Suspension stiffness measurement device and method

Abstract

The present invention discloses a suspension stiffness measuring device, comprising a measuring platform, a laser height measuring instrument, a single-wheel axle load measuring instrument installed on the measuring platform, a vehicle body clamp, a vehicle lift and a vehicle fixture; when a vehicle enters the measuring platform, the vehicle fixture is located on both sides of the wheel, and is used to fix the tire on the single-wheel axle load measuring instrument, and the single-wheel axle load measuring instrument is used to detect force value change signals during suspension compression and suspension extension; the vehicle lift is used to lift the vehicle, and a pressure sensor is installed on the vehicle lift to collect force value change signals generated during the lifting process; the height of the vehicle above the ground changes during the lifting process, which is collected by the laser height measuring instrument; the suspension stiffness measuring device and the measuring method mentioned in the present invention can not only solve the problem of large suspension stiffness measurement error, but also measure related suspension hysteresis force, providing an accurate reference for subsequent design, development and adjustment work.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle testing, and in particular to a suspension stiffness measuring device and method. Background Art

[0002] The suspension system is a critical component in automotive engineering. It not only determines the vehicle's handling performance and ride comfort, but also directly affects the vehicle's safety and driving stability. The core function of the suspension system is to connect the vehicle body and wheels, and to ensure that the vehicle can maintain a good driving state under various road conditions by effectively absorbing and reducing the impact caused by uneven road surfaces.

[0003] The suspension system is mainly composed of springs, shock absorbers, stabilizer bars, control arms and bushings, and each component works together to ensure the vehicle's handling stability and ride comfort. In the suspension system, the main parameters that affect handling performance and ride comfort are suspension stiffness and suspension hysteresis.

[0004] Suspension stiffness refers to the ability of the suspension system to resist deformation, which is specifically reflected in the stiffness of the spring. The higher the spring stiffness, the smaller the compression or extension deformation of the spring under the same force.

[0005] Suspension hysteresis refers to the difference in damping force generated by the nonlinear characteristics of the internal components (such as shock absorbers, bushings, etc.) of the suspension system during compression and rebound. Specifically, when the suspension is compressed by the impact of the road, and then rebounds under the action of the spring, the shock absorbers, bushings and other components will show different damping effects due to factors such as elastic deformation of the material, oil flow resistance, friction, etc. This difference in damping force in the two directions of compression and rebound is the suspension hysteresis.

[0006] Under conventional testing methods, the vehicle's axle load must first be changed from empty to half-loaded and then fully loaded through standard loading. As the axle load changes, the Z-axis height change of a reference point on the vehicle must be measured specifically, and finally the suspension stiffness is calculated using the corresponding changes in axle load and displacement. However, suspension hysteresis cannot be measured using conventional testing methods. This type of test method is not only slow, but also has large measurement errors, so the measured suspension stiffness can only be used as a reference, and cannot accurately derive such changes. Summary of the invention

[0007] The object of the present invention is to provide a suspension stiffness measuring device to solve the problems raised in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions: a suspension stiffness measuring device, comprising a measuring platform, a laser height measuring instrument, a single wheel axle load measuring instrument installed on the measuring platform, a vehicle body clamp, a vehicle lift and a vehicle fixture;

[0009] When the vehicle enters the measuring platform, the vehicle fixtures are located on both sides of the wheels, which are used to fix the tires on the single-wheel axle load measuring instrument. The bottom of the single-wheel axle load measuring instrument is fixedly connected with a push rod mechanism, which uses a compression module motor to provide a power source. The single-wheel axle load measuring instrument is used to detect the force value change signal during the suspension compression process and the suspension extension process;

[0010] The body clamp is used to fix the longitudinal beams of the vehicle body;

[0011] The vehicle lift is used to lift the vehicle. A pressure sensor is installed on the vehicle lift to collect force value change signals generated during the lifting process.

[0012] The laser height measuring instrument is installed on the vehicle. During the lifting process, the height of the vehicle above the ground changes, which is captured by the laser height measuring instrument.

[0013] It also includes a device controller, which receives measurement data from the single-wheel axle load measuring instrument, the pressure sensor and the laser height measuring instrument.

[0014] Preferably, the laser height measuring instrument is fixed on the adsorber, which is fixed to the vehicle body through the adsorber. The adsorber includes an adsorber bracket, which has a triangular structure. A suction cup is fixedly installed on the bottom of the adsorber bracket. A horizontal observation window is provided on the upper surface of the adsorber bracket. The laser height measuring instrument is fixed on the side of the adsorber.

[0015] Preferably, the vehicle body clamp comprises a clamping bolt, a connecting rod, an inner ball cage and a universal joint wrapping portion;

[0016] The clamping bolt is used to fix the longitudinal beam clamping part on the vehicle body to the vehicle body clamp body, the connecting rod is located at the bottom of the vehicle body clamp, the universal joint wrapping part is located at the upper part of the connecting rod, and the inner ball cage is installed in the universal joint wrapping part to realize the universal articulation of the connecting rod and the vehicle body clamp.

[0017] Preferably, the vehicle lift comprises a pressure plate, a push rod and a cushion block, wherein the push rod is located at the bottom of the vehicle lift and is powered by a lifting module motor.

[0018] Preferably, the vehicle lift also includes a clamp anti-detachment rod, which is slidably connected in the vehicle lift, and an anti-detachment groove is provided at the bottom of the clamp anti-detachment rod. The bottom of the clamp anti-detachment rod is a T-shaped structure, and the anti-detachment groove is used to prevent the clamp anti-detachment rod from detaching upward, and the connecting rod is threadedly connected to the clamp anti-detachment rod.

[0019] Preferably, an upward guide slope is provided on one side of the measuring platform, and a downward guide slope is provided on the other side of the measuring platform.

[0020] Preferably, the vehicle fastener is fixedly connected to the vehicle wheel via a strap.

[0021] A suspension stiffness measurement method, using the above-mentioned suspension stiffness measurement device, comprises the following steps:

[0022] Preparation stage:

[0023] The vehicle enters the measuring platform via the upward guide slope;

[0024] Install the laser height measuring instrument on the vehicle body;

[0025] The vehicle holder is fixedly installed on both sides of the four wheels, and the tire is fixed on the single-wheel axle load measuring instrument by passing the strap through the vehicle wheel hub. The axle load of each single wheel is measured by the single-wheel axle load measuring instrument to determine the current single axle load of each wheel;

[0026] Suspension compression process stiffness test phase:

[0027] The body clamp is fixedly connected with the longitudinal beam clamp, the connecting rod at the bottom of the body clamp is fixedly connected with the clamp anti-drop rod of the vehicle lifter, the pressing plate is fixed on the two pads to prevent the body clamp from rising, the compression module motor is started, and the vehicle is lifted by the push rod mechanism of the single-wheel axle load measuring instrument;

[0028] The tires of the vehicle are lifted by the single-wheel axle load measuring instrument. At this time, the suspension is in a slowly compressed state. The single-wheel axle load measuring instrument starts to work, and the single-wheel axle load begins to change, gradually increasing. The weight change transmits the signal to the equipment control device through the sensor in the four-wheel axle load measuring instrument. At the same time, the height of the laser height sensor and the ground also changes due to compression, and the sensor signal is transmitted to the equipment controller;

[0029] Suspension stretching process stiffness test phase:

[0030] The vehicle body clamp is fixed to the vehicle, and the vehicle is lifted by the top rod of the vehicle lift. At this time, since the wheels are fixed to the ground by the vehicle holder through straps, the single-wheel axle load measuring instrument also generates a force change signal. When the lifting module motor signal maintains a value, the lifting module motor stops working, and the single-wheel axle load measuring instrument transmits the signal to the equipment controller through the pressure sensor. At the same time, the height of the laser height sensor and the ground also changes due to the lifting, and the sensor transmits the signal to the equipment controller.

[0031] Preferably, the installation process of the laser height measuring instrument includes: fixing four laser height measuring instruments to four absorbers respectively by bolts, and installing the absorbers at the front ends of the left and right front wheels and the rear ends of the left and right rear wheels by means of their own suction cups;

[0032] Then adjust the horizontal position of the laser measuring instrument and observe whether the bubble in the horizontal observation window on the adsorber is centered. After the adjustment is completed, turn on the laser measuring instrument on the control screen and click the button to reset.

[0033] Preferably, the method further includes a result output stage:

[0034] Since the stiffness test results in a closed arc curve, the equipment controller fits it into a linear curve through an internal calculation formula. At this time, the Y / X value of the linear curve is the stiffness, and the suspension hysteresis force is the Y1-Y2 value of the closed arc curve when X is 0. The controller directly outputs the result to the control screen through calculation.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The suspension stiffness measuring device and method mentioned in the present invention can not only solve the problem of large suspension stiffness measurement error, but also measure the relevant suspension hysteresis force, providing an accurate reference for subsequent design, development and adjustment work. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of the suspension measurement device;

[0038] Figure 2 It is a schematic diagram of a laser height measuring instrument and a laser measuring instrument absorber;

[0039] Figure 3 It is a schematic diagram of wheel fixing;

[0040] Figure 4 It is a schematic diagram of the body clamping;

[0041] Figure 5 This is a detailed picture of the body clamp;

[0042] Figure 6 This is a detailed picture of a single wheel axle load measuring instrument;

[0043] Figure 7 Details of vehicle lift Figure 1 ;

[0044] Figure 8 Details of vehicle lift Figure 2 ;

[0045] Fig. 9 It is a schematic diagram of measuring the suspension compression state when measuring the suspension stiffness;

[0046] Fig.10 It is the suspension stiffness measurement and the schematic diagram of the suspension tension state measurement;

[0047] Fig.11It is the device control schematic diagram. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] like Figure 1-11 As shown, the present invention provides a technical solution: a suspension stiffness measuring device, comprising a measuring platform 1, a laser height measuring instrument 5, a single-wheel axle load measuring instrument 4 installed on the measuring platform, a vehicle body clamp 7, a vehicle lift 8 and a vehicle fixture 9; an upward guide slope 3 is provided on one side of the measuring platform 1, and a downward guide slope 2 is provided on the other side of the measuring platform 1.

[0050] When the vehicle enters the measuring platform 1, the vehicle fixture 9 is located on both sides of the wheel, and is used to fix the tire on the single-wheel axle load measuring instrument 4. The bottom of the single-wheel axle load measuring instrument 4 is fixedly connected with a push rod mechanism 4-1, and the push rod mechanism 4-1 uses a compression module motor to provide a power source. The single-wheel axle load measuring instrument 4 is used to detect the force value change signal during the suspension compression process and the suspension extension process;

[0051] The body clamp 7 is used to fix the longitudinal beam of the vehicle body; 3. The body clamp 7 includes a clamping bolt 7-2, a connecting rod 7-4, an inner ball cage 7-5 and a universal joint wrapping part 7-3;

[0052] The clamping bolt 7-2 is used to fix the longitudinal beam clamping part 7-1 on the vehicle body to the body clamp 7, the connecting rod 7-4 is located at the bottom of the body clamp 7, the universal joint wrapping part 7-3 is located at the upper part of the connecting rod 704, and the inner ball cage 7-5 is installed in the universal joint wrapping part 7-3 to realize the universal articulation of the connecting rod 7-4 and the body clamp 7.

[0053] The vehicle lift 8 is used to lift the vehicle. A pressure sensor is installed on the vehicle lift 8 to collect force value change signals generated during the lifting process. The vehicle lift 8 includes a pressure plate 8-1, a push rod 8-2 and a cushion block 8-3. The push rod 8-2 is located at the bottom of the vehicle lift 8. The push rod 8-2 is powered by the lifting module motor.

[0054] The vehicle lift 8 also includes a clamp anti-detachment rod 8-4, which is slidably connected in the vehicle lift 8. An anti-detachment groove 8-5 is provided at the bottom of the clamp anti-detachment rod 8-4. The bottom of the clamp anti-detachment rod 8-4 is a T-shaped structure. The anti-detachment groove 8-5 is used to prevent the clamp anti-detachment rod 8-4 from detaching upward. The connecting rod 7-4 is threadedly connected to the clamp anti-detachment rod 8-4.

[0055] The laser height measuring instrument 5 is installed on the vehicle. The height of the vehicle above the ground changes during the lifting process, which is collected by the laser height measuring instrument 5. The laser height measuring instrument 5 is fixed on the adsorber 6 and fixed to the vehicle body through the adsorber 6. The adsorber 6 includes an adsorber bracket 6-1. The adsorber bracket 6-1 has a triangular structure. A suction cup 6-3 is fixedly installed on the bottom of the adsorber bracket 6-1. A horizontal observation window 6-2 is provided on the upper surface of the adsorber bracket 6-1. The laser height measuring instrument 5 is fixed on the side of the adsorber 6.

[0056] The vehicle fastener 9 is fixedly connected to the vehicle wheel via a strap 10 .

[0057] It also includes a device controller 13 which receives measurement data from the single-wheel axle load measuring device 4 , the pressure sensor and the laser height measuring device 5 .

[0058] This embodiment also provides a suspension stiffness measurement method, comprising the following steps:

[0059] Preparation stage:

[0060] The vehicle enters the measuring platform 1 through the upward guide slope 3;

[0061] The laser height measuring device 5 is installed on the vehicle body; the installation process of the laser height measuring device 5 includes: fixing four laser height measuring devices 5 to four absorbers 6 respectively by bolts, and installing the absorbers 6 at the front ends of the left and right front wheels and the rear ends of the left and right rear wheels through the suction cups 6-3 provided therewith;

[0062] Then adjust the horizontal position of the laser measuring instrument 5, and observe whether the bubble in the horizontal observation window 6-2 on the adsorber 5-6 is centered. After the adjustment is completed, turn on the laser measuring instrument on the control large screen 12 and click the button to reset.

[0063] The vehicle fixing device 9 is fixedly mounted on both sides of the four wheels, and the tire is fixed on the single-wheel axle load measuring instrument 4 by passing the strap through the automobile wheel hub, and the axle load of each single wheel is measured by the single-wheel axle load measuring instrument 4 to determine the current single axle load of each wheel;

[0064] Suspension compression process stiffness test phase:

[0065] The vehicle body clamp 7 is fixedly clamped and connected to the longitudinal beam clamping part 7-1, the connecting rod 7-4 at the bottom of the vehicle body clamp 7 is fixedly connected to the clamp anti-drop rod 8-4 of the vehicle lifter 8, the pressing plate 8-1 is fixed on the two pads 8-3 to prevent the vehicle body clamp 7 from rising, the compression module motor is started, and the vehicle is lifted by the push rod mechanism 4-1 of the single-wheel axle load measuring instrument 4;

[0066] The tire positions of the whole vehicle are lifted by the single-wheel axle load measuring instrument 4. At this time, the suspension is in a slowly compressed state. The single-wheel axle load measuring instrument 4 starts to work, and the single-wheel axle load begins to change, showing a gradually increasing trend. The weight change transmits the signal to the equipment control device 13 through the sensor 4 in the four-wheel axle load measuring instrument. At the same time, the height of the laser height sensor 5 and the ground also changes due to compression, and the sensor signal is transmitted to the equipment controller 13;

[0067] Suspension stretching process stiffness test phase:

[0068] The vehicle body clamp 7 is fixedly clamped to the vehicle, and the vehicle is lifted by the top rod 8-2 of the vehicle lift 8. At this time, since the wheel is fixed to the ground by the vehicle fixer 9 through the strap 10, the single-wheel axle load measuring instrument 4 also generates a force change signal. When the lifting module motor signal maintains a value, the lifting module motor stops working, and the single-wheel axle load measuring instrument 4 transmits the signal to the equipment controller 13 through the pressure sensor. At the same time, the height of the laser height sensor 5 above the ground also changes due to the lifting, and the sensor transmits the signal to the equipment controller 13.

[0069] It also includes the result output stage:

[0070] Since a closed arc curve is presented after the stiffness test is completed, the equipment controller 13 fits it into a linear curve through an internal calculation formula. At this time, the Y / X value of the linear curve is the stiffness, and the suspension hysteresis force is the Y1-Y2 value of the closed arc curve when X is 0. The controller directly outputs the result to the control screen 12 through calculation.

[0071] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A suspension stiffness measuring device, characterized in that: It comprises a measuring platform (1), a laser height measuring instrument (5), a single wheel axle load measuring instrument (4) installed on the measuring platform, a vehicle body clamp (7), a vehicle lift (8) and a vehicle fixer (9); When the vehicle enters the measuring platform (1), the vehicle fixing device (9) is located on both sides of the wheel and is used to fix the tire on the single-wheel axle load measuring instrument (4). The bottom of the single-wheel axle load measuring instrument (4) is fixedly connected to a push rod mechanism (4-1). The push rod mechanism (4-1) uses a compression module motor to provide a power source. The single-wheel axle load measuring instrument (4) is used to detect force value change signals during the suspension compression process and the suspension extension process. The body clamp (7) is used to fix the longitudinal beam of the vehicle body; The vehicle lift (8) is used to lift the vehicle, and a pressure sensor is installed on the vehicle lift (8) to collect a force value change signal generated during the lifting process; The laser height measuring device (5) is installed on the vehicle, and the height of the vehicle above the ground changes during the lifting process, which is collected by the laser height measuring device (5); It also includes a device controller (13), which receives measurement data from the single-wheel axle load measuring instrument (4), the pressure sensor and the laser height measuring instrument (5).

2. A suspension stiffness measuring device according to claim 1, characterized in that: The laser height measuring instrument (5) is fixed on an absorber (6) and fixed on a vehicle body through the absorber (6). The absorber (6) comprises an absorber bracket (6-1). The absorber bracket (6-1) is in a triangular structure. A suction cup (6-3) is fixedly mounted on the bottom of the absorber bracket (6-1). A horizontal observation window (6-2) is provided on the upper surface of the absorber bracket (6-1). The laser height measuring instrument (5) is fixed on the side of the absorber (6).

3. A suspension stiffness measuring device according to claim 1, characterized in that: The vehicle body clamp (7) comprises a clamping bolt (7-2), a connecting rod (7-4), an inner ball cage (7-5) and a universal joint wrapping part (7-3); The clamping bolt (7-2) is used to fix the longitudinal beam clamping part (7-1) on the vehicle body to the body of the vehicle body clamp (7), the connecting rod (7-4) is located at the bottom of the vehicle body clamp (7), the universal joint wrapping part (7-3) is located at the upper part of the connecting rod (704), and the inner ball cage (7-5) is installed in the universal joint wrapping part (7-3) to realize the universal articulation of the connecting rod (7-4) and the vehicle body clamp (7).

4. A suspension stiffness measuring device according to claim 3, characterized in that: The vehicle lift (8) comprises a pressure plate (8-1), a push rod (8-2) and a cushion block (8-3); the push rod (8-2) is located at the bottom of the vehicle lift (8); and the push rod (8-2) is powered by a lifting module motor.

5. A suspension stiffness measuring device according to claim 4, characterized in that: The vehicle lift (8) also includes a clamp anti-detachment rod (8-4), which is slidably connected in the vehicle lift (8), and an anti-detachment groove (8-5) is arranged at the bottom of the clamp anti-detachment rod (8-4), and the bottom of the clamp anti-detachment rod (8-4) is a T-shaped structure, and the anti-detachment groove (8-5) is used to prevent the clamp anti-detachment rod (8-4) from detaching upwards, and the connecting rod (7-4) is threadedly connected to the clamp anti-detachment rod (8-4).

6. A suspension stiffness measuring device according to claim 1, characterized in that: An upward guide slope (3) is arranged on one side of the measuring platform (1), and a downward guide slope (2) is arranged on the other side of the measuring platform (1).

7. A suspension stiffness measuring device according to claim 4, characterized in that: The vehicle fixer (9) is fixedly connected to the vehicle wheel via a binding belt (10).

8. A suspension stiffness measurement method, characterized in that: A suspension stiffness measuring device as claimed in any one of claims 1 to 7 is used, comprising the following steps: Preparation stage: The vehicle enters the measuring platform (1) via the upward guide slope (3); Mounting a laser height measuring instrument (5) on the vehicle body; The vehicle fixing device (9) is fixedly mounted on both sides of the four wheels, and the tires are fixed on the single-wheel axle load measuring instrument (4) by passing the straps through the wheel hubs of the vehicle, and the axle load of each single wheel is measured by the single-wheel axle load measuring instrument (4) to determine the current single axle load of each wheel; Suspension compression process stiffness test phase: The vehicle body clamp (7) is fixedly clamped and connected to the longitudinal beam clamping portion (7-1), the connecting rod (7-4) at the bottom of the vehicle body clamp (7) is fixedly connected to the clamp anti-slip rod (8-4) of the vehicle lifter (8), the pressing plate (8-1) is fixed on two pads (8-3) to prevent the vehicle body clamp (7) from rising, the compression module motor is started, and the vehicle is lifted through the push rod mechanism (4-1) of the single-wheel axle load measuring instrument (4); The tire positions of the whole vehicle are lifted by the single-wheel axle load measuring instrument (4). At this time, the suspension is in a slowly compressed state, the single-wheel axle load measuring instrument (4) starts to work, and the single-wheel axle load begins to change, showing a gradual increase trend. The weight change transmits a signal to the equipment control device (13) through the sensor of the four-wheel axle load measuring instrument (4). At the same time, the height of the laser height sensor (5) and the ground also changes due to compression, and the sensor signal is transmitted to the equipment controller (13); Suspension stretching process stiffness test phase: The vehicle body clamp (7) is fixedly clamped to the vehicle, and the vehicle is fixed by the top rod (8-2) of the vehicle lift (8). At this time, since the wheel is fixed to the ground by the vehicle fixer (9) through the strap (10), the single-wheel axle load measuring instrument (4) also generates a force change signal at the same time. When the lifting module motor signal maintains a value, the lifting module motor stops working, and the single-wheel axle load measuring instrument (4) transmits the signal to the equipment controller (13) through the pressure sensor. At the same time, the height of the laser height sensor (5) and the ground also changes due to the lifting, and the sensor transmits the signal to the equipment controller (13).

9. A suspension stiffness measurement method according to claim 8, characterized in that: The installation process of the laser height measuring instrument (5) comprises: fixing four laser height measuring instruments (5) to four absorbers (6) respectively by means of bolts, and installing the absorbers (6) at the front ends of the left and right front wheels and the rear ends of the left and right rear wheels by means of the suction cups (6-3) provided therewith; Then adjust the horizontal position of the laser measuring instrument (5) and observe whether the bubble in the horizontal observation window (6-2) on the adsorber (5-6) is centered. After the adjustment is completed, turn on the laser measuring instrument on the control large screen (12) and click the button to reset.

10. A suspension stiffness measurement method according to claim 8, characterized in that: It also includes the result output stage: Since the result of the stiffness test is a closed arc curve, the equipment controller (13) fits it into a linear curve through an internal calculation formula. At this time, the Y / X value of the linear curve is the stiffness, and the suspension hysteresis force is the Y1-Y2 value of the closed arc curve when X is 0. The controller directly outputs the result to the control screen (12) through calculation.

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