixedly connected to the left and right sides of the rear side wall of the sleeve part 621, so that the outer ring of the steering wheel or the armrest of the cab can be clamped between the two clamping screws 6221; the free ends of the two clamping screws 6221 are jointly limited by a clamping plate 6222, which is used to connect the rear parts of the two clamping screws 6221 to form a closed loop, so as to prevent the clamp assembly 62 from falling off the steering wheel or the armrest of the cab; a fixing nut 6223 matching the clamping screw 6221 is provided at the rear of the clamping plate 6222, which is used to limit and fix the clamping plate 6222.

[0075] See also Figure 8 As shown, this embodiment also provides a method for using a static mechanical steering characteristic measurement system, based on the above-mentioned static mechanical steering characteristic measurement system, comprising the following steps:

[0076] Park the test vehicle on a horizontal test site with the steering wheel in the middle position;

[0077] Connect the corresponding structure of the static mechanical steering characteristic measurement system to the corresponding position of the test vehicle;

[0078] Install and fix the laser displacement sensor 4 and force sensor 2 of the system to the corresponding positions and perform calibration and testing;

[0079] The left and right steering wheels of the test vehicle are suspended in the air, and a horizontal force is applied to the force sensor 2;

[0080] Collect and record the raw data measured by the sensor to complete the experiment.

[0081] Specifically, taking the steering system stiffness characteristic test as an example, the static mechanical steering characteristic measurement system can efficiently and accurately complete the test content:

[0082] First, park the test vehicle on a level test site with the steering wheel in the middle position; refer to Figure 6 As shown, the clamp assembly 62 of the steering wheel fixing mechanism 6 is respectively installed on the outer rings on the left and right sides of the steering wheel and the armrest of the cab to lock the steering wheel;

[0083] Install the force-applying bracket 1 on the spoke end face of the right steering wheel, and use the original connecting bolts between the vehicle's spoke and the brake drum to connect the connecting piece 12 of the force-applying bracket 1 to the left and right ends of the steering wheel spoke;

[0084] An independent laser displacement scale 3 is installed on the spoke end face of the left steering wheel. The independent laser displacement scale 3 can be clamped between the bolts of the spoke or fixed by gluing or other methods. Since the force-applying bracket 1 is provided with an integrated laser displacement scale 16, there is no need to install an independent laser displacement scale 3 on the right steering wheel. A laser displacement sensor 4 is placed in front of both ends of the laser displacement scales of the left and right steering wheels, that is, a total of four laser displacement sensors 4, and the laser displacement sensors 4 are arranged at the same height as the laser displacement scales.

[0085] Install the force sensor 2 onto the sensor connector 15 of the force-applying bracket 1, and electrically connect the laser displacement sensor 4, the force sensor 2, and the charge amplifier and other instruments to the data acquisition instrument 5; turn on the power supply to preheat it to the normal operating temperature, and calibrate and test the sensor;

[0086] Use a jack to support the steering shaft between the left and right steering wheels, so that the left and right steering wheels are about 50 mm off the ground, start the engine, push or pull the force sensor 2 horizontally, and apply a uniform force to the wheels to rotate left and right through the force-applying bracket 1. During the force-applying process, the relative position of the sensor and the force-applying rod 13 remains unchanged, that is, a horizontal reciprocating force of pulling and pressing is applied to the force sensor 2;

[0087] Collect and record 5 to 8 groups of pulling and compressing forces, the change of the front and rear measuring points of the laser displacement scale on the left and right steering wheels, and the distance from the force application point to the kingpin. The steering wheel angle can be calculated based on the change of the front and rear measuring points of the laser displacement scale on the left and right steering wheels. The steering wheel torque can be calculated based on the pulling and compressing forces and the distance from the force application point to the kingpin. Therefore, the original measured data can be used as parameters to calculate the steering system stiffness result. At this point, all the test content is completed.

[0088] Embodiment 2: In the static mechanical steering characteristic test other than the stiffness characteristic test, there is no need to lock the steering wheel. Therefore, this embodiment provides a static mechanical steering characteristic measurement system. Compared with Embodiment 1, the steering wheel fixing mechanism 6 is reduced, and only the steering wheel measurement system is retained.

[0089] Similarly, in other static mechanical steering characteristic tests except the stiffness characteristic test, the system collects the pulling and compressive forces, the changes in the front and rear measuring points of the laser displacement scale on the left and right steering wheels, and the distance from the force application point to the kingpin, which can be used as parameters to calculate other static mechanical steering characteristic measurement results.

[0090] Example 3, please refer to Figure 7 As shown, this embodiment provides a static mechanical steering characteristic measurement system, which simplifies the structure of the force-applying bracket 1 on the basis of Embodiment 1 or 2.

[0091] Specifically, the integrated laser displacement scale 16 on the fixing seat 11 of the force-applying bracket 1 is cancelled and replaced by an independent laser displacement scale 3; the installation and use method thereof is the same as that of the independent laser displacement scale 3 installed on the left steering wheel.

[0092] The force rod 13 of the force bracket 1 is a non-retractable fixed rod 61, and the fixed end of the force rod 13 is fixedly connected to the fixed seat 11. Support rods 14 are respectively provided on the left and right sides of the force rod 13. The support rods 14 are obliquely arranged, and their two ends are respectively fixedly connected to the force rod 13 and the fixed seat 11 to form a triangular structure; the free end of the force rod 13 is fixedly connected to the sensor connector 15, and the sensor connector 15 is detachably connected to the force sensor 2.

[0093] The static mechanical steering characteristic measurement system provided in this embodiment has a simpler structure and reduces processing costs.

[0094] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A static mechanical steering characteristics measurement system, characterized in that: A steering wheel measurement system is included, wherein the steering wheel measurement system includes: A force-applying bracket (1), used for providing a force arm and transmitting torque; A force sensor (2), the force sensor (2) being detachably connected to an end of the force-applying bracket (1) and being used to detect a force acting on the force-applying bracket (1); An independent laser displacement scale (3), wherein a plurality of fixed marks are arranged on the independent laser displacement scale (3) for reflecting laser light; A laser displacement sensor (4) is used to emit laser light to a laser displacement scale to measure the steering wheel end angle; A data acquisition device (5) is electrically connected to the force sensor (2) and the laser displacement sensor (4) and is used to acquire and record data detected by the force sensor (2) and the laser displacement sensor (4).

2. The static mechanical steering characteristic measurement system according to claim 1, characterized in that: The force-applying bracket (1) comprises a fixing seat (11), the fixing seat (11) is a strip-shaped structure, the rear surfaces of both ends of the fixing seat (11) are respectively fixedly connected with connecting pieces (12), the front surface of the middle part of the fixing seat (11) is vertically fixedly connected with a force-applying rod (13), the left and right sides of the force-applying rod (13) are respectively provided with support rods (14), the support rods (14) are obliquely arranged, the two ends of the support rod (14) are respectively fixedly connected with the force-applying rod (13) and the fixing seat (11), and the two support rods (14) and the fixing seat (11) together form a triangular structure; the free end of the force-applying rod (13) is fixedly connected with a sensor connecting piece (15), and the force sensor (2) is detachably connected to the sensor connecting piece (15).

3. The static mechanical steering characteristic measurement system according to claim 2, characterized in that: The connecting member (12) is a U-shaped cross-section plate structure, the front end of the connecting member (12) is fixedly connected to the fixing seat (11), and the rear end of the connecting member (12) is provided with a strip-shaped connecting hole, and the connecting member (12) can be connected to the wheel spoke bolt of the vehicle steering wheel through the strip-shaped connecting hole.

4. The static mechanical steering characteristic measurement system according to claim 2, characterized in that: The force application rod (13) comprises an outer rod (131) and an inner rod (132); the outer rod (131) is fixedly connected to the fixing seat (11); the left and right sides of the outer rod (131) are respectively fixedly connected to the two support rods (14); the inner rod (132) is slidably sleeved inside the outer rod (131); the inner rod (132) and the outer rod (131) are respectively provided with communicating locking holes, which can be locked by inserting a locking pin into the locking holes; the free end of the inner rod (132) is fixedly connected to the sensor connector (15).

5. The static mechanical steering characteristic measurement system according to claim 2, characterized in that: The force-applying bracket (1) further comprises an integrated laser displacement scale (16), wherein the integrated laser displacement scale (16) is fixedly connected to the upper surface of the fixing seat (11) of the force-applying bracket (1).

6. The static mechanical steering characteristic measurement system according to any one of claims 1 to 5, characterized in that: It also comprises a steering wheel fixing mechanism (6), wherein the steering wheel fixing mechanism (6) comprises a fixing rod (61), and at least three clamp assemblies (62) are slidably sleeved on the fixing rod (61).

7. The static mechanical steering characteristic measurement system according to claim 6, characterized in that: The fixing rod (61) is a tubular structure with a rectangular cross section; the clamp assembly (62) comprises a sleeve portion (621) and a clamping portion (622); the sleeve portion (621) is in a square shape, and the sleeve portion (621) can be slidably sleeved on the outside of the fixing rod (61); a fastening bolt (6211) is provided on the top surface of the sleeve portion (621); the bottom end of the fastening bolt (6211) can be in contact with the top surface of the fixing rod (61) by pressure; the rear side wall of the sleeve portion (621) is fixedly connected with the clamping portion (622) The clamping part (622) includes two left and right clamping screws (6221) that are arranged opposite to each other. The two clamping screws (6221) are respectively fixedly connected to the left and right sides of the rear side wall of the sleeve part (621); the free ends of the two clamping screws (6221) are jointly limitedly sleeved with a clamping plate (6222), and a fixing nut (6223) is threadedly sleeved on the clamping screw (6221) behind the clamping plate (6222), and the fixing nut (6223) can be limitedly contacted with the clamping plate (6222).

8. A method for using a static mechanical steering characteristic measurement system, characterized in that: The static mechanical steering characteristic measurement system according to claim 7 comprises the following steps: S1. Park the test vehicle on a horizontal test site with the steering wheel in the middle position; S2. Connect the corresponding structure of the static mechanical steering characteristic measurement system to the corresponding position of the test vehicle; S3, installing and fixing the laser displacement sensor (4) and the force sensor (2) of the system to corresponding positions and performing calibration and testing; S4, the left and right steering wheels of the test vehicle are suspended in the air, and a horizontal force is applied to the force sensor (2); S5. Collect and record the original data measured by the sensor to complete the test.

9. The method for using the static mechanical steering characteristics measurement system according to claim 8, characterized in that: The step S2 comprises the following steps: S21, respectively connecting the two connecting pieces (12) of the force-applying bracket (1) to the left and right ends of the right steering wheel spoke; S22. Install an independent laser displacement scale (3) on the spoke end surface of the left steering wheel. The step S3 comprises the following steps: S31, a laser displacement sensor (4) is respectively placed at the same height in front of both ends of the independent laser displacement scale (3) and the integrated laser displacement scale (16); S32, installing the force sensor (2) onto the sensor connector (15) of the force-applying bracket (1); S33, electrically connecting the laser displacement sensor (4) and the force sensor (2) to the data acquisition device (5), turning on the power supply to preheat each sensor to a normal operating temperature, and calibrating and testing each sensor; The step S4 comprises the following steps: S41. Use a jack to support the steering shaft between the left and right steering wheels, and start the engine; S42, the reciprocating horizontal pulling and pressing force applied to the force sensor (2) causes the steering wheel to rotate left and right.

10. The method for using the static mechanical steering characteristics measurement system according to claim 8, characterized in that: The step S2 further comprises installing and fixing the clamp assembly (62) of the steering wheel fixing mechanism (6) to the outer rings on the left and right sides of the steering wheel and the cab armrest respectively, and fixing the clamp assembly (62) to the fixing rod (61), thereby locking the steering wheel.

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