A damping adjustment device and method for a mountain bike shock absorber

Abstract

The present invention relates to the technical field of damping adjustment of shock absorbers, and discloses a damping adjustment device and method for shock absorbers of mountain bikes, wherein the device comprises a three-axis acceleration sensor, a controller, an angular displacement sensor and an actuator; the three-axis acceleration sensor is installed on the mountain bike, the angular displacement sensor is installed on the adjustment knob of the shock absorber, and the actuator is connected to the rotating shaft of the adjustment knob by transmission; the three-axis acceleration sensor is electrically connected to the controller and used to detect the horizontal acceleration and vertical acceleration of the mountain bike; the angular displacement sensor is electrically connected to the controller and used to detect the real-time rotation angle of the adjustment knob; the controller is electrically connected to the actuator and used to send an angle adjustment value to the actuator according to the horizontal acceleration, the vertical acceleration and the real-time rotation angle, and the actuator is used to adjust the rotation angle of the adjustment knob according to the angle adjustment value. The present invention has the technical effect of automatically adjusting the damping of the shock absorber and high damping adjustment accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of shock absorber damping adjustment, and in particular to a damping adjustment device and method for a mountain bike shock absorber. Background Art

[0002] In order to reduce the vibration of the frame during riding, make the ride smoother, and thus improve the maneuverability, riding comfort and safety of mountain bikes, many mountain bikes are equipped with shock absorbers on the front fork. In different sections of the road, by adjusting the damping of the shock absorber, the working effect of the shock absorber can be adjusted, so that the mountain bike is in the most suitable working state. However, the damping adjustment of the current mountain bike shock absorber is manually adjusted, and the rider manually adjusts the compression damping adjustment knob located on the fork crown and the rebound damping adjustment knob located on the fork foot. The manual adjustment of the shock absorber damping has the following problems: manual adjustment is not easy to control, especially for beginners, the adjustment is difficult, the adjustment is not skilled, resulting in a long adjustment time and poor adjustment effect; and the damping adjustment needs to be carried out during riding, even skilled riders may not be able to adjust correctly or even accurately during riding; especially when competing or riding on harsh sections, the rider needs to focus on controlling the bike and cannot adjust. Summary of the invention

[0003] The purpose of the present invention is to overcome the above technical deficiencies and provide a damping adjustment device and method for a mountain bike shock absorber to solve the technical problems in the prior art that the damping adjustment of the shock absorber is difficult, has low accuracy, and cannot be accurately adjusted during riding.

[0004] In order to achieve the above technical objectives, the technical solution of the present invention provides a damping adjustment device for a mountain bike shock absorber, comprising a three-axis acceleration sensor, a controller, an angular displacement sensor and an actuator;

[0005] The three-axis acceleration sensor is installed on the mountain bike, the angular displacement sensor is installed on the adjustment knob of the shock absorber, and the actuator is connected to the rotating shaft of the adjustment knob; the three-axis acceleration sensor is electrically connected to the controller and is used to detect the horizontal acceleration and vertical acceleration of the mountain bike; the angular displacement sensor is electrically connected to the controller and is used to detect the real-time rotation angle of the adjustment knob; the controller is electrically connected to the actuator and is used to send an angle adjustment value to the actuator according to the horizontal acceleration, vertical acceleration and real-time rotation angle, and the actuator is used to adjust the rotation angle of the adjustment knob according to the angle adjustment value.

[0006] The present invention also provides a damping adjustment method for a mountain bike shock absorber, comprising the following steps:

[0007] Detecting the horizontal acceleration and vertical acceleration of the mountain bike;

[0008] Detect the real-time rotation angle of the adjustment knob of the shock absorber;

[0009] Send an angle adjustment value according to the horizontal acceleration, vertical acceleration, and real-time rotation angle;

[0010] Adjust the rotation angle of the adjustment knob according to the angle adjustment value.

[0011] Compared with the prior art, the beneficial effects of the present invention include: The present invention first detects the motion state of the mountain bike through a three-axis accelerometer, detects the real-time rotation angle of the adjustment knob through an angular displacement sensor as the reference angle for adjustment, the controller determines the angle adjustment value based on the current real-time rotation angle according to the current motion state of the mountain bike, and the actuator adjusts the adjustment knob according to the angle adjustment value, thereby realizing the automatic adjustment of the shock absorber damping during riding, liberating the hands of the rider, and enabling the rider to concentrate on riding. The horizontal acceleration and vertical acceleration detected by the three-axis accelerometer can objectively and accurately reflect the real-time motion state of the mountain bike, providing an accurate and objective adjustment basis for damping adjustment, thereby improving the damping adjustment accuracy. Description of the Drawings

[0012] Figure 1 is the circuit structure diagram of an embodiment of the damping adjustment device for a mountain bike shock absorber provided by the present invention;

[0013] Figure 2 is the flowchart of an embodiment of the damping adjustment method for a mountain bike shock absorber provided by the present invention.

[0014] Reference Signs:

[0015] 1. Three-axis accelerometer, 2. Controller, 3. Angular displacement sensor, 4. Actuator. Detailed Embodiments

[0016] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] Example 1

[0018] As Figure 1 shown, Embodiment 1 of the present invention provides a damping adjustment device for a mountain bike shock absorber, including a three-axis accelerometer 1, a controller 2, an angular displacement sensor 3, and an actuator 4;

[0019] The three-axis acceleration sensor 1 is installed on the mountain bike, the angular displacement sensor 3 is installed on the adjustment knob of the shock absorber, and the actuator 4 is transmission-connected to the rotating shaft of the adjustment knob; the three-axis acceleration sensor 1 is electrically connected to the controller 2, and is used to detect the horizontal acceleration and vertical acceleration of the mountain bike; the angular displacement sensor 3 is electrically connected to the controller 2, and is used to detect the real-time rotation angle of the adjustment knob; the controller 2 is electrically connected to the actuator 4, and is used to send an angle adjustment value to the actuator 4 according to the horizontal acceleration, vertical acceleration and real-time rotation angle, and the actuator 4 is used to adjust the rotation angle of the adjustment knob according to the angle adjustment value.

[0020] The embodiment of the present invention uses a three-axis acceleration sensor 1 to detect the acceleration of the mountain bike in the horizontal and vertical directions, and uses it as an input signal of the controller 2. The controller 2 determines the current running state of the mountain bike according to the horizontal acceleration and the vertical acceleration. If the mountain bike is in a relatively stable section, that is, the vertical acceleration is small, and the riding speed is stable, that is, the horizontal acceleration is small, then the damping value of the shock absorber needs to be adjusted to a smaller value, the grip is reduced, the riding speed is guaranteed, and the riding damping is reduced; if the mountain bike is in a relatively uneven and steep section, that is, the vertical acceleration is large, and the riding speed fluctuates greatly due to the poor road conditions, that is, the horizontal acceleration is large, then the damping value of the shock absorber needs to be adjusted to a larger value, the grip is increased, and the riding safety is guaranteed. The above "larger" and "smaller" are relative concepts, and the specific adjustment value can be set according to the actual situation. For example, a corresponding relationship between the horizontal acceleration and the vertical acceleration of different ranges and the standard rotation angle value of the adjustment knob will be established, and then the adjustment knob can be adjusted in real time according to the corresponding relationship. The angular displacement sensor 3 is used to detect the real-time rotation angle of the adjustment knob and provide an adjustment reference value for the angle adjustment value of the controller 2. For example, if the real-time rotation angle is less than the standard rotation angle value, the rotation angle is increased; if the real-time rotation angle is greater than the standard rotation angle value, the rotation angle is reduced. The real-time rotation angle detected by the angular displacement sensor 3 also provides adjustment feedback for the angle adjustment of the controller 2 to ensure that the adjustment is in place. The controller 2 drives the actuator 4, and the actuator 4 rotates, driving the adjustment knob to rotate, thereby changing the real-time rotation angle of the adjustment knob to adjust the damping of the shock absorber.

[0021] The present invention realizes automatic adjustment of the shock absorber, and does not need to manually adjust the shock absorber during driving, thereby reducing the complexity of adjusting the damping of the mountain bike shock absorber, thereby making it easier to use. At the same time, the adjustment of the shock absorber damping is based on the detection of the driving state of the mountain bike by the three-axis acceleration sensor 1, thereby realizing automatic adjustment of the shock absorber damping according to different road conditions, improving the comfort and safety during riding, allowing the rider to focus on controlling the bike without having to be distracted by adjusting the shock absorber, and helping the rider to improve the performance of the race.

[0022] Preferably, the actuator 4 is a stepper motor.

[0023] After the controller 2 outputs an angle adjustment value, it drives the actuator 4 to change the angular displacement of the adjustment knob, thereby changing the magnitude of the shock absorber damping. In this embodiment, the actuator 4 is implemented by a stepper motor. The rotation of the stepper motor drives the adjustment knob to rotate, thus achieving the damping adjustment effect. The transmission connection between the stepper motor and the adjustment knob can be implemented by existing technologies, and the control logic of the controller 2 for the stepper motor can also be implemented by existing technologies, which will not be elaborated here.

[0024] Preferably, the triaxial acceleration sensor 1 is electrically connected to the controller 2 through a low-pass filter circuit, an amplifier circuit, and an analog-to-digital conversion circuit in sequence.

[0025] The low-pass filter circuit is used to filter and condition the detection data of the triaxial acceleration sensor 1 to avoid interference from clutter signals to the detection results. The amplifier circuit and the analog-to-digital conversion circuit amplify and perform analog-to-digital conversion on the detection data respectively to facilitate the processing by the controller 2. In this embodiment, the triaxial acceleration sensor 1 uses a DYTRAN 3293A high-sensitivity triaxial acceleration sensor 1, which integrates an amplifier circuit and a low-pass filter circuit inside, so there is no need to additionally set up a low-pass filter circuit and an amplifier circuit. The controller 2 uses an MCU, that is, a microcontroller 2. For example, an ARM Cortex M4F can be used. The ARM Cortex M4F integrates an analog-to-digital conversion module, so there is no need to additionally set up an analog-to-digital conversion circuit. In this embodiment, the angular displacement sensor 3 uses an AS5040 non-contact magnetic rotary encoder, which outputs digitally, does not require analog-to-digital conversion, and can accurately measure angles within 360°.

[0026] Preferably, the number of the adjustment knobs is two, and the two adjustment knobs are respectively a compression damping knob and a rebound damping knob;

[0027] The number of the angular displacement sensors 3 is two, and the two angular displacement sensors 3 are respectively a compression angular displacement sensor 3 and a rebound angular displacement sensor 3. The compression angular displacement sensor 3 is installed on the compression damping knob and is used to detect the real-time compression rotation angle of the compression damping knob. The rebound angular displacement sensor 3 is installed on the rebound damping knob and is used to detect the real-time rebound rotation angle of the rebound damping knob. The two angular displacement sensors 3 are both electrically connected to the controller 2;

[0028] The number of the actuators 4 is two. The two actuators 4 are a compression actuator 4 and a rebound actuator 4 respectively. The compression actuator 4 is in transmission connection with the rotating shaft of the compression damping knob, and the rebound actuator 4 is in transmission connection with the rotating shaft of the rebound damping knob. Both of the two actuators 4 are electrically connected to the controller 2. The controller 2 is configured to send a compression angle adjustment value to the compression actuator 4 according to the horizontal acceleration, the vertical acceleration, and the real-time compression rotation angle. The compression actuator 4 is configured to adjust the compression angle according to the compression angle adjustment value. The controller 2 is configured to send a rebound angle adjustment value to the rebound actuator 4 according to the horizontal acceleration, the vertical acceleration, and the real-time rebound rotation angle. The rebound actuator 4 is configured to adjust the rebound angle according to the rebound angle adjustment value.

[0029] Generally, there are two adjustment knobs on a shock absorber, namely a compression adjustment knob and a rebound adjustment knob. One of them can be selected for control, or both adjustment knobs can be controlled simultaneously. In this embodiment, both adjustment knobs are controlled simultaneously. The compression adjustment knob is used to adjust the compression damping of the shock absorber, and the rebound adjustment knob is used to adjust the rebound damping of the shock absorber to achieve more accurate damping adjustment.

[0030] The damping adjustment device of the mountain bike shock absorber provided by the present invention can realize the damping adjustment of the shock absorbers of different types of mountain bikes. However, since the damping adjustment device of the shock absorber provided by the present invention will adjust the damping in real time during riding, it is preferred to use a shock absorber with smooth and fluent damping adjustment. The shock absorber with smooth and fluent damping adjustment cooperates with the damping adjustment device of the mountain bike shock absorber provided by the present invention, which can achieve a better damping adjustment effect and enhance the user's riding experience.

[0031] Specifically, this embodiment provides a preferred shock absorber, which includes a compression damping tube, a rebound damping tube, a fork crown, and a steering tube. The compression damping tube and the rebound damping tube are respectively connected to two ends of the fork crown, the fork crown is connected to the steering tube, and the steering tube is used to connect to the front of the vehicle. The compression damping tube includes a compression inner tube and a compression outer tube. The compression outer tube is sleeved on the compression inner tube. A compression piston is slidably connected inside the compression inner tube. One end of the compression piston is fixed to one end of the compression outer tube. The compression piston divides the compression damping tube into two oil chambers. An oil hole is provided on the plug head of the compression piston. The compression adjustment knob is connected to the oil hole and is used to adjust the opening degree of the oil hole to control the flow rate of the oil, thereby controlling the telescopic speed of the compression damping tube and achieving the purpose of controlling the compression damping of the compression damping tube. The rebound damping tube includes a rebound outer tube and a rebound inner tube. The rebound outer tube is sleeved on the rebound inner tube. The top of the rebound inner tube is sealed. The bottom of the rebound inner tube is connected to an air chamber oil seal, which is used to prevent gas leakage from affecting the rebound effect. A rebound piston is slidably connected inside the rebound inner tube. An air chamber is formed between the rebound inner tube and the rebound piston. An air hole is provided at the top of the rebound inner tube. The rebound adjustment knob is connected to the air hole and is used to adjust the opening degree of the air hole to control the compression and rebound speed of the gas, thereby controlling the rebound speed of the rebound damping tube. A buffer spring is connected to the top of the rebound inner tube, and the buffer spring is connected to the rebound piston. The vehicle body indirectly pushes the rebound piston through the buffer spring, thereby indirectly compressing the air chamber through the buffer spring, making the air chamber compression smoother. One end of the tension spring is fixedly connected to the bottom of the rebound piston, and the other end is connected to the bottom of the rebound inner tube. When the air chamber is compressed, the tension spring is in a stretched state, enabling the rebound to be more rapid and playing a shock absorption role. In this embodiment, the tension spring and the buffer spring are used to achieve the elastic compression and rebound of the air chamber, thereby making the adjustment of the rebound damping smoother and more stable, without excessive fluctuations, reducing large vibrations during the damping adjustment process, and improving the riding comfort of users. The damping adjustment device of the mountain bike shock absorber provided by the present invention has a better cooperation effect with this shock absorber.

[0032] Example 2

[0033] As Figure 2 shown, Embodiment 2 of the present invention provides a damping adjustment method for a mountain bike shock absorber, including the following steps:

[0034] S1. Detect the horizontal acceleration and vertical acceleration of the mountain bike;

[0035] S2. Detect the real-time rotation angle of the adjustment knob of the shock absorber;

[0036] S3. Send an angle adjustment value according to the horizontal acceleration, vertical acceleration, and real-time rotation angle;

[0037] S4. Adjust the rotation angle of the adjustment knob according to the angle adjustment value.

[0038] The damping adjustment method of the mountain bike shock absorber provided by the embodiment of the present invention corresponds to the above-mentioned damping adjustment device of the mountain bike shock absorber. Therefore, the technical effects possessed by the above-mentioned damping adjustment device of the mountain bike shock absorber are also possessed by the damping adjustment method of the mountain bike shock absorber, and will not be elaborated here.

[0039] Preferably, an angle adjustment value is sent according to the horizontal acceleration, vertical acceleration, and real-time rotation angle, specifically:

[0040] Integrate the horizontal acceleration to obtain the horizontal velocity:

[0041] Integrate the vertical acceleration to obtain the vertical velocity, and integrate the vertical velocity to obtain the vertical displacement, that is, the amplitude of the mountain bike in the vertical direction;

[0042] Obtain the extreme moment when the amplitude extreme value is generated, calculate the time difference between two adjacent amplitude extreme values, and calculate the vibration frequency according to the time difference;

[0043] Calculate the angle adjustment value according to the horizontal velocity, amplitude, vibration frequency, and the initial rotation angle of the adjustment knob:

[0044]

[0045] Among them, ω is the angle adjustment value, f is the vibration frequency, v x is the horizontal velocity, a x is the horizontal acceleration, ω0 is the initial rotation angle, C0, C1, C2, and C3 are all adjustment coefficients, and n0, n1, n2, and n3 are all adjustment exponents.

[0046] In this embodiment, the controller 2 calculates the angle adjustment value according to the amplitude, vibration frequency, and horizontal velocity data. Integrating the continuous acceleration can obtain the velocity value at any time; integrating the continuous velocity values can obtain the displacement value at any time. Therefore, there is:

[0047]

[0048]

[0049] Among them, v x represents the horizontal velocity, that is, the speed when the mountain bike is traveling; A represents the amplitude; v 0x represents the horizontal initial velocity, v 0y represents the vertical initial velocity, v 0x and v 0y are generally 0; a x represents the horizontal acceleration, a yDenote the vertical acceleration; \(t_0\) represents the initial moment, and \(t_1\) represents the real-time moment. By continuously integrating the vertical acceleration, a continuous amplitude-time curve can be obtained. By calculating the time difference between two adjacent amplitude extrema, the real-time vibration frequency \(f\) of the vehicle body can be calculated.

[0050] It is stipulated that the position of the adjustment knob when it is at the maximum damping value is the 0 point. The adjustment amount is positive when adjusted counterclockwise and negative when adjusted clockwise. Each adjustment coefficient and each adjustment index are constants. Each adjustment coefficient and each adjustment index can be set through manual debugging. For example, according to the road conditions, manually adjust the adjustment knob to an appropriate position, and then substitute the detection data of the three-axis acceleration sensor 1 and the angular displacement sensor 3 into the formula for the adjustment angle value to calculate the values of each adjustment coefficient and each adjustment index. After setting each adjustment coefficient and each adjustment index according to the calculation results, the automatic adjustment of the damping can be realized.

[0051] Preferably, the number of the adjustment knobs is two, and the two adjustment knobs are respectively a compression damping knob and a rebound damping knob;

[0052] Detect the real-time rotation angle of the adjustment knob of the shock absorber; send an angle adjustment value according to the horizontal acceleration, the vertical acceleration and the real-time rotation angle; adjust the rotation angle of the adjustment knob according to the angle adjustment value, specifically including:

[0053] Detect the real-time compression rotation angle of the compression damping knob and the real-time rebound rotation angle of the rebound damping knob;

[0054] Send a compression angle adjustment value according to the horizontal acceleration, the vertical acceleration and the real-time compression rotation angle, and send a rebound angle adjustment value according to the horizontal acceleration, the vertical acceleration and the real-time rebound rotation angle;

[0055] Adjust the compression angle according to the compression angle adjustment value and adjust the rebound angle according to the rebound angle adjustment value.

[0056] The specific embodiments of the present invention described above do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A damping adjustment method for a mountain bike shock absorber, characterized in that The following steps are involved: Detect the horizontal acceleration and vertical acceleration of the mountain bike; Detect the real-time rotation angle of the shock absorber's adjustment knob; Sending an angle adjustment value according to the horizontal acceleration, the vertical acceleration and the real-time rotation angle; adjusting the rotation angle of the adjusting knob according to the angle adjustment value; The angle adjustment value is sent according to the horizontal acceleration, the vertical acceleration and the real-time rotation angle, specifically: Integrating the horizontal acceleration yields the horizontal velocity: Integrating the vertical acceleration to obtain a vertical velocity, and integrating the vertical velocity to obtain a vertical displacement, that is, an amplitude of the mountain bike in the vertical direction; Obtaining the moment when the amplitude extreme value is generated, calculating the time difference between two adjacent amplitude extreme values, and calculating the vibration frequency according to the time difference; The angle adjustment value is calculated according to the horizontal speed, amplitude, vibration frequency and the initial rotation angle of the adjustment knob: Wherein, is the angle adjustment value, is the vibration frequency, is the horizontal speed, is the horizontal acceleration, is the initial rotation angle, , , , are all adjustment coefficients, , , , are all adjustment exponents.

2. The damping adjustment method of the mountain bike shock absorber according to claim 1, characterized in that, There are two adjusting knobs, and the two adjusting knobs are respectively a compression damping knob and a rebound damping knob; Detecting a real-time rotation angle of an adjusting knob of a shock absorber; sending an angle adjustment value according to the horizontal acceleration, the vertical acceleration and the real-time rotation angle; and adjusting the rotation angle of the adjusting knob according to the angle adjustment value, specifically comprising: detecting a real-time compression rotation angle of the compression damping knob, and detecting a real-time rebound rotation angle of the rebound damping knob; sending a compression angle adjustment value according to the horizontal acceleration, the vertical acceleration and the real-time compression rotation angle, and sending a rebound angle adjustment value according to the horizontal acceleration, the vertical acceleration and the real-time rebound rotation angle; The compression angle is adjusted according to the compression angle adjustment value, and the rebound angle is adjusted according to the rebound angle adjustment value.

3. A damping adjustment device for a mountain bike shock absorber, which is used to implement the damping adjustment method of the mountain bike shock absorber according to any one of claims 1-2, characterized in that, It includes a three-axis acceleration sensor, a controller, an angular displacement sensor and an actuator; The three-axis acceleration sensor is installed on the mountain bike, the angular displacement sensor is installed on the adjustment knob of the shock absorber, and the actuator is connected to the rotating shaft of the adjustment knob; the three-axis acceleration sensor is electrically connected to the controller and is used to detect the horizontal acceleration and vertical acceleration of the mountain bike; the angular displacement sensor is electrically connected to the controller and is used to detect the real-time rotation angle of the adjustment knob; the controller is electrically connected to the actuator and is used to send an angle adjustment value to the actuator according to the horizontal acceleration, vertical acceleration and real-time rotation angle, and the actuator is used to adjust the rotation angle of the adjustment knob according to the angle adjustment value.

4. The damping adjustment device of the mountain bike shock absorber according to claim 3, characterized in that The actuator is a stepping motor.

5. The damping adjustment device of the mountain bike shock absorber according to claim 3, characterized in that, The three-axis acceleration sensor is electrically connected to the controller via a low-pass filter circuit, an amplifier circuit and an analog-to-digital conversion circuit in sequence.

6. The damping adjustment device of the mountain bike shock absorber according to claim 3, characterized in that, There are two adjusting knobs, and the two adjusting knobs are respectively a compression damping knob and a rebound damping knob; The number of the angular displacement sensors is two. The two angular displacement sensors are respectively a compression angular displacement sensor and a rebound angular displacement sensor. The compression angular displacement sensor is installed on the compression damping knob and is used to detect the real-time compression rotation angle of the compression damping knob. The rebound angular displacement sensor is installed on the rebound damping knob and is used to detect the real-time rebound rotation angle of the rebound damping knob. Both of the two angular displacement sensors are electrically connected to the controller; The number of the actuators is two. The two actuators are respectively a compression actuator and a rebound actuator. The compression actuator is in transmission connection with the rotation shaft of the compression damping knob. The rebound actuator is in transmission connection with the rotation shaft of the rebound damping knob. Both of the two actuators are electrically connected to the controller. The controller is used to send a compression angle adjustment value to the compression actuator according to the horizontal acceleration, the vertical acceleration and the real-time compression rotation angle. The compression actuator is used to adjust the compression angle according to the compression angle adjustment value. The controller is used to send a rebound angle adjustment value to the rebound actuator according to the horizontal acceleration, the vertical acceleration and the real-time rebound rotation angle. The rebound actuator is used to adjust the rebound angle according to the rebound angle adjustment value.

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