Vibration energy collecting device of automobile suspension system

Abstract

The invention is suitable for the technical field of energy recovery devices, and provides an automobile suspension system vibration energy collection device which comprises a shell, a friction module, an electromagnetic module and an energy storage device used for storing electric energy generated by the friction module and the electromagnetic module. The shell comprises a first shell body and a second shell body arranged on the first shell body in a sliding mode, the electromagnetic module comprises a power generation magnet arranged on the first shell body and a coil arranged on the second shell body, and the second shell body moves relative to the first shell body so that the power generation magnet can move in the coil; the friction module comprises a first friction layer fixedly arranged on the first shell and a second friction layer fixedly arranged on the second shell, the first friction layer abuts against the second friction layer, and the second shell moves relative to the first shell so that friction power generation can be conducted on the first friction layer and the second friction layer. Through cooperation of electromagnetic power generation and friction power generation, full-spectrum capture of vibration energy of the suspension is achieved, and the energy recovery efficiency is greatly improved compared with a single mode.

Description

Technical Field

[0001] The invention belongs to the technical field of energy recovery devices, and in particular relates to a vibration energy collection device for an automobile suspension system. Background Art

[0002] As the automotive industry develops towards greater intelligence and energy efficiency, the intelligentization of automotive suspension systems has gradually become a research hotspot. The automotive suspension system is not only responsible for vehicle comfort and stability, but also can recover vibration energy through its unique working principle.

[0003] Currently, research on vibration energy harvesting devices focuses on energy recovery through electromagnetic induction. By integrating electromagnetic devices into the suspension system, the vibrations of the vehicle body are converted into electrical energy through the principle of electromagnetic induction. However, electromagnetic devices have difficulty recovering vibration energy at low frequencies, resulting in low energy recovery efficiency in existing vibration energy harvesting devices. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a vibration energy harvesting device for an automobile suspension system, aiming to solve the problem of low energy recovery efficiency of existing vibration energy harvesting devices.

[0005] An embodiment of the present application is implemented as follows: a vibration energy collection device for an automobile suspension system includes a housing, a friction module, an electromagnetic module, and an energy storage device for storing electrical energy generated by the friction module and the electromagnetic module; the housing includes a first shell and a second shell slidably arranged on the first shell, the electromagnetic module includes a power-generating magnet arranged on the first shell and a coil arranged on the second shell, the second shell moves relative to the first shell to enable the power-generating magnet to move in the coil; the friction module includes a first friction layer fixed to the first shell, and a second friction layer fixed to the second shell, the first friction layer abuts against the second friction layer, and the second shell moves relative to the first shell to enable the first friction layer and the second friction layer to generate electricity by friction.

[0006] In some preferred embodiments of the present application, a piezoelectric module connected to the housing is further included, and the second housing slides relative to the first housing, causing the piezoelectric module to produce a piezoelectric effect and thereby generate electrical energy.

[0007] In some preferred embodiments of the present application, the piezoelectric module includes a first piezoelectric sheet and a second piezoelectric sheet, one end of the first piezoelectric sheet is fixed to the first shell, one end of the second piezoelectric sheet is fixed to the second shell, the other end of the first piezoelectric sheet is provided with a first magnet, and the other end of the second piezoelectric sheet is provided with a second magnet, the first magnet and the second magnet cooperate to generate a repulsive force to bend the first piezoelectric sheet and the second piezoelectric sheet, and the second shell slides relative to the first shell to align or deviate the first magnet and the second magnet.

[0008] In some preferred embodiments of the present application, the first shell and the second shell are both cylindrical structures with one end open and the other end closed, the openings of the first shell and the second shell are opposite to each other, the second shell is sleeved on the outer periphery of the first shell to form an installation cavity, and the electromagnetic module is arranged in the installation cavity.

[0009] In some preferred embodiments of the present application, the first friction layer is fixedly arranged on the outer circumference of the first shell, the second friction layer is fixedly arranged on the inner circumference of the second shell, and the second shell is sleeved on the first shell so that the first friction layer and the second friction layer abut against each other to close the installation cavity.

[0010] In some preferred embodiments of the present application, the first friction layer is a fluorinated ethylene propylene film, and the second friction layer is a copper foil film.

[0011] In some preferred embodiments of the present application, the friction module, the electromagnetic module and the piezoelectric module are connected to the energy storage device through a control module. The control module is also connected to a sensor for monitoring the vibration frequency of the first shell relative to the second shell. The control module is used to control the connection and disconnection of the energy storage device and the friction module, the electromagnetic module and the piezoelectric module.

[0012] In some preferred embodiments of the present application, when the vibration frequency of the first shell relative to the second shell is 0Hz-3Hz, the control module controls the friction module to be connected to the energy storage device alone; when the vibration frequency of the first shell relative to the second shell is 3Hz-10Hz, the control module controls the piezoelectric module to be connected to the energy storage device alone; when the vibration frequency of the first shell relative to the second shell is 10Hz-25Hz, the control module controls the electromagnetic module to be connected to the energy storage device alone.

[0013] An embodiment of the present application provides a vibration energy collection device for an automobile suspension system. Through the coordination of electromagnetic power generation and friction power generation, electromagnetic power generation has a higher power generation efficiency in the high frequency of the suspension, and friction power generation has a higher power generation efficiency in the low frequency vibration, thereby realizing full spectrum capture of the suspension vibration energy, and the energy recovery efficiency is greatly improved compared with a single electromagnetic recovery mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the three-dimensional structure of a vibration energy harvesting device for an automobile suspension system provided in an embodiment of the present application;

[0015] Figure 2 for Figure 1 A cross-sectional view of a vibration energy harvesting device for an automobile suspension system in an embodiment;

[0016] Figure 3 A cross-sectional view of another automobile suspension system vibration energy harvesting device provided in an embodiment of the present application.

[0017] in:

[0018] 110. First shell; 111. First ring column; 120. Second shell; 121. Second ring column; 130. Spring; 210. Power generating magnet; 220. Coil; 310. First friction layer; 320. Second friction layer; 410. First piezoelectric sheet; 420. Second piezoelectric sheet; 430. First magnet; 440. Second magnet. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, 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 intended to limit the present invention.

[0020] The specific implementation of this application is described in detail below in conjunction with specific embodiments.

[0021] like Figure 1 and Figure 2 As shown, an automobile suspension system vibration energy collection device provided in an embodiment of the present application includes a housing, a friction module, an electromagnetic module, and an energy storage device for storing electrical energy generated by the friction module and the electromagnetic module.

[0022] like Figure 2 As shown, the housing includes a first shell 110 and a second shell 120 slidably disposed on the first shell 110. The electromagnetic module includes a power generation magnet 210 disposed on the first shell 110 and a coil 220 disposed on the second shell 120. The second shell 120 moves relative to the first shell 110 so that the power generation magnet 210 moves within the coil 220. In some embodiments, as Figure 2As shown, a vertically arranged first ring column 111 is fixed to the inner bottom wall of the first shell 110, and a vertically arranged second ring column 121 is fixed to the inner top wall of the second shell 120. The upper end of the first ring column 111 is open, and the lower end of the second ring column 121 is open. The second ring column 121 is sleeved on the outside of the first ring column 111. The power generation magnet 210 is clamped inside the first ring column 111, and the coil 220 is sleeved on the outside of the second ring column 121. Figure 2 As shown, when the second housing 120 reciprocates vertically relative to the first housing 110, the second ring column 121 drives the coil 220 to move up and down. This allows the power-generating magnet 210 to move relative to the coil 220, causing the magnetic flux passing through the coil 220 to change, thereby generating an induced electromotive force in the coil 220 and achieving power generation. In some embodiments, the first housing 110 and the second housing 120 are respectively fixed to the vehicle body and suspension. The relative movement of the vehicle body and suspension drives the relative movement of the first housing 110 and the second housing 120.

[0023] In some embodiments, as Figure 1 As shown, the first housing 110 and the second housing 120 are connected by a spring 130. In this embodiment, the first housing 110 is directly fixed to the suspension, while the second housing 120 is free to move. When the suspension vibrates, it drives the first housing 110 to move up and down, and to reciprocate relative to the second housing 120. The spring 130 prevents the first housing 110 and the second housing 120 from completely separating, and provides a buffer.

[0024] like Figure 2 As shown, the friction module includes a first friction layer 310 fixed to the first housing 110 and a second friction layer 320 fixed to the second housing 120. The first friction layer 310 and the second friction layer 320 are in contact with each other, and the second housing 120 moves relative to the first housing 110, enabling triboelectric power generation between the first and second friction layers 310, 320. In this embodiment, the first and second friction layers 310, 320 are made of materials with different electronegativity. Driven by the housing, the first and second friction layers 310, 320 contact and separate, resulting in charge transfer between the surfaces of the first and second friction layers 310, 320, creating a potential difference. This generates current through an external circuit, thus achieving triboelectric power generation.

[0025] In this embodiment, electromagnetic and triboelectric generation work in synergy, achieving higher efficiency at high frequencies and lower frequencies. This allows for full spectrum capture of suspension vibration energy, significantly improving energy recovery efficiency compared to single-mode operation. This avoids the problem of reduced efficiency at low frequencies, which can lead to lower energy recovery efficiency.

[0026] In some embodiments of the present application, the automobile suspension system vibration energy collection device also includes a piezoelectric module connected to the shell, and the second shell 120 slides relative to the first shell 110, so that the piezoelectric module generates a piezoelectric effect and generates electrical energy. In this embodiment, the piezoelectric module generates electricity through the piezoelectric effect, and the piezoelectric module can have a high power generation efficiency in the medium-frequency vibration of the automobile suspension. In conjunction with the friction module's power generation at low frequencies and the electromagnetic module's power generation at high frequencies, the three modes work together to achieve full-spectrum capture of the suspension vibration energy, and the energy recovery efficiency is relatively improved. In some embodiments of the present application, the piezoelectric modules are arrayed in multiple groups in the mounting cavity of the shell to improve the power generation efficiency.

[0027] In some embodiments of the present application, the piezoelectric module includes a first piezoelectric sheet 410 and a second piezoelectric sheet 420. One end of the first piezoelectric sheet 410 is fixed to the first housing 110, and one end of the second piezoelectric sheet 420 is fixed to the second housing 120. A first magnet 430 is provided at the other end of the first piezoelectric sheet 410, and a second magnet 440 is provided at the other end of the second piezoelectric sheet 420. The first magnet 430 and the second magnet 440 cooperate to generate a repulsive force to bend the first and second piezoelectric sheets 410 and 420. The second housing 120 slides relative to the first housing 110 to align or deviate the first and second magnets 430 and 440. In this embodiment, when the second housing 120 is raised and lowered and slid relative to the first housing 110, the first and second magnets 430 and 440 will align and deviate. When aligned, the first and second magnets 430 and 440 repel each other, causing the first and second piezoelectric sheets 410 and 420 to bend and deform, generating a piezoelectric effect. When the first piezoelectric sheet 410 and the second piezoelectric sheet 420 are bent and deformed, electric polarization is generated inside them, thereby forming an electric potential difference on the surface of the material. By connecting to an external circuit, current can be generated, thereby achieving power generation.

[0028] In some embodiments, as Figure 3 As shown, a mounting seat is welded to the inner bottom wall of the first housing 110, and the first piezoelectric piece 410 is interference-fitted with the mounting seat on the first housing 110 to achieve a mounting connection with the first housing 110. A mounting seat is welded to the inner top wall of the second housing 120, and the second piezoelectric piece 420 is interference-fitted with the mounting seat on the second housing 120 to achieve a mounting connection with the second housing 120.

[0029] like Figure 2As shown, in some embodiments of the present application, the first housing 110 and the second housing 120 are both cylindrical structures with one end open and the other end closed. The openings of the first housing 110 and the second housing 120 face each other, and the second housing 120 is sleeved around the outer periphery of the first housing 110 to form a mounting cavity. The electromagnetic module is disposed in the mounting cavity. This prevents damage to the electromagnetic module and increases its service life.

[0030] like Figure 2 As shown, in some embodiments of the present application, the first friction layer 310 is fixedly disposed on the outer circumferential surface of the first housing 110, and the second friction layer 320 is fixedly disposed on the inner circumferential surface of the second housing 120. The second housing 120 is sleeved onto the first housing 110 so that the first friction layer 310 and the second friction layer 320 abut against each other to seal the mounting cavity. In this embodiment, the contact between the first friction layer 310 and the second friction layer 320 effectively prevents foreign objects from entering the mounting cavity formed by the first housing 110 and the second housing 120. Furthermore, the first friction layer 310 and the second friction layer 320 are disposed on the outer shell, which facilitates heat dissipation.

[0031] like Figure 2 As shown, in some embodiments of the present application, the first friction layer 310 is a fluorinated ethylene propylene film, and the second friction layer 320 is a copper foil film. The fluorinated ethylene propylene film has a very strong electronegativity and high electron affinity, and its work function differs significantly from that of copper, resulting in significant charge transfer upon contact between the two. Furthermore, the fluorinated ethylene propylene film has an extremely low surface energy and a low dynamic friction coefficient, resulting in low resistance when sliding against the copper foil.

[0032] In some embodiments of the present application, Figure 2 As shown, the friction module, the electromagnetic module, and the piezoelectric module are connected to the energy storage device via a control module. The control module is also connected to a sensor for monitoring the vibration frequency of the first shell 110 relative to the second shell 120. The control module is used to control the connection and disconnection of the energy storage device with the friction module, the electromagnetic module, and the piezoelectric module. In this embodiment, the sensor is a vibration sensor. The vibration sensor can convert the vibration of an object into an electrical signal and determine the vibration of the object by measuring the magnitude and frequency of the electrical signal, thereby obtaining the vibration frequency of the first shell 110 relative to the second shell 120. The energy storage module can be a battery, and the control module can be a single-chip microcomputer. The method of monitoring the vibration frequency by a sensor and controlling the on-off of the circuit is a prior art and will not be described in detail here.

[0033] In this embodiment, the control module controls the connection and disconnection between the wiping module, the electromagnetic module, the piezoelectric module and the energy storage module, thereby ensuring that the wiping module, the electromagnetic module and the piezoelectric module are disconnected from the energy storage device when the power generation power is low, thereby preventing low-power charging from damaging the energy storage device.

[0034] In some embodiments of the present application, the vibration frequency of the first housing 110 relative to the second housing 120 is 0Hz-3Hz, and the control module controls the friction module to be connected solely to the energy storage device; the vibration frequency of the first housing 110 relative to the second housing 120 is 3Hz-10Hz, and the control module controls the piezoelectric module to be connected solely to the energy storage device; and the vibration frequency of the first housing 110 relative to the second housing 120 is 10Hz-25Hz, and the control module controls the electromagnetic module to be connected solely to the energy storage device. In this embodiment, when the vibration frequencies of the first housing 110 relative to the second housing 120 are 0Hz-3Hz, 3Hz-10Hz, and 10Hz-25Hz, respectively, the friction module, piezoelectric module, and electromagnetic module each have a higher power generation capacity.

[0035] In some embodiments of the present application, the friction module mainly operates in the low-frequency band. During the movement, contact and separation movement occurs. The suspension displacement excitation z(t) drives the fluorinated ethylene propylene film and the copper electrode to generate relative movement:

[0036]

[0037] in: is the equivalent mass of the friction layer, which is the sum of the mass of the FEP film and the copper foil; is the viscous damping coefficient, which is taken as 0.15 N·s / m; is the elastic support stiffness, which is 50N / m; Electrostatic force , is the dielectric constant of vacuum, is the effective contact area between the copper foil and the fluorinated ethylene propylene film in the triboelectric part, is the time-varying voltage, is the real-time gap distance between the copper foil film and the fluorinated ethylene propylene film; External incentives.

[0038] During the operation of the friction module, charge transfer occurs, and the friction electrification and electrostatic induction coupling effect occurs:

[0039]

[0040] in: , is the time-varying capacitance, is the dielectric constant of vacuum, is the relative dielectric constant of the fluorinated ethylene propylene film, is the effective contact area between the copper foil and the fluorinated ethylene propylene film, is the static distance between the two friction layers when there is no vibration, is the real-time displacement of the suspension system; is the charge relaxation time, which is 0.1ms. is the amount of charge accumulated over time, is the time-varying voltage.

[0041] The output power of the friction module in this application is

[0042]

[0043] Among them, the efficiency factor About 35%-45%.

[0044] In some embodiments of the present application, the piezoelectric module mainly operates in the low-frequency band, and the equation for the repulsive force between the first magnet and the second magnet driving the bending of the piezoelectric piece is:

[0045]

[0046]

[0047] in: is the dynamic repulsive force between the first magnet and the second magnet, are the equivalent radii of the first and second magnets, is the remanence, take 1.4 T, is the vacuum permeability, is the real-time displacement of the suspension system, is the initial distance between the magnets, which is 5 mm. is the length of the first piezoelectric plate and the second piezoelectric plate, is the width of the first piezoelectric sheet and the second piezoelectric sheet, are the thicknesses of the first piezoelectric sheet and the second piezoelectric sheet, is the transverse strain of the first and second piezoelectric sheets, The length×width×thickness dimensions of the first piezoelectric sheet and the second piezoelectric sheet of the present application are all 50×15×0.2 mm.

[0048] The equivalent current source model of the first and second piezoelectric plates of the piezoelectric module is:

[0049]

[0050]

[0051] in: Outputting a time-varying current to the first piezoelectric plate and the second piezoelectric plate, The transverse strain of the first and second piezoelectric plates, is the width of the first piezoelectric sheet and the second piezoelectric sheet, is the length of the first piezoelectric plate and the second piezoelectric plate, is the output voltage of the first and second piezoelectric plates when there is no load, are the thicknesses of the first and second piezoelectric sheets, is the dielectric constant of the piezoelectric material.

[0052] Matching load power of piezoelectric module:

[0053]

[0054] in, is the vibration frequency of the first shell relative to the second shell, Electromechanical coupling coefficient, The mechanical quality factor is taken as 80, is the magnetic repulsion force, is the equivalent stiffness of the first and second piezoelectric plates, is the load resistance, is the equivalent capacitance of the first piezoelectric sheet and the second piezoelectric sheet;

[0055] In some embodiments of the present application, the electromagnetic part mainly operates in a high-frequency band, and the magnetic field generated by the electromagnetic part's power magnet is:

[0056]

[0057] in, is the magnetic field intensity distribution along the axial direction. Figure 2 The middle is the vertical direction, is the displacement coordinate along the axial direction, is the magnetic pole pitch, take 12 mm, is the peak magnetic flux density, which is 1.8 T.

[0058] The electromotive force generated by the relative motion of the coil and the generating magnet in the electromagnetic module:

[0059]

[0060] in, is the instantaneous electromotive force generated in the coil, is the number of turns of the coil, The average radius of the coil is 10 mm. is the peak magnetic density; is the suspension vibration speed.

[0061] Maximum load power of electromagnetic module:

[0062]

[0063] in, is the effective length of the coil, is the internal resistance, To obtain the vibration speed from the suspension vibration frequency, is the number of turns of the coil, The average radius of the coil is taken as, is the peak magnetic flux density.

[0064] This application adopts a three-way compound mechanism, and the total output power is:

[0065]

[0066] in, is the total power; is the vibration frequency of the first shell relative to the second shell; is the output power of the friction module, given by After Fourier transform, we get: is the matching load power of the piezoelectric module, After Fourier transform, we get: is the load power of the electromagnetic module, Obtained through Fourier transform.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A vibration energy harvesting device for an automobile suspension system, characterized in that: It includes a shell, a friction module, an electromagnetic module and an energy storage device for storing the electrical energy generated by the friction module and the electromagnetic module; the shell includes a first shell and a second shell slidably arranged on the first shell, the electromagnetic module includes a power-generating magnet arranged on the first shell and a coil arranged on the second shell, and the second shell moves relative to the first shell to enable the power-generating magnet to move in the coil; the friction module includes a first friction layer fixed on the first shell, and a second friction layer fixed on the second shell, the first friction layer abuts against the second friction layer, and the second shell moves relative to the first shell to enable the first friction layer and the second friction layer to generate electricity by friction.

2. The automobile suspension system vibration energy harvesting device according to claim 1, characterized in that: It also includes a piezoelectric module connected to the shell. The second shell slides relative to the first shell, so that the piezoelectric module produces a piezoelectric effect and generates electrical energy.

3. The automobile suspension system vibration energy harvesting device according to claim 2, characterized in that: The piezoelectric module includes a first piezoelectric sheet and a second piezoelectric sheet, one end of the first piezoelectric sheet is fixed to the first shell, one end of the second piezoelectric sheet is fixed to the second shell, the other end of the first piezoelectric sheet is provided with a first magnet, and the other end of the second piezoelectric sheet is provided with a second magnet, the first magnet and the second magnet cooperate to generate a repulsive force to bend the first piezoelectric sheet and the second piezoelectric sheet, and the second shell slides relative to the first shell to align or deviate the first magnet and the second magnet.

4. The automobile suspension system vibration energy harvesting device according to claim 1, characterized in that: The first shell and the second shell are both cylindrical structures with one end open and the other end closed. The openings of the first shell and the second shell are opposite to each other. The second shell is sleeved on the outer periphery of the first shell to form an installation cavity. The electromagnetic module is arranged in the installation cavity.

5. The automobile suspension system vibration energy harvesting device according to claim 4, characterized in that: The first friction layer is fixedly arranged on the outer circumference of the first shell, the second friction layer is fixedly arranged on the inner circumference of the second shell, and the second shell is sleeved on the first shell so that the first friction layer and the second friction layer abut against each other to close the installation cavity.

6. The automobile suspension system vibration energy harvesting device according to claim 5, characterized in that: The first friction layer is a fluorinated ethylene propylene film, and the second friction layer is a copper foil film.

7. The automobile suspension system vibration energy harvesting device according to claim 2, characterized in that: The friction module, the electromagnetic module and the piezoelectric module are connected to the energy storage device through a control module. The control module is also connected to a sensor for monitoring the vibration frequency of the first shell relative to the second shell. The control module is used to control the connection and disconnection of the energy storage device and the friction module, the electromagnetic module and the piezoelectric module.

8. The automobile suspension system vibration energy harvesting device according to claim 7, characterized in that: When the vibration frequency of the first shell relative to the second shell is 0Hz-3Hz, the control module controls the friction module to be connected to the energy storage device alone; when the vibration frequency of the first shell relative to the second shell is 3Hz-10Hz, the control module controls the piezoelectric module to be connected to the energy storage device alone; when the vibration frequency of the first shell relative to the second shell is 10Hz-25Hz, the control module controls the electromagnetic module to be connected to the energy storage device alone.

Images