Piezoelectric collection system capable of recycling inertial energy of vehicle

Abstract

The invention discloses a piezoelectric collection system capable of recovering vehicle inertial energy, and belongs to the field of vehicle-mounted energy recovery. Inertial energy generated in the running process of a vehicle is captured through the energy capturing module and converted into swing of the mass ball; kinetic energy of the mass ball is converted into rotating kinetic energy of the rotor through the motion transmission module, and meanwhile one-way output and acceleration of the rotating speed of the rotor are achieved. The unidirectional rotation kinetic energy of the rotor is converted into electric energy through the energy conversion module; the energy storage module can effectively store the electric energy so as to supply the electric energy to the wireless sensor. The overall output power characteristics of the system are analyzed through tests, and the result shows that the system can provide an effective and feasible reference scheme for achieving the vehicle-mounted wireless sensor self-powered technology by recycling vehicle inertial energy. Compared with the prior art, the device has the advantages of high energy conversion efficiency, convenience in installation, compact structure, wide application range and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of inertial energy recovery, and in particular to a piezoelectric collection system capable of recovering vehicle inertial energy. Background Art

[0002] With the development of communication technology, the era of in-vehicle Internet of Things has arrived. In this context, sensor technology is particularly important, which is specifically divided into two categories: wired connection and wireless transmission. Compared with wired sensors, wireless sensors have the advantage of flexibility and are not limited to the installation environment. However, wireless sensors usually need their own power supply that needs to be replaced regularly, and the working time is limited by the power supply capacity. Collecting energy in the sensor working environment to realize the self-powering function of wireless sensors has become a widespread concern in the research field.

[0003] Current vehicle self-powered sensors can be divided into two categories based on energy sources: environmental energy and on-board energy. Environmental energy includes wind energy and solar energy. On-board energy is the energy generated by vehicle movement, including vibration energy, inertial kinetic energy, waste heat, tire kinetic energy and braking kinetic energy. In the natural environment, environmental energy collection is easily affected by the natural environment, solar energy collection is limited by weather conditions, and wind energy collection is affected by the installation location. In terms of on-board energy collection, research on recycling suspension vibration, tire movement and waste heat has received widespread attention, especially the collection of vehicle inertial energy. Vehicle inertia has rich collection potential. By collecting vehicle inertia, the energy supply of wireless sensors can be effectively guaranteed, but the collection efficiency and power of existing inertial energy collection devices are poor. In response to the above problems, the present invention proposes a piezoelectric collection system that can recover vehicle inertial energy. Summary of the invention

[0004] The purpose of the present invention is to provide a piezoelectric collection system that can recover vehicle inertial energy to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the present invention provides a piezoelectric collection system capable of recovering vehicle inertial energy, comprising:

[0006] An energy capture module, wherein the energy capture module is used to capture the inertial energy generated during the vehicle's driving process and convert the inertial energy into kinetic energy;

[0007] A motion transmission module, which is used to transmit the kinetic energy converted by the energy capture module and change the output mode of the kinetic energy;

[0008] An energy conversion module, the energy conversion module is used to convert the kinetic energy transmitted by the motion transmission module into electrical energy;

[0009] An energy storage module, wherein the energy storage module is used to store and release the electric energy generated by the energy conversion module.

[0010] Preferably, the energy capture module includes a mass ball, a ring gear, an upper center shaft and a bearing; the mass ball and the ring gear are detachably connected, the ring gear is limitably connected to the upper center shaft through a spline, the bearing is installed at the bottom of the upper center shaft, and the ring gear is rotatably matched with the motion transmission module through the upper center shaft and the bearing.

[0011] Preferably, the motion transmission module includes a shell, a cover plate, a one-way output mechanism and a speed increasing mechanism; the cover plate is detachably mounted on the top end of the shell, the upper center shaft is connected to the middle of the top end of the cover plate through a limited rotation of the bearing, and the bottom end of the gear ring is clearance-matched with the top end of the cover plate; the one-way output mechanism is arranged in three groups along the circumference of the cover plate, each group of the one-way output mechanism is meshed with the gear ring, and the bottom end of the one-way output mechanism is transmission-matched with the speed increasing mechanism.

[0012] Preferably, each group of the one-way output mechanism includes a large gear 1 and a large gear 2 arranged above the cover plate, and a medium gear 1, a medium gear 2, a small gear, a one-way bearing 1, a one-way bearing 2, a bearing 2 and a bearing 3 arranged below the cover plate; the large gear 1 is internally meshed with the gear ring, and the large gear 2 is externally meshed with the large gear 1; the one-way bearing 2 is coaxially arranged with the large gear 2, and the medium gear 2 is sleeved and installed on the outside of the one-way bearing 2; the one-way bearing 1 is coaxially arranged with the large gear, and the medium gear is sleeved and installed on the outside of the one-way bearing 1; the medium gear 1 and the medium gear 2 are both externally meshed with the small gear, and the bottom end of the small gear is transmission-matched with the speed increasing mechanism.

[0013] Preferably, the speed increasing mechanism includes planetary gears, a sun gear, a lower center shaft and bearing four; the lower center shaft is rotatably connected to the middle part of the shell through bearing four, the top end of the lower center shaft is limitedly connected to the sun gear through a spline, three planetary gears are arranged along the circumference of the sun gear, and the planetary gears are meshed with the outside of the sun gear, the planetary gears are limitedly connected to the pinion through a spline, and the bottom end of the lower center shaft is transmission-matched with the energy conversion module.

[0014] Preferably, the energy conversion module includes a rotor, a magnet one, a magnet two, a piezoelectric unit, a bracket, a one-way bearing three and a base plate; the bottom end of the shell is detachably mounted on the top end of the base plate, the rotor is rotatably connected to the middle part of the base plate through the one-way bearing three, and the bottom end of the lower center shaft is transmission-connected to the rotor; the outer cylindrical surface of the rotor is provided with a plurality of grooves, the magnet one is embedded in the grooves, and the magnetic poles of two adjacent magnets one are arranged in an alternating manner; the bracket is detachably mounted on the top end of the base plate, and a plurality of the brackets are arranged along the circumference of the base plate, the piezoelectric unit is fixedly connected to a side of the bracket close to the rotor, the magnet two is fixedly connected to the middle part of the piezoelectric unit, and the energy storage module is used to store the electric energy generated by the piezoelectric unit.

[0015] Preferably, a plurality of slide grooves are provided at the top of the bottom plate, the slide grooves are arranged in one-to-one correspondence with the brackets, and the slide grooves are arranged along the radial direction of the bottom plate, and the brackets are slidably installed in the slide grooves.

[0016] Preferably, the energy storage module is capable of rectifying, filtering and stabilizing the electric energy generated by the piezoelectric unit, and storing and releasing the electric energy.

[0017] A modeling method for an energy capture module. When the vehicle is accelerating or decelerating, the acceleration is The mass ball swings back and forth, and the gear ring rotates to generate angular acceleration The rotor is driven to rotate through the motion transmission module, and the system balance equation is established:

[0018]

[0019] Where T is the external torque and J is the moment of inertia of the system.

[0020]

[0021] Wherein, m is the mass of the mass ball, l0 is the distance between the center of the mass ball and the center of the gear ring, and θ0(t) is the rotation angle of the gear ring.

[0022]

[0023] Among them, T1 is the equivalent torque of each component of the system, T2 is the gear meshing damping torque of the system, and T3 is the magnet torque generated by the interaction force between magnet 1 on the rotor and magnet 2 on the piezoelectric unit during the rotation of the rotor.

[0024]

[0025] Among them, J0 is the moment of inertia of the mass ball and the gear ring; J1, J2, J3, J4, J5, J6, and J7 are the moments of inertia of large gear 1, large gear 2, medium gear 1, medium gear 2, small gear, planetary gear, and sun gear respectively; J e is the moment of inertia of the rotor.

[0026]

[0027] The gear meshing damping torque of the system is:

[0028]

[0029] Among them, C mr , C m1 , C m3 , C m6 They are the meshing damping coefficient between the ring gear and large gear one, the meshing damping coefficient between large gear one and large gear two, the meshing damping coefficient between medium gear one and small gear, and the meshing damping coefficient between the planetary gear and the sun gear.

[0030] C ms =C mr +C m1 +2×C m3 +C m6

[0031] The magnet torque is:

[0032]

[0033] Among them, C e is the magnetic damping coefficient of the system. r , z1, z3, z5, z6, z7 are the numbers of teeth of the ring gear, large gear 1, medium gear 1, pinion gear, planetary gear and sun gear.

[0034]

[0035] The system dynamics equation is:

[0036]

[0037] Compared with the prior art, the present invention has the following advantages and technical effects:

[0038] 1. The present invention is designed based on the characteristics of vehicle speed change, the characteristics of magnetic interaction between magnets and the power generation characteristics of piezoelectric units. It has the characteristics of convenient installation, reliable operation, high recovery efficiency, strong applicability and easy promotion and application.

[0039] 2. The present invention adopts the form of mass ball pendulum motion to effectively convert the vehicle inertial energy into the kinetic energy of the mass ball in the horizontal direction, thereby realizing the efficient capture of inertial energy. Through the unidirectional output and speed-increasing mechanism, the captured energy is output in the form of rapid unidirectional rotation of the rotor, thereby improving the energy recovery efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 This is a schematic diagram of the structure of a piezoelectric collection system capable of recovering vehicle inertial energy according to the present invention;

[0042] Figure 2 This is a schematic diagram of the structure of the energy capture module of the present invention;

[0043] Figure 3 It is a schematic diagram of the structure of the motion transmission module of the present invention;

[0044] Figure 4 This is a schematic diagram of the principle of the one-way output mechanism of the present invention;

[0045] Figure 5 It is a schematic diagram of the speed increasing mechanism of the present invention;

[0046] Figure 6 This is a schematic diagram of the structure of the energy conversion module of the present invention;

[0047] Figure 7 It is a kinetic energy input model in an embodiment of the present invention;

[0048] Figure 8 Four historical operating conditions of buses in the embodiment of the present invention;

[0049] Fig. 9 Angular velocity curves of the rotor under four working conditions in the embodiment of the present invention;

[0050] Fig.10 The magnetic force model of the magnet in the embodiment of the present invention;

[0051] Fig.11 Schematic diagram of three magnet arrangements in an embodiment of the present invention;

[0052] Fig.12 These are four historical operating conditions of buses in the embodiment of the present invention;

[0053] Fig.13 is a graph of the angular velocity of a mass ball in an embodiment of the present invention;

[0054] Fig.14 It is a voltage curve diagram of 12 system combinations under working condition 2 in an embodiment of the present invention;

[0055] Fig.15 It is a voltage curve diagram of 12 system combinations under working condition 3 in an embodiment of the present invention;

[0056] In the figure: Ⅰ, energy capture module; Ⅱ, motion transmission module; Ⅲ, energy conversion module; 1, mass ball; 2, gear ring; 3, upper center shaft; 4, bearing one; 5, cover plate; 6, large gear one; 7, bearing two; 8, large gear two; 9, one-way bearing two; 10, middle gear two; 11, small gear; 12, middle gear one; 13, one-way bearing one; 14, bearing three; 15, lower center shaft; 16, planetary gear; 17, housing; 18, sun gear; 19, bearing four; 20, rotor; 21, one-way bearing three; 22, magnet one; 23, bottom plate; 24, bracket; 25, magnet two; 26, piezoelectric unit. DETAILED DESCRIPTION

[0057] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0058] like Figure 1 As shown, the present invention provides a piezoelectric collection system capable of recovering vehicle inertial energy, comprising:

[0059] Energy capture module I: Energy capture module I is used to capture the inertial energy generated during vehicle driving and convert the inertial energy into kinetic energy;

[0060] Motion transmission module II, which is used to transmit the kinetic energy converted by energy capture module I and change the output mode of the kinetic energy;

[0061] Energy conversion module III, energy conversion module III is used to convert the kinetic energy transmitted by the motion transmission module II into electrical energy;

[0062] Energy storage module, the energy storage module is used to store and release the electrical energy generated by the energy conversion module III.

[0063] Further optimization scheme, such as Figure 2As shown, the energy capture module I includes a mass ball 1, a gear ring 2, an upper center shaft 3 and a bearing 1 4; the mass ball 1 and the gear ring 2 are detachably connected, the gear ring 2 is limitedly connected to the upper center shaft 3 through a spline, the bearing 1 4 is sleeved and installed at the bottom of the upper center shaft 3, and the gear ring 2 is rotationally matched with the motion transmission module II through the upper center shaft 3 and the bearing 1 4.

[0064] The energy capture module I is similar to a simple pendulum device, which realizes the conversion of the vehicle's inertial energy into the kinetic energy of the mass ball 1 through the simple pendulum motion of the mass ball 1, thereby realizing the capture of the inertial energy.

[0065] Further optimization scheme, such as Figures 3 to 5 As shown, the motion transmission module II includes a housing 17, a cover plate 5, a one-way output mechanism and a speed increasing mechanism; the cover plate 5 is detachably mounted on the top end of the housing 17, the upper central shaft 3 is rotationally connected to the middle of the top end of the cover plate 5 through a bearing 1 4, and the bottom end of the ring gear 2 is clearance-matched with the top end of the cover plate 5; three groups of one-way output mechanisms are arranged along the circumference of the cover plate 5, each group of one-way output mechanisms is meshed with the ring gear 2, and the bottom end of the one-way output mechanism is transmission-matched with the speed increasing mechanism.

[0066] Each set of one-way output mechanisms includes a large gear 1 6 and a large gear 2 8 arranged above the cover plate 5, and a medium gear 1 12, a medium gear 2 10, a small gear 11, a one-way bearing 1 13, a one-way bearing 2 9, a bearing 2 7 and a bearing 3 14 arranged below the cover plate 5; the large gear 1 6 is internally meshed with the gear ring 2, and the large gear 2 8 is externally meshed with the large gear 1 6; the one-way bearing 2 9 is coaxially arranged with the large gear 2 8, and the medium gear 2 10 is sleeved and installed on the outer side of the one-way bearing 2 9; the one-way bearing 13 is coaxially arranged with the large gear 1 6, and the medium gear 1 12 is sleeved and installed on the outer side of the one-way bearing 1 13; the medium gear 1 12 and the medium gear 2 10 are both externally meshed with the small gear 11, and the bottom end of the small gear 11 is transmission-matched with the speed increasing mechanism.

[0067] The speed increasing mechanism comprises planetary gears 16, a sun gear 18, a lower center shaft 15 and bearing four 19; the lower center shaft 15 is rotatably connected to the middle part of the housing 17 through bearing four 19, the top end of the lower center shaft 15 is limitedly connected to the sun gear 18 through a spline, three planetary gears 16 are arranged along the circumference of the sun gear 18, and the planetary gears 16 are externally meshed with the sun gear 18, the planetary gears 16 are limitedly connected to the pinion 11 through a spline, and the bottom end of the lower center shaft 15 is transmission-matched with the energy conversion module III.

[0068] One-way output mechanism: When the mass ball 1 drives the gear ring 2 to rotate counterclockwise, the large gear 16 meshes with the inner part of the gear ring 2, and the gear ring 2 drives the large gear 16 to rotate counterclockwise, and the large gear 28 meshes with the outer part of the large gear 16, so it rotates clockwise. The middle gear 12 and the middle gear 2 10 are respectively built with a one-way bearing 13 and a one-way bearing 29. At this time, the one-way bearing 13 is in a disconnected state, the one-way bearing 29 is in a coupled state, and the middle gear 2 10 rotates clockwise following the large gear 2 8. The small gear 11 rotates counterclockwise by meshing with the outer part of the middle gear 2 10. At this time, the middle gear 12 rotates clockwise due to the outer meshing with the small gear 11. When the mass ball 1 drives the gear ring 2 to rotate clockwise, the large gear 16 meshes with the inner part of the gear ring 2, and the gear ring 2 drives the large gear 16 to rotate clockwise, and the large gear 28 meshes with the outer part of the large gear 16, so it rotates counterclockwise. The middle gear 12 and the middle gear 2 10 are respectively built with one-way bearing 13 and one-way bearing 2 9. At this time, the one-way bearing 13 is in a coupled state, the one-way bearing 2 9 is in a disconnected state, and the middle gear 12 rotates clockwise following the large gear 1 6. The small gear 11 rotates counterclockwise by external meshing with the middle gear 12. At this time, the middle gear 2 10 rotates clockwise due to external meshing with the small gear 11.

[0069] The speed increasing mechanism includes: the planetary gear 16 is connected to the pinion gear 11 through a spline, the three planetary gears 16 are simultaneously meshed with the sun gear 18, the lower center shaft 15 is connected to the sun gear 18 through a spline, and the lower center shaft 15 and the bearing 19 are installed on the housing 17. When the pinion gear 11 rotates, the planetary gear 16 is driven to rotate, and the sun gear 18 realizes the speed increasing output.

[0070] Further optimization scheme, such as Figure 6 As shown, the energy conversion module III includes a rotor 20, a magnet 1 22, a magnet 25, a piezoelectric unit 26, a bracket 24, a one-way bearing 3 21 and a base plate 23; the bottom end of the shell 17 is detachably mounted on the top of the base plate 23, the rotor 20 is rotatably connected to the middle of the base plate 23 through the one-way bearing 3 21, and the bottom end of the lower center shaft 15 is transmission-connected to the rotor 20; the outer cylindrical surface of the rotor 20 is provided with a plurality of grooves, the magnet 1 22 is embedded in the grooves, and the magnetic poles of two adjacent magnets 1 22 are arranged in an alternating manner; the bracket 24 is detachably mounted on the top of the base plate 23, and a plurality of brackets 24 are arranged along the circumference of the base plate 23, the piezoelectric unit 26 is fixedly connected to one side of the bracket 24 close to the rotor 20, the magnet 25 is fixedly connected to the middle of the piezoelectric unit 26, and the energy storage module is used to store the electric energy generated by the piezoelectric unit 26.

[0071] The sun gear 18 of the motion transmission module II drives the rotor 20 to rotate through the lower central shaft 15. The magnet 1 22 on the rotor 20 and the magnet 2 25 fixed on the piezoelectric unit 26 generate an interactive magnetic force, and the piezoelectric unit 26 bends and deforms to output electrical energy.

[0072] According to a further optimization scheme, a plurality of slide grooves are provided at the top of the bottom plate 23, the slide grooves are arranged in one-to-one correspondence with the brackets 24, and the slide grooves are arranged along the radial direction of the bottom plate 23, and the brackets 24 are slidably installed in the slide grooves.

[0073] The piezoelectric unit 26 is fixed on the bottom plate guide rail through the bracket 24 . By adjusting the position of the bracket 24 in the slide slot, the distance from the piezoelectric unit 26 to the center of the rotor 20 can be adjusted.

[0074] According to a further optimization scheme, the energy storage module can rectify, filter and stabilize the electric energy generated by the piezoelectric unit 26, and store and release the electric energy.

[0075] Example

[0076] The piezoelectric collection system for recovering vehicle inertial energy provided by the present invention has the advantages of high energy conversion efficiency, convenient installation, compact structure and wide application range. Therefore, the present invention is applied to buses and installed on the bus chassis to achieve effective recovery of inertial energy, thereby realizing the self-powered function of wireless sensors. The specific analysis process is as follows:

[0077] 1. Kinetic energy input model analysis

[0078] like Figure 7 As shown, when the vehicle is accelerating or decelerating, the acceleration is The mass ball 1 swings back and forth, and the gear ring 2 rotates to generate angular acceleration The rotor 20 is driven to rotate by the motion transmission module, and the system balance equation is established:

[0079]

[0080] Where T is the external torque and J is the moment of inertia of the system. Figure 7 As shown, during the swing of mass ball 1, the external torque can be calculated as:

[0081]

[0082] Among them, m is the mass of mass ball 1, l0 is the distance between the center of mass ball 1 and the center of gear ring 2, and θ0(t) is the rotation angle of gear ring 2. External torque is mainly used for three parts:

[0083]

[0084] T1 is the equivalent torque of each component of the system, T2 is the gear meshing damping torque of the system, and T3 is the magnet torque generated by the interaction force between the magnet 1 22 on the rotor 20 and the magnet 2 25 on the piezoelectric unit 26 during the rotation of the rotor 20.

[0085]

[0086] Among them, J0 is the moment of inertia of mass ball 1 and gear ring 2; J1, J2, J3, J4, J5, J6, and J7 are the moments of inertia of large gear 1 6, large gear 2 8, medium gear 1 12, medium gear 2 10, small gear 11, planetary gear 16, and sun gear 18 respectively; J e is the moment of inertia of the rotor 20 .

[0087]

[0088] The gear meshing damping torque of the system is:

[0089]

[0090] Among them, C mr , C m1 , C m3 , C m6 They are respectively the meshing damping coefficient between the ring gear 2 and the large gear 1 6 , the meshing damping coefficient between the large gear 1 6 and the large gear 2 8 , the meshing damping coefficient between the middle gear 12 and the pinion 11 , and the meshing damping coefficient between the planetary gear 16 and the sun gear 18 .

[0091] C ms =C mr +C m1 +2×C m3 +C m6 (7)

[0092] The magnet torque is:

[0093]

[0094] Among them, C e is the magnetic damping coefficient of the system. r , z1, z3, z5, z6, z7 are the numbers of teeth of the ring gear 2, large gear 16, medium gear 12, small gear 11, planetary gear 16 and sun gear 18.

[0095]

[0096] The system dynamics equation is:

[0097]

[0098] Figure 8 are four real historical operating conditions of the bus. Combined with formula (10), a MATLAB / Simulink model is built to obtain the rotation characteristics of the rotor 20 under the four operating conditions, as shown in Fig. 9 As shown in the figure, it can be seen that the greater the change in vehicle speed, the greater the angular velocity of the rotor 20 is, which is consistent with the actual situation.

[0099] 2. Magnet magnetic force model analysis

[0100] Magnet 1 22 is distributed on the rotor 20 and is marked as A, and magnet 2 25 is fixed on the piezoelectric unit 26 and is marked as B. Fig.10 As shown, a magnetic force model between magnets A and B is established.

[0101]

[0102] Where, μ0—vacuum magnetic permeability; J N , J—magnetization intensity of magnets A and B; —A function of magnet size and gap. Depending on the positional relationship of the two magnets, the values ​​of m, n, u, l, p, and q are 0 or 1 respectively.

[0103]

[0104] in, and r N It can be calculated as:

[0105]

[0106] Among them, L N , W N , H N - length, width and height of magnet A fixed on rotor 20; L, W, H - length, width and height of magnet B fixed on piezoelectric unit 26; - Magnet A fixed to the rotor 20 and magnet B fixed to the piezoelectric unit 26 and the perpendicular projection distances in the Cartesian coordinate system x, y and z directions.

[0107] The magnet A fixed on the rotor 20 and the magnet B fixed on the piezoelectric unit 26 are located in the xy plane, so the vertical projection distance between the magnet A and the magnet B can be expressed as:

[0108]

[0109] Among them, r m - the radius of gyration of the magnet A fixed on the rotor 20; —The initial distance between magnet A and magnet B in the x direction; x(t) —The displacement of magnet B; —angle change of magnet A at the initial position; q—number of magnets A.

[0110]

[0111] 3. Analysis of test results

[0112] In order to more realistically explore the output voltage characteristics of the system, four real intercity bus operating conditions are selected for analysis. The distribution of magnets 22 on the rotor 20 and the distance between magnets 22 and 25 are adjusted to explore their influence on the output voltage characteristics. The number of magnets 22 on the rotor 20 is 12, 6, and 4, and the distance is set to 9mm, 12mm, 15mm, and 18mm, with a total of 12 combinations (3 magnet arrangement methods and 4 distances). Fig.11 Schematic diagram of three arrangements of magnets on the rotor 20.

[0113] Fig.12 For the four historical operating conditions of buses, the changes in the angular velocity of mass ball 1 under four real operating conditions are obtained through MATLAB / Simulink, such as Fig.13 In order to evaluate the performance of the inertial energy piezoelectric harvesting system, a test prototype was made and a test platform was constructed.

[0114] Selecting an external load of 15kΩ, the voltage output of the system under 12 combinations is analyzed under working conditions 2 and 4. The results are as follows: Fig.14 and Fig.15 As shown in the figure, comparative analysis found that: under the two working conditions, the system output voltage change trend and voltage amplitude showed similar rules. The amplitude of the output voltage decreased with the increase of the distance between the two magnets, and increased with the increase of the number of magnets, indicating that the inertial energy piezoelectric harvesting system has significant stability and applicability.

[0115] The present invention analyzes the overall output power characteristics of the system through experiments. The results show that the system can recover the vehicle inertia energy and provide an effective and feasible reference solution for realizing the self-powering technology of vehicle-mounted wireless sensors. It has the advantages of high energy conversion efficiency, convenient installation, compact structure and wide application range.

[0116] The above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A piezoelectric collection system capable of recovering vehicle inertial energy, characterized in that: include: An energy capture module (I), wherein the energy capture module (I) is used to capture the inertial energy generated during the vehicle's driving process and convert the inertial energy into kinetic energy; A motion transmission module (II), the motion transmission module (II) is used to transmit the kinetic energy converted by the energy capture module (I) and change the output mode of the kinetic energy; An energy conversion module (III), wherein the energy conversion module (III) is used to convert the kinetic energy transmitted by the motion transmission module (II) into electrical energy; An energy storage module, wherein the energy storage module is used to store and release the electric energy generated by the energy conversion module (III).

2. The piezoelectric collection system for recovering vehicle inertial energy according to claim 1, characterized in that: The energy capture module (I) comprises a mass ball (1), a gear ring (2), an upper center shaft (3) and a bearing one (4); the mass ball (1) and the gear ring (2) are detachably connected, the gear ring (2) is limitedly connected to the upper center shaft (3) through a spline, the bearing one (4) is sleeved and installed at the bottom of the upper center shaft (3), and the gear ring (2) is rotationally matched with the motion transmission module (II) through the upper center shaft (3) and the bearing one (4).

3. The piezoelectric collection system for recovering vehicle inertial energy according to claim 2, characterized in that: The motion transmission module (II) comprises a housing (17), a cover plate (5), a one-way output mechanism and a speed increasing mechanism; the cover plate (5) is detachably mounted on the top end of the housing (17); the upper central shaft (3) is rotationally connected to the middle of the top end of the cover plate (5) via the bearing 1 (4); the bottom end of the gear ring (2) is clearance-matched with the top end of the cover plate (5); three groups of one-way output mechanisms are arranged along the circumference of the cover plate (5); each group of one-way output mechanisms is meshed with the gear ring (2); and the bottom end of the one-way output mechanism is transmission-matched with the speed increasing mechanism.

4. The piezoelectric collection system for recovering vehicle inertial energy according to claim 3, characterized in that: Each set of the one-way output mechanism comprises a large gear 1 (6) and a large gear 2 (8) arranged above the cover plate (5), and a middle gear 1 (12), a middle gear 2 (10), a small gear (11), a one-way bearing 1 (13), a one-way bearing 2 (9), a bearing 2 (7) and a bearing 3 (14) arranged below the cover plate (5); the large gear 1 (6) is internally meshed with the gear ring (2), and the large gear 2 (8) is externally meshed with the large gear 1 (6); the one-way output mechanism comprises a plurality of gears, each of which is provided with ... The bearing 2 (9) is coaxially arranged with the large gear 2 (8), and the middle gear 2 (10) is sleeved and installed on the outer side of the one-way bearing 2 (9); the one-way bearing 1 (13) is coaxially arranged with the large gear 1 (6), and the middle gear 1 (12) is sleeved and installed on the outer side of the one-way bearing 1 (13); the middle gear 1 (12) and the middle gear 2 (10) are both externally meshed with the pinion gear (11), and the bottom end of the pinion gear (11) is transmission-matched with the speed increasing mechanism.

5. The piezoelectric collection system for recovering vehicle inertial energy according to claim 4, characterized in that: The speed increasing mechanism comprises a planetary gear (16), a sun gear (18), a lower center shaft (15) and a bearing four (19); the lower center shaft (15) is rotatably connected to the middle part of the housing (17) through the bearing four (19); the top end of the lower center shaft (15) is connected to the sun gear (18) through a spline limiter; three planetary gears (16) are arranged along the circumference of the sun gear (18); the planetary gears (16) are externally meshed with the sun gear (18); the planetary gears (16) are connected to the pinion (11) through a spline limiter; and the bottom end of the lower center shaft (15) is transmission-matched with the energy conversion module (III).

6. The piezoelectric collection system for recovering vehicle inertial energy according to claim 5, characterized in that: The energy conversion module (III) comprises a rotor (20), a magnet 1 (22), a magnet 2 (25), a piezoelectric unit (26), a bracket (24), a one-way bearing 3 (21) and a base plate (23); the bottom end of the housing (17) is detachably mounted on the top end of the base plate (23); the rotor (20) is rotatably connected to the middle part of the base plate (23) through the one-way bearing 3 (21); the bottom end of the lower center shaft (15) is transmission-connected to the rotor (20); the outer cylindrical surface of the rotor (20) is provided with a plurality of grooves. The magnet one (22) is embedded in the groove, and the magnetic poles of two adjacent magnets one (22) are arranged in a staggered manner; the bracket (24) is detachably mounted on the top of the base plate (23), and a plurality of brackets (24) are arranged along the circumference of the base plate (23); the piezoelectric unit (26) is fixedly connected to a side of the bracket (24) close to the rotor (20); the magnet two (25) is fixedly connected to the middle of the piezoelectric unit (26); and the energy storage module is used to store the electric energy generated by the piezoelectric unit (26).

7. The piezoelectric collection system for recovering vehicle inertial energy according to claim 6, characterized in that: A plurality of slide grooves are provided at the top of the bottom plate (23), the slide grooves are arranged in one-to-one correspondence with the brackets (24), and the slide grooves are arranged along the radial direction of the bottom plate (23), and the brackets (24) are slidably installed in the slide grooves.

8. The piezoelectric collection system for recovering vehicle inertial energy according to claim 6, characterized in that: The energy storage module is capable of rectifying, filtering and stabilizing the electric energy generated by the piezoelectric unit (26), and storing and releasing the electric energy.

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