Tire monitoring module

Abstract

The utility model discloses a tire monitoring module. The tire monitoring module comprises a sensor unit and a fixing unit. One side of the fixing unit is installed on the inner side of a tire, the fixing unit is provided with a first containing cavity, the sensor unit can be detachably contained in the first containing cavity, a piezoelectric assembly is integrated in the fixing unit, and the piezoelectric assembly is electrically connected with the sensor unit and transmits generated alternating current to the sensor unit. The piezoelectric assembly is integrated into the fixing unit to supply power to the sensor unit, the internal structural design of the sensor unit is simplified while power supply is guaranteed, the sensor unit can be detachably installed in the first containing cavity of the fixing unit, and disassembly, assembly and maintenance of the sensor unit are facilitated.

Description

Technical Field

[0001] This application relates to the technical field of intelligent tires, and particularly to a tire monitoring module. Background Art

[0002] An intelligent tire refers to a tire monitoring module installed or embedded inside the tire, which contains chips and sensors. The tire monitoring module can collect physical parameters such as temperature, pressure, wheel speed, and vehicle speed. These parameters can be used not only for tire monitoring / alarm but also provided to the Active Body Control (ABC) and Electronic Stability Program (ESP) of the vehicle body. Obviously, collecting and transmitting the above data immediately, continuously, and accurately will greatly improve the vehicle safety performance, which requires a reliable and continuous power supply inside the monitoring module.

[0003] In the prior art, the problem of continuous power supply is generally solved by installing a battery inside the monitoring module or integrating a piezoelectric unit internally. Among them, the working principle of the piezoelectric unit is to receive the impact from the ground and generate electrical energy through the piezoelectric effect. However, in the existing solutions, after the tire monitoring module is fixed to the inner side of the tire by bonding or hardening, it is difficult to remove and replace the sensors and power supply units encapsulated inside the tire monitoring module, which brings inconvenience to the disassembly, installation, and maintenance of the sensors or power supply units in the later stage. In addition, the power supply method of integrating the piezoelectric unit inside the tire monitoring module makes the structure of the sensor more complex and increases the difficulty of later maintenance. Summary of the Utility Model

[0004] This application aims to solve at least one of the above technical problems in the prior art to some extent. To this end, the first aspect embodiment of this application provides a tire monitoring module, which can meet the continuous working power supply while the internal sensor has a simple structure and is convenient for disassembly and assembly.

[0005] The tire monitoring module according to the first aspect embodiment of this application includes:

[0006] A sensor unit;

[0007] A fixing unit, one side of which is installed on the inner side of the tire. The fixing unit is provided with a first accommodation cavity, and the sensor unit can be detachably accommodated in the first accommodation cavity;

[0008] The fixing unit integrates a piezoelectric component, and the piezoelectric component is electrically connected to the sensor unit and transmits the generated alternating current to the sensor unit.

[0009] Based on the above technical solution, the first aspect embodiment of the present application has at least the following beneficial effects: The tire monitoring module is installed on the inner side of the tire through the fixing unit. The fixing unit is provided with a first accommodating cavity, and the sensor unit can be detachably accommodated in the first accommodating cavity. A piezoelectric component is integrated in the fixing unit. During the process of the tire rolling, the piezoelectric component is periodically compressed and deformed, thereby generating a continuous alternating current. The piezoelectric component is electrically connected to the sensor unit and transmits the generated alternating current to the sensor unit to continuously supply power for the operation of the sensor unit. In the present application, the piezoelectric component is integrated in the fixing unit, and the power supply for the sensor unit is realized by electrically connecting the piezoelectric component to the sensor unit, eliminating the design of the power supply module in the sensor unit, thereby simplifying the structure of the sensor unit. In addition, the sensor unit can be detachably installed in the first accommodating cavity of the fixing unit, facilitating the disassembly, installation and maintenance of the sensor unit.

[0010] According to the tire monitoring module of the first aspect embodiment of the present application, a first coil is built in the sensor unit, and a second coil is provided in the piezoelectric component. The alternating current generated by the piezoelectric component is transmitted to the sensor unit through the second coil and the first coil.

[0011] According to the tire monitoring module of the first aspect embodiment of the present application, the fixing unit further includes an upper cover and a chassis;

[0012] The bottom surface of the chassis is installed on the inner side of the tire;

[0013] The bottom surface of the upper cover is tightly attached to the top surface of the chassis and defines a second accommodating cavity for accommodating the piezoelectric component;

[0014] A protrusion away from the chassis is provided on the top surface of the upper cover, and the first accommodating cavity is provided in the protrusion.

[0015] According to the tire monitoring module of the first aspect embodiment of the present application, a first opening is provided on the bottom surface of the upper cover, and the first accommodating cavity is communicated with the first opening;

[0016] The sensor is further provided with a first contact and a second contact, and the sensor is electrically connected to the piezoelectric component through the first contact and the second contact.

[0017] According to the tire monitoring module of the first aspect embodiment of the present application, the piezoelectric component further includes a piezoelectric layer, an upper electrode and a lower electrode;

[0018] An opening is provided in the middle of the piezoelectric layer, and the second coil is located in the opening;

[0019] The upper electrode and the lower electrode are respectively tightly attached to the upper and lower surfaces of the piezoelectric layer;

[0020] The second coil is provided with two pins, which are electrically connected to the upper electrode and the lower electrode respectively.

[0021] For the tire monitoring module according to the embodiment of the first aspect of the present application, the piezoelectric component further includes a piezoelectric layer, an upper electrode and a lower electrode;

[0022] An opening is provided in the middle of the piezoelectric layer;

[0023] The upper electrode and the lower electrode are respectively closely attached to the upper and lower surfaces of the piezoelectric layer;

[0024] One end of both the upper electrode and the lower electrode protrudes from the opening.

[0025] For the tire monitoring module according to the embodiment of the first aspect of the present application, the piezoelectric component further includes a piezoelectric layer, an upper electrode and a lower electrode;

[0026] An opening is provided in the middle of the piezoelectric layer;

[0027] The upper electrode and the lower electrode are respectively closely attached to the upper and lower surfaces of the piezoelectric layer;

[0028] One end of both the upper electrode and the lower electrode protrudes from the opening.

[0029] For the tire monitoring module according to the embodiment of the first aspect of the present application, the encapsulation layer includes an upper encapsulation layer and a lower encapsulation layer. The outer diameter of the lower encapsulation layer is larger than that of the upper encapsulation layer. The lower encapsulation layer is provided with second grooves of different sizes along the axial direction on the surface that cooperates with and connects to the upper encapsulation layer, and is respectively used for accommodating the lower electrode, the piezoelectric layer and the upper encapsulation layer.

[0030] For the tire monitoring module according to the embodiment of the first aspect of the present application, the top surface of the chassis is provided with a first groove, and the second accommodation cavity is the space enclosed by the bottom surface of the upper cover and the first groove.

[0031] For the tire monitoring module according to the embodiment of the first aspect of the present application, the upper encapsulation layer is provided with a second opening, and the position of the second opening corresponds to the position of the opening.

[0032] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present application. Description of the Drawings

[0033] To more clearly illustrate the technical solutions in the embodiments of the present application, the accompanying drawings required for the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other accompanying drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 It is a schematic structural diagram of a tire monitoring module in the first aspect embodiment of the present application;

[0035] Figure 2 It is a schematic cross-sectional structural diagram of a tire monitoring module in the first aspect embodiment of the present application;

[0036] Figure 3 It is a schematic structural diagram of a fixing unit in the first aspect embodiment of the present application;

[0037] Figure 4 It is a schematic cross-sectional structural diagram of a fixing unit in the first aspect embodiment of the present application;

[0038] Figure 5 It is a disassembled schematic diagram of a fixing unit in the first aspect embodiment of the present application;

[0039] Figure 6 It is a schematic structural diagram of a chassis in the first aspect embodiment of the present application;

[0040] Figure 7 It is a schematic cross-sectional structural diagram of an upper cover in the first aspect embodiment of the present application;

[0041] Figure 8 It is Figure 10 an enlarged view of part A in

[0042] Figure 9 It is Figure 10 an enlarged view of part B in

[0043] Figure 10 It is a disassembled schematic diagram of a piezoelectric component in the first aspect embodiment of the present application;

[0044] Figure 11 It is a schematic diagram of the assembly relationship between the second coil, the piezoelectric layer, the upper electrode, and the lower electrode in the first aspect embodiment of the present application;

[0045] Figure 12 It is a schematic diagram of the assembly relationship between the piezoelectric layer, the lower electrode, and the second coil in the first aspect embodiment of the present application;

[0046] Figure 13 It is a schematic structural diagram of a sensor unit in the first aspect embodiment of the present application;

[0047] Figure 14Schematic cross-sectional structure diagram of the sensor unit in the first aspect embodiment of the present application;

[0048] Figure 15 Exploded view of the structure of the fixing unit in the second aspect embodiment of the present application;

[0049] Figure 16 Schematic cross-sectional structure diagram of the upper cover in the second aspect embodiment of the present application;

[0050] Figure 17 Schematic diagram of the disassembly of the piezoelectric component in the second aspect embodiment of the present application;

[0051] Figure 18 Schematic structure diagram of the sensor unit in the second aspect embodiment of the present application;

[0052] Reference numerals:

[0053] Sensor unit 100, first coil 110, first contact 120, second contact 130, fixing unit 200, first accommodation cavity 210, upper cover 220, protrusion 221, first mating portion 222, first opening 223, piezoelectric component 230, upper encapsulation layer 231, second opening 2311, upper electrode 232, piezoelectric layer 233, opening 2331, lower electrode 234, lower encapsulation layer 235, second groove 2351, second coil 236, pin 2361, chassis 240, first groove 241, second mating portion 242, inner side of the tire 300. Detailed implementation manners

[0054] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0055] In the present application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0056] Moreover, in addition to being used to represent orientation or positional relationships, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0057] In addition, the terms "installed", "set up", "provided with", "connected", "linked" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0058] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, components or parts (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, components or parts. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0059] The technical solution of this application will be further described below in conjunction with embodiments and drawings.

[0060] Refer to Figure 1 , in the embodiment of the first aspect of this application, a tire monitoring module is provided, which can meet the requirements of continuous working power supply while having a simple internal sensor structure and being convenient for disassembly and assembly.

[0061] See Figures 1 to 5 , the tire monitoring module includes a sensor unit 100 and a fixing unit 200. One side of the fixing unit 200 is installed on the inner side 300 of the tire. The fixing unit 200 is provided with a first accommodation cavity 210, and the sensor unit 100 can be detachably accommodated in the first accommodation cavity 210. A piezoelectric component 230 is integrated in the fixing unit 200. The piezoelectric component 230 is electrically connected to the sensor unit 100 and transmits the generated alternating current to the sensor unit 100.

[0062] As an example, in an embodiment of this application, the sensor unit 100 is internally provided with a first coil 110. A piezoelectric component 230 is integrated in the fixing unit 200. A second coil 236 is provided in the piezoelectric component 230. The alternating current generated by the piezoelectric component 230 is transmitted to the sensor unit 100 through the second coil 236 and the first coil 110.

[0063] First, the direct piezoelectric effect of the piezoelectric material is described as follows: When the piezoelectric material is subjected to stress, polarization occurs inside, charges move towards the stressed surface and concentrate at both ends, thus generating charges with equal amounts and opposite polarities; when the stress disappears, the piezoelectric material returns to its initial state and no charges accumulate at both ends. This is the direct piezoelectric effect of the piezoelectric material, and the amount of charge generated is proportional to the magnitude of the stress applied to the piezoelectric material and also to the piezoelectric coefficient of the material itself.

[0064] Secondly, the principle of generating an alternating current by the piezoelectric material is described: When pressure is applied to the piezoelectric material, a peak voltage will be generated instantaneously by the piezoelectric material, and then the voltage returns to zero. When the pressure is removed, a peak-valley voltage will be generated instantaneously at the moment of removal, and then the voltage returns to zero. It can be seen from this that only when the stress applied changes continuously can the piezoelectric material emit current, and this current can only be an alternating current.

[0065] Finally, the working process of generating an alternating current by the piezoelectric component 230 in this application is described: During the driving of the vehicle, the tire rotates at a certain speed. As the tire tread touches the ground, the fixing unit 200 installed on the inner side 300 of the tire receives the ground impact and transmits the impact to the piezoelectric component 230 integrated in the fixing unit 200. Similarly, the piezoelectric material in the piezoelectric component 230 is also subjected to the impact pressure. As the tire tread leaves the ground, the ground impact received by the fixing unit 200 installed on the inner side 300 of the tire is released, and the pressure on the piezoelectric material in the piezoelectric component 230 integrated in the fixing unit 200 is also eliminated. Thus, the piezoelectric component 230 will generate an alternating current.

[0066] It should be noted that the alternating current generated by the piezoelectric component 230 is transmitted to the sensor unit 100 through the second coil 236 and the first coil 110 relying on the principle of electromagnetic induction. Specifically, the alternating current generated by the piezoelectric component 230 is transmitted to the second coil 236, and the second coil 236 thus generates an alternating magnetic field. The first coil 110 built in the sensor unit 100 is located within the alternating magnetic field. The first coil 110 cuts the magnetic induction lines of the alternating magnetic field generated by the second coil 236, thereby generating an induced electromotive force. The second coil 236 transmits this induced electromotive force to the sensor unit 100. This induced electromotive force can supply power for the operation of the sensor unit 100 or be used as a sensing signal for road condition analysis.

[0067] Reference Figures 3 to 5 , in this application, the fixing unit 200 is provided with a first accommodation cavity 210 for accommodating the sensor unit 100, and the sensor unit 100 and the fixing unit 200 are designed to be detachable, which facilitates the disassembly, installation and maintenance of the sensor unit 100.

[0068] In this application, the power generation module / function originally integrated in the sensor unit 100 is separated from the sensor unit 100 and integrated into the fixing unit 200. At the same time, the fixing unit 200 is separated from the inner surface of the tire. In this way, the contradictions of the sensor unit 100 in terms of power supply, maintenance, installation and positioning are solved simultaneously, and the internal structural design of the sensor unit 100 is simplified. Wireless power transmission is carried out between the sensor unit 100 and the piezoelectric component 230 through the first coil 110 and the second coil 236, which further simplifies the overall circuit structure design of the tire monitoring module and is beneficial to reducing the production and maintenance costs of the sensor unit 100.

[0069] It should be noted that although the piezoelectric component 230 is integrated in the fixing unit 200 as a self-power generation module, the overall mass is still very light and the center of gravity is low, which is beneficial to maintaining the uniformity and dynamic balance of the tire.

[0070] As an example, referring to Figure 5 , the fixing unit 200 further includes an upper cover 220 and a chassis 240. The fixing unit 200 is installed on the inner side 300 of the tire through the bottom surface of the chassis 240. The bottom surface of the upper cover 220 is tightly attached to the top surface of the chassis 240 and defines a second accommodation cavity (not marked in the figure). The second accommodation cavity is used to accommodate the piezoelectric component 230. A protrusion 221 away from the chassis 240 is provided on the top surface of the upper cover 220, and the first accommodation cavity 210 is provided in the protrusion 221.

[0071] It can be understood that the bottom surface of the chassis 240 is the surface in fixed contact with the inner side 300 of the tire, the top surface of the chassis 240 is the surface tightly attached to the upper cover 220. Correspondingly, the bottom surface of the upper cover 220 is the surface tightly attached to the chassis 240, and the top surface of the upper cover 220 is the surface relatively far from the chassis 240.

[0072] Optionally, the bottom surface of the chassis 240 is fixed on the surface of the tire lining by means of adhesive or glue, etc. The bottom surface of the upper cover 220 and the top surface of the chassis 240 are tightly attached by means of glue bonding. In addition, they can also be fixedly connected by hot melt bonding or welding. This application does not make specific limitations here.

[0073] Optionally, the chassis 240 and the upper cover 220 can be made of rubber materials. Specifically, they can be made of the same material as the tire lining layer or different materials. This application does not make strict limitations here.

[0074] Referring to Figure 6 , a first groove 241 is provided on the top surface of the chassis 240, and the second accommodation cavity is the space formed by the bottom surface of the upper cover 220 and the first groove 241 being closed.

[0075] For example, a first mating portion 222 is provided on the bottom surface of the upper cover 220, and a second mating portion 242 is provided on the top surface of the chassis 240. After the bottom surface of the upper cover 220 is tightly attached to the top surface of the chassis 240, the first mating portion 222 and the second mating portion 242 cooperate with each other to play a role in positioning the assembly of the upper cover 220 and the chassis 240.

[0076] Reference Figure 7 , Figure 7 shows a sectional view of the upper cover 220. For example, the first mating portion 222 provided on the bottom surface of the upper cover 220 is a circular groove formed on the bottom surface of the upper cover 220, and the second mating portion 242 provided on the top surface of the chassis 240 is a circular protrusion provided on the top surface of the chassis 240. The size of the circular protrusion is the same as the size of the circular groove. After the bottom surface of the upper cover 220 is tightly attached to the top surface of the chassis 240, the circular protrusion is embedded into the circular groove to play a positioning role.

[0077] As an alternative, the first mating portion 222 can be set as a circular protrusion, and the second mating portion 242 can be set as a circular groove. After the upper cover 220 and the chassis 240 are tightly attached, it also plays a positioning role. It can be understood that the shapes and styles of the first mating portion 222 and the second mating portion 242 are not limited to the solutions shown in this embodiment, and the present application does not make strict limitations here.

[0078] Reference Figure 5 , the protrusion 221 provided on the top surface of the upper cover 220 is generally cylindrical, and the first accommodating cavity 210 is opened inside the cylindrical protrusion 221. The diameter of the opening above the cylindrical container is slightly smaller than the diameter of its inner wall of the cylinder, so that the sensor unit 100 can be fixed in the cylindrical container by physical cooperation. In addition to physical cooperation and fixation, glue can also be used to further fix the sensor unit 100. It should be noted that the protrusion 221 can also be set to other shapes, and the present application does not make specific limitations here.

[0079] Reference Figure 10 , the piezoelectric component 230 further includes a piezoelectric layer 233, an upper electrode 232, and a lower electrode 234. Among them, an opening 2331 is provided in the middle of the piezoelectric layer 233, and the second coil 236 is placed in the opening 2331. The upper electrode 232 and the lower electrode 234 are respectively tightly attached to the upper and lower surfaces of the piezoelectric layer 233. The second coil 236 is provided with two pins 2361, which are electrically connected to the upper electrode 232 and the lower electrode 234 respectively.

[0080] It can be understood that the piezoelectric layer 233 in the piezoelectric component 230 is the core component of the piezoelectric component 230, which has the positive piezoelectric effect and is used to generate an alternating current as the tire rotates periodically. The upper electrode 232 and the lower electrode 234 are respectively in close contact with the upper and lower surfaces of the piezoelectric layer 233, and the upper electrode 232 and the lower electrode 234 are respectively electrically connected to the two pins 2361 of the second coil 236. The alternating current generated by the piezoelectric layer 233 is transmitted to the second coil 236 through the upper electrode 232, the lower electrode 234 and the two pins 2361. The alternating current flowing through the second coil 236 forms an alternating magnetic field, so that the first coil 110 fixed in the sensor unit 100 can generate an induced electromotive force by cutting the alternating magnetic induction line, completing the wireless power transmission process and continuously supplying power for the operation of the sensor unit 100. Optionally, the first coil 110 and the second coil 236 can be made of metal materials such as copper, or can also be made of copper enameled wire or other materials, and the present application does not make specific limitations here.

[0081] As an example, the piezoelectric layer 233 material is made of flexible piezoelectric materials such as flexible piezoelectric rubber or polyvinylidene fluoride. Compared with general piezoelectric ceramic materials, it should have better ductility, better elasticity, and easier volume control. And as a flexible piezoelectric material, it has a higher piezoelectric coefficient so as to convert more mechanical energy of road surface vibration into electrical energy. It should be noted that the piezoelectric layer 233 can also be made of flexible polymer materials or other thin but tough metal materials, and the present application does not make specific limitations here.

[0082] In some embodiments, the piezoelectric component 230 further includes a packaging layer (not labeled in the figure), and the packaging layer defines a third accommodation cavity (not labeled in the figure), and the third accommodation cavity is used to accommodate the upper electrode 232, the lower electrode 234, the piezoelectric layer 233 and the second coil 236.

[0083] Optionally, referring to Figure 10 , the packaging layer includes an upper packaging layer 231 and a lower packaging layer 235, wherein the outer diameter dimension of the lower packaging layer 235 is larger than that of the upper packaging layer 231, and the lower packaging layer 235 is provided with second grooves 2351 of different sizes along the axial direction on the surface where it is cooperatively connected with the upper packaging layer 231, which are respectively used to accommodate the lower electrode 234, the piezoelectric layer 233 and the upper packaging layer 231.

[0084] It can be understood that after the upper packaging layer 231 and the lower packaging layer 235 are closely connected, they define a sealed third accommodation cavity. By accommodating the piezoelectric layer 233, the upper electrode 232, the lower electrode 234 and the second coil 236 in the third accommodation cavity, the protection of the internal components of the piezoelectric component 230 is realized, so that it is completely isolated from the outside atmosphere and not affected by the external environment. In addition, the packaging layer also plays a role in preventing internal circuit short circuits and preventing internal contamination by external dust and other impurities.

[0085] It can be understood that the outer edge dimensions of the upper encapsulation layer 231 and the lower encapsulation layer 235 are larger than the outer edge dimensions of the piezoelectric layer 233, so as to completely encapsulate the piezoelectric layer 233, the upper electrode 232, the lower electrode 234, and the second coil 236 therein.

[0086] Optionally, the encapsulation layer is generally encapsulated with a transparent flexible material, such as a flexible PVC film, or other flexible polymer materials, and the encapsulation method is not limited to the encapsulation method of the upper and lower two pieces of materials in cooperation with the upper encapsulation layer 231 and the lower encapsulation layer 235, and can also be encapsulated by methods such as bagging. The present application does not make specific limitations here.

[0087] Exemplarily, referring to Figure 10 , the piezoelectric layer 233 is in an annular shape, and the space in the middle of the ring is the opening 2331 provided in the piezoelectric layer 233. The lower electrode 234 is also in an annular shape, and there is a protruding slender part electrically connected to the lead 2361 of the second coil 236. The outer diameter of the lower electrode 234 ring is slightly smaller than the outer diameter of the piezoelectric layer 233 ring, and the inner diameter of the lower electrode 234 ring is slightly larger than the inner diameter of the piezoelectric layer 233 ring, so that the lower electrode 234 ring is entirely covered by the piezoelectric layer 233.

[0088] Referring to Figure 11 , Figure 11 shows the assembly relationship among the second coil 236, the piezoelectric layer 233, and the upper electrode 232. As Figure 11 shown, the upper electrode 232 is on the piezoelectric layer 233 and is electrically connected to the piezoelectric layer 233. The upper electrode 232 is simultaneously electrically connected to a lead 2361 of the second coil 236. The lower electrode 234 is electrically connected to the piezoelectric layer 233 below the piezoelectric layer 233 and is electrically connected to the other lead 2361 of the second coil 236. The second coil 236 is located inside the rings of the piezoelectric layer 233 and the lower electrode 234, and the intermediate circuits are insulated from each other through the encapsulation layer.

[0089] Figure 12 shows the assembly relationship among the piezoelectric layer 233, the lower electrode 234, and the second coil 236 in the piezoelectric module. As Figure 12 shown, the lower electrode 234 is below the piezoelectric layer 233. The inner ring radius of the second coil 236 is slightly larger than the inner ring radius of the piezoelectric layer 233, and the outer ring radius of the second coil 236 is slightly smaller than the outer ring radius of the piezoelectric layer 233, so as to avoid short circuit of the upper electrode 232 and the lower electrode 234 due to short connection.

[0090] Optionally, the upper electrode 232 may be in the form of a thin metal sheet and does not necessarily need to cover the piezoelectric layer 233 over the same large area as the lower electrode 234. It is electrically connected to the piezoelectric layer 233 and the pin 2361 of the second coil 236 respectively. Optionally, the upper electrode 232 may also be arranged in a strip shape. Welding or conductive adhesive bonding can be used between the upper electrode 232 and the piezoelectric layer 233, and welding or conductive adhesive bonding can be used between the upper electrode 232 and the pin 2361 of the coil.

[0091] It should be noted that the upper electrode 232 and the lower electrode 234 are mostly made of metal sheets, which have good ductility, are resistant to bending, and have good electrical conductivity. On the premise that the piezoelectric layer 233 realizes the function of generating an alternating current and the upper electrode 232 and the lower electrode 234 realize the function of transmitting the alternating current to the second coil 236, they can all be designed into any other shape, and this application does not make strict limitations here.

[0092] Reference Figure 5 , the assembly position relationship of each part of the fixing unit 200 is as follows: the upper cover 220, the piezoelectric component 230, and the chassis 240 are coaxial and are stacked and fixed in order from top to bottom. The piezoelectric component 230 is installed in the first groove 241 opened on the top surface of the chassis 240 and fixed by glue or other means. The first fitting portion 222 on the bottom surface of the upper cover 220 is aligned with the second fitting portion 242 on the top surface of the chassis 240 to assist in the fitting and fixing of the upper cover 220 and the chassis 240, and the upper cover 220 and the chassis 240 are fixed by glue or other means.

[0093] After the assembly of each part of the fixing unit 200 is completed, the fixing unit 200 is bonded to the surface of the tire inner liner through the bottom surface of the chassis 240. The sensor unit 100 is embedded and installed in the first accommodation cavity 210 provided in the protrusion 221 of the upper cover 220. The sensor unit 100 can be physically fixed against the outer wall of the first accommodation cavity 210 or further fixed with glue.

[0094] Reference Figure 10 , the assembly relationship between each part inside the piezoelectric component 230 is as follows: inside the piezoelectric component 230, each part from top to bottom is: the upper encapsulation layer 231, the upper electrode 232, the second coil 236, the piezoelectric layer 233, the lower electrode 234, and the lower encapsulation layer 235. The upper electrode 232, the piezoelectric layer 233, the second coil 236, and the lower electrode 234 are all encapsulated between the upper encapsulation layer 231 and the lower encapsulation layer 235. Welding or conductive adhesive bonding is used between the upper and lower surfaces of the upper electrode 232, the lower electrode 234 and the piezoelectric layer 233 to achieve close fitting. The upper electrode 232 and the upper electrode 232 are electrically connected to the second coil 236 through the pin 2361, and welding or conductive adhesive bonding is used between the pin 2361 and the upper electrode 232 and the lower electrode 234.

[0095] Reference Figure 13 and Figure 14 , the sensor unit 100 has a first coil 110 built into the bottom. As Figure 13 shown, the first coil 110 is located at the bottom of the sensor unit 100 and as close as possible to the bottom of the sensor unit 100. This allows the first coil 110 built into the sensor unit 100 to be in as close contact as possible with the second coil 236 in the piezoelectric component 230 after the sensor unit 100 is installed in the fixing unit 200, thus maximizing the efficiency of wireless transmission.

[0096] It should be noted that in addition to achieving non-contact electrical connection through wireless transmission of the coil, the sensor unit 100 can also meet the detachable requirement and electrical connection requirement of the sensor unit 100 through contact electrical connection.

[0097] Optionally, the sensor unit 100 can achieve electrical connection through contacts.

[0098] Exemplarily, the present application provides an embodiment of the second aspect. The difference between the embodiment of the second aspect and the embodiment of the first aspect is that the sensor unit 100 is provided with a first contact 120 and a second contact 130, and the first contact 120 and the second contact 130 are used to contact the piezoelectric component 230 to achieve electrical connection.

[0099] Reference Figure 2 , the voltage component includes a piezoelectric layer 233, an upper electrode 232 and a lower electrode 234. An opening 2331 is provided in the middle of the piezoelectric layer 233. The upper electrode 232 and the lower electrode 234 are respectively closely attached to the upper and lower surfaces of the piezoelectric layer 233, and one end of both the upper electrode 232 and the lower electrode 234 protrudes into the opening 2331 of the piezoelectric layer 233. When the sensor unit 100 is placed in the first accommodation cavity 210, the first contact 120 and the second contact 130 extend into the piezoelectric component 230 integrated in the fixing unit 200 and contact the upper electrode 232 and the lower electrode 234 respectively to achieve circuit connection, so as to transmit the alternating current generated by the piezoelectric component 230 to the sensor unit 100 through the upper electrode 232, the lower electrode 234, the first contact 120 and the second contact 130 to supply power to the sensor unit 100.

[0100] As an example, in the present application, a first opening 223 is provided on the bottom surface of the upper cover 220 of the fixing unit 200. The first opening 223 communicates with the first accommodating cavity 210, and the position of the first opening 223 corresponds to the position of an opening 2331 provided in the middle of the piezoelectric layer 233. After the sensor unit 100 is placed in the first accommodating cavity 210, the first contact 120 and the second contact 130 can pass through the upper cover 220 of the fixing unit 200 through the first opening 223, so as to contact the upper electrode 232 and the lower electrode 234 of the piezoelectric assembly 230.

[0101] As an example, in the present application, a second opening 2311 is provided in the upper encapsulation layer 231. The position of the second opening 2311 also corresponds to the position of an opening 2331 provided in the middle of the piezoelectric layer 233, and the upper electrode 232 and the lower electrode 234 of the piezoelectric layer 233 are exposed in the second opening 2311. After the sensor unit 100 is placed in the first accommodating cavity 210, the first contact 120 and the second contact 130 first pass through the first opening 223 provided on the bottom surface of the upper cover 220, and then pass through the second opening 2311 provided in the upper encapsulation layer 231, and extend to the position of the opening 2331 provided in the middle of the piezoelectric layer 233. The first contact 120 and the second contact 130 respectively contact the upper electrode 232 and the lower electrode 234 of the piezoelectric assembly 230, realizing the electrical connection between the piezoelectric layer 233 and the sensor unit 100.

[0102] It can be understood that other technical features not mentioned in the embodiments of the second aspect can refer to the embodiments of the first aspect of the present application, and the present application will not repeat them here.

[0103] An embodiment of the third aspect of the present application provides a monitoring method for a tire monitoring module, including: installing a tire monitoring module on the inner side 300 of a tire, where the tire monitoring module includes a fixing unit 200 and a sensor unit 100; generating an alternating current through the deformation of a piezoelectric assembly 230 integrated in the fixing unit 200; the piezoelectric assembly 230 transmits the alternating current to the sensor unit 100 by one of the following methods: transmitting an alternating current to a first coil 110 provided in the sensor unit 100 through a second coil 236 provided in the piezoelectric assembly 230; transmitting an alternating current through the contact between a first contact 120 and a second contact 130 provided in the sensor unit 100 and an upper electrode 232 and a lower electrode 234 provided in the piezoelectric assembly 230.

[0104] Optionally, the tire monitoring module is installed on the inner side 300 of the tire through the fixing unit 200, and the sensor unit 100 is detachably installed in a first accommodating cavity 210 opened in the fixing unit 200.

[0105] Monitoring method of a tire monitoring module. Specifically, the fixed unit 200 fixed to the inner surface of the tire deforms together with the tire when it touches the ground, causing the embedded piezoelectric component 230 to be compressed. The piezoelectric layer 233 in the piezoelectric component 230 generates a piezoelectric effect to produce an alternating current. The alternating current generates an alternating magnetic field through the second coil 236 in the piezoelectric component 230. The sensor unit 100 fixed to the fixed unit 200 and located directly above the piezoelectric component 230 has a first coil 110 built-in. The first coil 110 built-in the sensor unit 100 cuts the alternating magnetic field in the piezoelectric component 230, thereby generating an induced electromotive force in the first coil 110 built-in the sensor unit 100. Thus, the electrical energy generated by the piezoelectric component 230 due to the deformation of the tire when it touches the ground is wirelessly transmitted into the sensor unit 100 for use or analysis by the sensor unit 100.

[0106] Reference Figure 2 , Figure 2 Figure Figure 2 is a schematic diagram after the fixed unit 200 nests the sensor unit 100 and is fixed on the surface of the inner liner of the tire inner side 300. In the figure, as the tire rotates, the tire inner side 300 where the fixed unit 200 is located deforms due to the influence of the grounding impact. The inner liner of the tire inner side 300 drives the fixed unit 200 to deform, thereby squeezing the internal piezoelectric component 230. The piezoelectric component 230 generates a piezoelectric effect. A peak voltage is generated when the tire starts to touch the ground, and a peak-to-valley voltage is generated when the tire starts to leave the ground. In this way, the piezoelectric component 230 generates an alternating current. These alternating currents are conducted through the upper electrode 232 and the lower electrode 234 to the second coil 236 in the piezoelectric component 230. The second coil 236 in the piezoelectric component 230 generates an alternating magnetic field. The first coil 110 built-in the sensor unit 100 located directly above the second coil 236 in the piezoelectric component 230 cuts the magnetic induction lines of the alternating magnetic field, generating an induced electromotive force, thereby transmitting the electrical energy emitted by the piezoelectric component 230 into the sensor unit 100 to continuously power the tire monitoring module.

[0107] In summary, the tire monitoring module and its detection method proposed in this application have the following beneficial effects:

[0108] (1) Without destroying the original structure of the tire, it solves the two major problems of fixing and power supply of the tire sensor unit 100 at the same time, and further reduces the maintenance costs of the sensor unit 100 and the fixed unit 200.

[0109] (2) Since the self-power generation module is removed from the sensor unit 100, on the premise of solving the power supply of the sensor unit 100, the complexity of the sensor unit 100 does not increase but decreases, which is beneficial to reducing the production and maintenance costs of the sensor unit 100.

[0110] (3) Although integrated with power generation function, the fixed unit 200 still has a very light mass and a low center of gravity, which is beneficial to maintaining the uniformity and dynamic balance of the tire.

[0111] The embodiments of the present application have been described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the above embodiments, and various changes can be made without departing from the gist of the present application within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. Tire monitoring module, characterized in that Comprising: A sensor unit; A fixing unit, one side of which is mounted on the inner side of the tire. The fixing unit is provided with a first accommodating cavity, and the sensor unit can be detachably accommodated in the first accommodating cavity; A piezoelectric component is integrated in the fixing unit. The piezoelectric component is electrically connected to the sensor unit and transmits the generated alternating current to the sensor unit.

2. The tire monitoring module according to claim 1, wherein: The sensor unit is internally provided with a first coil, and the piezoelectric component is internally provided with a second coil. The alternating current generated by the piezoelectric component is transmitted to the sensor unit through the second coil and the first coil.

3. The tire monitoring module according to claim 1, characterized in that: The fixing unit further includes an upper cover and a chassis; The bottom surface of the chassis is mounted on the inner side of the tire; The bottom surface of the upper cover is tightly attached to the top surface of the chassis and defines a second accommodating cavity for accommodating the piezoelectric component; The top surface of the upper cover is provided with a protrusion away from the chassis, and the first accommodating cavity is provided in the protrusion.

4. The tire monitoring module according to claim 3, characterized in that: The bottom surface of the upper cover is provided with a first opening, and the first accommodating cavity is communicated with the first opening; The sensor is further provided with a first contact and a second contact, and the sensor is electrically connected to the piezoelectric component through the first contact and the second contact.

5. The tire monitoring module according to claim 2, characterized in that: The piezoelectric component further includes a piezoelectric layer, an upper electrode and a lower electrode; An opening is provided in the middle of the piezoelectric layer, and the second coil is located in the opening; The upper electrode and the lower electrode are respectively tightly attached to the upper and lower surfaces of the piezoelectric layer; The second coil is provided with two pins, which are electrically connected to the upper electrode and the lower electrode respectively.

6. The tire monitoring module according to claim 1, wherein: The piezoelectric component further includes a piezoelectric layer, an upper electrode and a lower electrode; An opening is provided in the middle of the piezoelectric layer; The upper electrode and the lower electrode are respectively tightly attached to the upper and lower surfaces of the piezoelectric layer; One end of both the upper electrode and the lower electrode protrudes from the opening.

7. The tire monitoring module according to claim 5, characterized in that: The piezoelectric component further includes a packaging layer, and the packaging layer defines a third accommodating cavity for accommodating the upper electrode, the lower electrode, the piezoelectric layer and the second coil.

8. The tire monitoring module according to claim 7, wherein: The packaging layer includes an upper packaging layer and a lower packaging layer. The outer diameter of the lower packaging layer is larger than that of the upper packaging layer. The lower packaging layer is provided with second grooves of different sizes along the axial direction on the surface where it is cooperatively connected with the upper packaging layer, respectively for accommodating the lower electrode, the piezoelectric layer and the upper packaging layer.

9. The tire monitoring module according to claim 3, characterized in that: The top surface of the chassis is provided with a first groove, and the second accommodating cavity is a space formed by closing the bottom surface of the upper cover and the first groove.

10. The tire monitoring module according to claim 8, characterized in that: The upper packaging layer is provided with a second opening, and the position of the second opening corresponds to the position of the opening.

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