TWM572982U - Tyre pressure monitoring system (TPMS) - Google Patents

Abstract

The invention discloses a tire pressure monitoring system, which solves the problem that the antenna occupant module is too large in the prior art by disposing the antenna on the inner and outer surfaces of the outer casing or embedded in the surface of the outer casing, and at the same time, arranging the antenna On the outer casing, the space and area of the antenna winding are relatively large, so that the efficiency of the antenna is improved.

Description

Tire pressure monitoring system

The present invention relates to automotive electronics technology, and in particular to a tire pressure monitoring system.

Tire Pressure Monitoring System (TPMS) is a device used to monitor tire pressure and maintain proper pressure. The use of the tire pressure monitoring system is important for ensuring the driving safety of the vehicle. In a tire pressure monitoring system, a sensor that detects pressure is typically placed in the tire to transmit the detected tire pressure to the vehicle's data processing device for monitoring and prompting. In the existing tire pressure monitoring system, when transmitting signals wirelessly, most of the frequency bands used are 433Mhz or 315433Mhz, and the corresponding antenna lengths (1/4 λ) are 17cm and 24cm. If high-efficiency antennas of this length are to be used (such as a spring antenna) placed in the module will make the module larger and heavier. If the "wafer antenna" is used instead, the module volume will be reduced, but the 17cm metal wire is densely wound in a small space, and the antennas will interfere with each other, so that the efficiency of the antenna will be much reduced, and the RF signal, It is often impossible to penetrate the tire and send the signal to the receiver of the driver's seat. The prior art US Pat. No. 7,916,611 B2 discloses an antenna scheme in which the antenna is connected to the PCB in the tire pressure monitoring system module by using the metal valve of the tire as an antenna and bridging with a metal spacer and screwing it. This solution places the antenna outside the tire pressure monitoring system module, which can make the module smaller. However, this solution has two obvious disadvantages: First, after the valve is installed, sometimes it will contact the steel ring of the tire due to vibration, and the steel ring is also made of conductive material, so it will be electrically connected with the steel ring, which will The entire steel ring will be used as an antenna. The length of the steel ring is too long, so that the RF signal cannot be emitted. Second, the connection between the valve and the PCB is bridged by a metal piece and fixed by screws, sometimes due to the code of the screw lock. The number is not enough, or the surface of the metal sheet is oxidized, so that the resistance value of the antenna is too large, resulting in antenna failure.

In view of this, the present invention provides a tire pressure monitoring system to solve the problem that the arrangement of the antenna makes the module too large in the prior art. The present invention provides a tire pressure monitoring system comprising: an outer casing; an antenna disposed on an outer surface or an inner surface of the outer casing and electrically connected to the PCB. Preferably, the antenna extends in a meandering manner on at least one or a portion of the surface of the outer surface of the outer casing; or the antenna extends in a meandering manner on at least one or a portion of the inner surface of the outer casing. Preferably, the outer casing has a rectangular parallelepiped structure. Preferably, the antenna is meanderly extended on the first surface, the second surface and the third surface of the outer casing, the first surface is opposite to the second surface, and the third surface is connected to the first surface and The surface of the two surfaces. Preferably, at least a portion of the antenna is embedded in at least one surface of the outer casing and extends in a meandering manner in the surface. Preferably, the antenna is placed in a molding module of the outer casing before the outer casing is molded, and the antenna can be fixed in the surface of the outer casing after the outer casing is demolded. Preferably, one end of the antenna is electrically connected to the PCB board in a soldering manner. Preferably, when the antenna is disposed on an outer surface of the outer casing or embedded in at least one surface of the outer casing, at least one surface of the outer casing is provided with a through hole for inserting an antenna, so that The antenna is electrically connected to the PCB board that is within the housing. Preferably, the tire pressure monitoring system further includes an antenna matching circuit, and the antenna matching circuit is connected to the antenna. Preferably, the outer casing is a cylinder, an ellipsoid or a spherical structure. Preferably, the tire pressure monitoring system further includes a pressure sensor mounted in the outer casing for detecting a tire pressure of the tire. The novel technology solves the problem that the antenna occupies the module is too large in the prior art by arranging the antenna on the inner and outer surfaces of the outer casing or embedded in the surface of the outer casing. At the same time, the antenna is arranged on the outer casing and the antenna is wound. The space and area are relatively large, which makes the antenna more efficient.

Several preferred embodiments of the present invention are described in detail below with reference to the drawings, but the present invention is not limited to the embodiments. The present invention encompasses any alternatives, modifications, equivalents, and alternatives to the spirit and scope of the present invention. In order to provide a thorough understanding of the present invention, the specific details are described in detail in the following preferred embodiments of the present invention, and the present invention may be fully understood by those skilled in the art. 1 is a schematic view of a tire pressure monitoring system of the present embodiment. As shown, the tire pressure monitoring system of the present embodiment includes a housing 1, an antenna 2, and an internal module. Figure 2 is a structural view of a module in the housing. It can be seen that the module includes a PCB board, a battery 3, an integrated circuit IC, and an antenna matching circuit LC, wherein the PCB board is further provided with soldering points 4 soldered to the antenna 2. The module shown in Fig. 2 is placed in the outer casing 1 shown in Fig. 1. The outer casing 1 is used to protect the module from damage. Here, the outer casing 1 is made of an insulating plastic material. Among them, the battery 3 is used to supply power to the tire pressure monitoring system to ensure its normal operation. The integrated circuit IC integrates a device such as a pressure sensor to detect the tire pressure of the tire and transmit it to the display of the driver's seat. The antenna 1 is used for wireless transmission of signals in the tire pressure monitoring system. Generally, the antennas are all equipped with an antenna matching circuit LC, and the antenna matching circuit LC is connected with the antenna 2 for impedance matching, so that the transmission efficiency is improved. In the present invention, the antenna 2 is disposed on the outer or inner surface of the outer casing 1 and is electrically connected to the PCB. Specifically, the antenna 2 is meandered over at least one or a portion of the surface of the outer surface of the outer casing 1; alternatively, the antenna 2 is meandered over at least one or a portion of the inner surface of the outer casing 1. One embodiment in which the antenna 2 is disposed on the outer surface of the outer casing 1 is presented in FIG. Here, the case where the outer casing is the most common rectangular parallelepiped structure will be described as an example. 3 is a front view of the tire pressure monitoring system of the present embodiment. It can be seen with reference to FIGS. 1 and 3 that the antenna 2 is meandering on the first surface, the second surface and the third surface of the outer casing 1, the first A surface is opposite the second surface, the third surface being a surface connecting the first surface and the second surface. The advantages of arranging the antenna in this way are as follows: Firstly, the problem that the antenna occupies the module is too large in the prior art is solved. The novel arrangement of the antenna on the outer casing does not increase the volume of the module; the second is to arrange the antenna on the outer casing. The space and area of the antenna winding are relatively large, which can improve the efficiency of the antenna, so that the radio frequency signal can penetrate the metal mask layer of the tire. Here, an embodiment of the three surfaces of the outer casing 1 of the antenna 2 is proposed. It can be understood that the antenna 2 can also be disposed only on one surface of the outer casing 1, or the antenna 2 can span four of the outer casing 1. , five, or all of the surface tortuous extension. Of course, it can also be understood that the antenna 2 can also be disposed on the inner surface of the outer casing 1 based on the above principles and problems solved, and the same technical effect can be achieved. It should also be noted that the structure of the outer casing 1 is not limited to the rectangular parallelepiped in the embodiment, and may be a cylinder, an ellipsoid, a sphere or the like. In the present invention, the antenna 2 can also be arranged in the surface of the outer casing 1, that is, in the interlayer of the outer surface of the outer casing. Generally, the thickness of the outer casing is larger than the diameter of the antenna, whereby the antenna can be embedded in the surface of the outer casing. Therefore, the antenna can be better fixed, and the purpose of protecting the antenna from damage can be further achieved. Specifically, at least a portion of the antenna 2 is embedded in at least one surface of the outer casing 1 and extends in a meandering manner in the surface. 4 is a schematic view of the first step of arranging the antenna in the surface of the outer casing, FIG. 5 is a schematic view of the second step of arranging the antenna in the surface of the outer casing, and FIG. 6 is a schematic view of the second step of arranging the antenna in the surface of the outer casing. . Here, the description will be made by taking an example in which the antenna 2 is entirely embedded in one surface of the outer casing 1. Preferably, when the antenna 2 is embedded in the surface of the outer casing 1, the antenna 2 may be placed in the molding module 5 of the outer casing 1 before being molded by the outer casing 1 as shown in FIG. 4, and then according to the figure. As shown in FIG. 5, the glue is poured into the predetermined gap of the molding module 5. Finally, as shown in FIG. 6, when the outer casing 1 is demolded and injection molded, the antenna 2 can be fixed to the outer casing 1. In the surface. Preferably, one end of the antenna 2 is electrically connected to the PCB board in a soldering manner. Therefore, when the antenna 2 is disposed on the outer surface of the outer casing 1, or embedded in at least one surface of the outer casing 1, at least one surface of the outer casing 1 is provided with a through hole for inserting the antenna 2 so that the antenna 2 is located The PCB boards within the housing 1 can be electrically connected at the solder joint 4. The tire pressure monitoring system of the present invention solves the problem that the antenna occupant module is too large in the prior art by arranging the antenna on the inner and outer surfaces of the outer casing or embedded in the surface of the outer casing, and at the same time, arranging the antenna in the outer casing In the above, the space and the area of the antenna winding are relatively large, so that the efficiency of the antenna is improved. The details of the embodiments are not described in detail, and are not intended to limit the details. Obviously, many modifications and variations are possible in light of the above description. The present invention has been selected and described in detail to explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use on the basis of the present invention. The present invention is limited only by the scope of the patent application and its full scope and equivalents.

1‧‧‧Shell

2‧‧‧Antenna

3‧‧‧Battery

4‧‧‧ solder joints

5‧‧‧Molding module

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings used in the embodiments or the description of the prior art will be briefly introduced. It is obvious that the drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can obtain other drawings according to the provided drawings without paying creative labor. 1 is a schematic view of a tire pressure monitoring system according to a new embodiment; FIG. 2 is a structural view of a module in a casing; FIG. 3 is a front view of the tire pressure monitoring system of the present embodiment; A schematic diagram of the first step in the outer casing; FIG. 5 is a schematic view of the second step of arranging the antenna in the outer casing; and FIG. 6 is a schematic view of the second step of arranging the antenna in the outer casing.

Claims (11)

A tire pressure monitoring system includes: an outer casing; an antenna disposed on an outer surface or an inner surface of the outer casing and electrically connected to the PCB board. The tire pressure monitoring system of claim 1, wherein the antenna is meander-folded on at least one or a portion of a surface of an outer surface of the outer casing; or the antenna is on an inner surface of the outer casing. At least one or a portion of the surface extends in a meandering manner. The tire pressure monitoring system according to claim 2, wherein the outer casing has a rectangular parallelepiped structure. The tire pressure monitoring system of claim 3, wherein the antenna is meander-folded on the first surface, the second surface, and the third surface of the outer casing, the first surface and the second surface being opposite The third surface is a surface connecting the first surface and the second surface. The tire pressure monitoring system of claim 1, wherein at least a portion of the antenna is embedded in at least one surface of the outer casing and extends in a meandering manner in the surface. The tire pressure monitoring system according to claim 5, wherein the antenna is placed in a molding module of the outer casing before the outer casing is molded, and when the outer casing is demolded, The antenna can be fixed in the surface of the outer casing. The tire pressure monitoring system according to claim 1, wherein one end of the antenna is electrically connected to the PCB board in a soldering manner. The tire pressure monitoring system according to claim 2, wherein the antenna is at least when the antenna is disposed on an outer surface of the outer casing or embedded in at least one surface of the outer casing On one surface, a through hole for inserting an antenna is opened to electrically connect the antenna to the PCB board located inside the housing. The tire pressure monitoring system of claim 1, wherein the tire pressure monitoring system further comprises an antenna matching circuit, the antenna matching circuit being coupled to the antenna. The tire pressure monitoring system according to claim 2, wherein the outer casing is a cylindrical body, an ellipsoid or a spherical structure. The tire pressure monitoring system of claim 1, wherein the tire pressure monitoring system further comprises a pressure sensor mounted in the outer casing for detecting a tire pressure of the tire.