CN220842095U - High-precision tire pressure monitoring control device - Google Patents
High-precision tire pressure monitoring control device Download PDFInfo
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- CN220842095U CN220842095U CN202322851237.8U CN202322851237U CN220842095U CN 220842095 U CN220842095 U CN 220842095U CN 202322851237 U CN202322851237 U CN 202322851237U CN 220842095 U CN220842095 U CN 220842095U
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- 238000005259 measurement Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000012806 monitoring device Methods 0.000 description 2
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Abstract
The utility model provides a high-precision tire pressure monitoring control device, which has higher detection precision, can timely and accurately detect the slow air leakage condition of a tire, and ensures the driving safety. The tire monitoring module detects the temperature, the air pressure and other data of the tire, the tire monitoring module is connected with the radio frequency receiver circuit in a wireless mode, the radio frequency receiver circuit transfers the data to the singlechip circuit for processing and then is connected with the central control display screen through the CAN interface module, the tire is monitored, and the measurement accuracy is higher due to the fact that the tire monitoring module adopts the SP400 tire pressure sensor, so that the tire is monitored in a slow air leakage mode, and the driving safety is guaranteed.
Description
Technical Field
The utility model relates to the technical field of automobile tire pressure monitoring devices, in particular to a high-precision tire pressure monitoring control device.
Background
The direct TPMS is fully called as a wireless tire pressure monitoring system and comprises a tire monitoring module and a data processing module. The tire monitoring module is usually arranged on a hub inside a tire and is responsible for monitoring the real-time state of the air pressure and the temperature inside the tire, and when abnormal conditions such as high air pressure, low air pressure or high temperature occur, alarm information is timely sent to the data processing module in a wireless signal form, and the tire monitoring module belongs to a transmitting module. The data processing module is usually arranged in the middle of the vehicle body or placed on an instrument desk and is responsible for receiving, processing and displaying the current pressure and temperature conditions in the tire, and belongs to the receiving module.
The accuracy of the air pressure detection inside the tire is determined by the pressure sensor in the tire monitoring module. Early pressure sensors, such as SP37, are limited by the resolution of an internal analog-to-digital converter, the detection accuracy is not high, the slow leakage condition of the tire cannot be detected, and early discovery and early prevention cannot be achieved, while the resolution of the current widely-used SP370 pressure sensor is only 10 bits, only the accurate measurement value of one bit (more than 10 kPa) after a decimal point can be displayed, and the detection accuracy is not high, so that the slow leakage condition of the tire is still difficult to detect.
Disclosure of utility model
Aiming at the problems that the existing tire pressure monitoring device is low in detection precision and difficult to detect the abnormality of slow air leakage of a tire, the utility model provides the high-precision tire pressure monitoring control device, which is higher in detection precision, can timely and accurately detect the condition of slow air leakage of the tire and ensures driving safety.
The technical scheme is as follows: high accuracy tyre pressure monitoring controlling means, its characterized in that: the tire monitoring system comprises a tire monitoring module, wherein the tire monitoring module comprises four tire monitoring modules and has the same structure, the tire monitoring module is connected with a data processing module, the data processing module is connected with a central control display screen through a CAN interface module, and the data processing module comprises a radio frequency receiver circuit, a singlechip circuit and a power supply circuit for internal power supply;
The tire monitoring module comprises a tire pressure sensor U3, the tire pressure sensor U3 adopts an SP400 tire pressure sensor, 1, 2, 3 and 5 pins of the tire pressure sensor U3 are respectively connected with one end of a capacitor C23, one end of a capacitor C20, one end of a capacitor C21 and one end of a capacitor C22, the other ends of the capacitor C23, the capacitor C20, the capacitor C21 and the capacitor C22 are connected and then grounded, 6 pins of the tire pressure sensor U3 are connected with one end of a capacitor C19 and one end of a crystal oscillator G3, the other end of the capacitor C19 is grounded, the other end of the crystal oscillator G3 is connected with one end of a capacitor C24, one end of the other end of the crystal oscillator C24 is connected with one end of the capacitor C7 pin of the tire pressure sensor U3, one end of the capacitor C24 is grounded, one end of the other end of the capacitor C8 pin of the capacitor C5 is connected with one end of the capacitor R5, one end of the capacitor C27 is connected with one end of the inductor L5, the other end of the resistor R5, the other end of the capacitor C27 is connected with the other end of the capacitor C27, the other end of the inductor L5 is connected with the other end of the capacitor C21, the other end of the capacitor C22 is connected with the other end of the capacitor C21, the other end of the capacitor C22 is connected with one end of the capacitor C31, the other end of the capacitor C26, the other end of the capacitor C30 is connected with one end of the capacitor C26, the other end of the capacitor C30, and the other end of the capacitor C30 is connected with one end of the capacitor C30, and the other end of the capacitor C3.
It is further characterized by: the single-chip microcomputer circuit comprises a single-chip microcomputer U1, the single-chip microcomputer U1 adopts an STM8S208RB single-chip microcomputer, a pin 1 of the single-chip microcomputer U1 is connected with one end of a resistor R2 and one end of a capacitor C1, the other end of the resistor R2 is connected with a 5V voltage source, the other end of the capacitor C1 is connected with one end of a resistor R4 and grounded, the other end of the resistor R4 is connected with a pin 12 of the single-chip microcomputer U1, a pin 6 of the single-chip microcomputer U4 is grounded through the capacitor C2, pins 4, 5, 20, 21 and 39 of the single-chip microcomputer U1 are grounded, pins 7, 8, 18, 19 and 40 of the single-chip microcomputer U1 are connected with a 5V voltage source, pins 37, 38, 41 and 42 of the single-chip microcomputer U1 are respectively connected with a radio frequency receiver circuit, and pins 43, 44 and 60 of the single-chip microcomputer U1 are connected with the CAN interface module;
The radio frequency receiver circuit comprises a receiver U2, the receiver U2 adopts a MAX1471 receiver, a pin 1 of the receiver U2 is connected with one end of a capacitor C5 and one end of a resistor R3, the other end of the capacitor C5 is grounded, the other end of the resistor R3 is connected with one end of a capacitor C4 and one end of the receiver U2, a pin 3 of the receiver U2 is grounded through the capacitor C3, the other end of the capacitor C4 is connected with a pin 4 of the receiver U2, pins 5 and 6 of the receiver U2 are respectively connected with one end of a capacitor C14 and one end of a capacitor C15, the other end of the capacitor C14 and the other end of the capacitor C15 are connected with two ends of a crystal oscillator G1, a pin 7 of the receiver U2 is grounded through the capacitor C6, pins 8 and 9 of the receiver U2 are respectively connected with one end of an inductor L1 and one end of an inductor L3, the other end of the inductor L1 is grounded through the capacitor C7, and the other end of the inductor L3 is grounded, the capacitor is characterized IN that a pin 10 of the receiver U2 is connected with one end of a capacitor C11, one end of a capacitor C9 and one end of an inductor L2, the other end of the capacitor C11 is connected with the pin 11 of the receiver U2, the other end of the capacitor C9 is connected with one end of a capacitor C8, one end of the inductor L2, one end of the capacitor C10 and a voltage source VDD, the other end of the capacitor C10 is grounded, the other end of the capacitor C8 is connected with a pin 12 of the receiver U2, pins 13 and 16 of the receiver U2 are respectively connected with a pin IN and a pin OUT of a filter U6, a pin 14 of the receiver U2 is connected with one end of the capacitor C12 and the GND pin of the filter U4, the other end of the capacitor C12 is connected with a pin 15 of the receiver U2, pins 17, 18 and 23 of the receiver U2 are connected with one end of the capacitor C27, one end of the capacitor C23 is grounded, one end of the capacitor C27 is connected with one end of the resistor R8 and the 19 of the receiver U2, and the other end of the resistor R8 is connected with one end of the capacitor C22, the other end of the capacitor C22 is connected with the pin 22 of the receiver U2, the other end of the capacitor C23 is connected with the pin 24 of the receiver U2 and the voltage source VDD, the pin 21 of the receiver U2 is grounded through the capacitor C21, the pins 25, 26, 27 and 28 of the receiver U2 are respectively connected with the pins 42, 37, 41 and 38 of the singlechip U1, the pin 29 of the receiver U2 is connected with the voltage source VDD, and the pins 30, 31 and 32 of the receiver U2 are grounded;
The CAN interface module comprises a CAN transceiver U4, pins 1, 4 and 8 of the CAN transceiver U4 are respectively connected with pins 43, 44 and 60 of the singlechip U1, a pin 2 of the CAN transceiver U4 is connected with one end of a capacitor C76 and is grounded, the other end of the capacitor C76 is connected with a pin 3 and a 5V voltage source of the CAN transceiver U4, a pin 6 of the CAN transceiver U4 is connected with a pin 2 of the interface XS1, a pin 7 of the CAN transceiver U4 is connected with one end of a resistor R49, and the other end of the resistor R49 is connected with a pin 1 of the interface XS 1.
After the structure is adopted, the high-precision tire pressure monitoring control device comprises four tire monitoring modules, the tire monitoring modules are connected with the radio frequency receiver circuit in a wireless mode, the radio frequency receiver circuit transmits the data to the singlechip circuit for processing and then is connected with the central control display screen through the CAN interface module, so that the monitoring of tires is finished, and the measurement precision of the tire monitoring modules is higher due to the adoption of the SP400 tire pressure sensor, so that the slow air leakage of the tires CAN be monitored, and the driving safety is ensured.
Drawings
FIG. 1 is a schematic circuit diagram of a tire monitoring module of the present utility model;
FIG. 2 is a schematic circuit diagram of a single-chip microcomputer circuit of the present utility model;
fig. 3 is a schematic circuit diagram of a radio frequency receiver circuit of the present utility model;
FIG. 4 is a schematic circuit diagram of a CAN interface module of the utility model;
Fig. 5 is a schematic circuit diagram of a power supply circuit of the present utility model.
Detailed Description
The high-precision tire pressure monitoring control device comprises a tire monitoring module, wherein the tire monitoring module comprises four wheels and has the same structure, and the tire monitoring module is respectively arranged on a rim inside each tire and is responsible for detecting information such as air pressure, temperature and the like inside the tire. The tire monitoring module is connected with the data processing module, the data processing module is connected with the central control display screen through the CAN interface module, the data processing module is used for processing information such as air pressure and temperature, and the processing result, the air pressure value, the temperature value and the like are packaged and sent to the central control display screen through the CAN interface module. The data processing module comprises a radio frequency receiver circuit, a singlechip circuit and a power supply circuit for internal power supply, wherein the radio frequency receiver circuit is connected with the tire monitoring module in a wireless mode and transmits data to the singlechip circuit, and the singlechip circuit transmits the processed data to the central control display screen through the CAN interface module.
Specifically, as shown in fig. 1, the tire monitoring module comprises a tire pressure sensor U3, the tire pressure sensor U3 adopts an SP400 tire pressure sensor, the adopted SP400 tire pressure sensor has low power consumption and small volume, and can be matched with most rims on the market, and meanwhile, the measurement accuracy is improved from 10-bit ADC to 13-bit ADC, so that the measurement accuracy is improved, and technical assurance is provided for solving the problem of slow air leakage monitoring. In addition, SP400 only needs one 26MHz crystal oscillator to support both 315MHz and 433.92MHz operating frequencies, while SP370 needs two crystal oscillators to support both operating frequencies. The 1, 2, 3 and 5 pins of the tire pressure sensor U3 are respectively connected with one end of a capacitor C23, a capacitor C20, a capacitor C21 and a capacitor C22, the other ends of the capacitor C23, the capacitor C20, the capacitor C21 and the capacitor C22 are connected and then grounded, the 6 pin of the tire pressure sensor U3 is connected with one end of a capacitor C19 and one end of a crystal oscillator G3, the other end of the capacitor C19 is grounded, the other end of the crystal oscillator G3 is connected with one end of a capacitor C24 and 7 pins of the tire pressure sensor U3, the other end of the capacitor C24 is grounded, the 8 pin of the tire pressure sensor U3 is connected with one end of a resistor R5, one end of a capacitor C27, one end of an inductor L5, the other end of the resistor R5, the other end of the capacitor C27 and the other end of the inductor L5 are connected and then connected with the 9 pins of the tire pressure sensor U3, the 10 pins of the tire pressure sensor U3 are grounded through a capacitor C25, the 11 feet of tire pressure sensor U3 are grounded, inductance L6 one end is connected to the 12 feet of tire pressure sensor U3, inductance L7 one end is connected to the inductance L6 other end, inductance L8 one end, electric capacity C30 other end ground connection, electric capacity C31 one end is connected to electric capacity L8 another ground connection, electric capacity C32 one end, the electric capacity C31 other end, the electric capacity C32 other end is grounded respectively, electric capacity C28 one end is connected to the inductance L7 other end, electric capacity C29 one end, tire pressure sensor U3's 13 feet, the electric capacity C28 other end, the anodal ground connection of electric capacity C26 one end is connected after the electric capacity C29 other end links to each other, the electric capacity C26 other end links to each other with the negative pole of battery DC2 back with tire pressure sensor U3's 14 feet and is connected.
As shown in FIG. 2, the singlechip circuit includes singlechip U1, singlechip U1 adopts STM8S208RB singlechip, 1 foot connection resistance R2 one end, electric capacity C1 one end of singlechip U1, the 5V voltage source is connected to the resistance R2 other end, electric capacity C1 other end connection resistance R4 one end and ground connection, the resistance R4 other end is connected singlechip U1 'S12 feet, singlechip U4' S6 feet pass through electric capacity C2 ground connection, singlechip U1 'S4, 5, 20, 21, 39 feet ground connection, singlechip U1' S7, 8, 18, 19, 40 feet are connected 5V voltage source, singlechip U1 'S37, 38, 41, 42 feet are connected radio frequency receiver circuit respectively, singlechip U1' S43, 44, 60 feet are connected CAN interface module.
As shown in fig. 3, the radio frequency receiver circuit includes a receiver U2, the receiver U2 adopts a MAX1471 receiver, and wireless communication between the tire pressure sensor U3 and the receiver U2 adopts a frequency shift keying modulation mode, and the modulation frequency is 315MHz. The pin 1 of the receiver U2 is connected with one end of a capacitor C5 and one end of a resistor R3, the other end of the capacitor C5 is grounded, the other end of the resistor R3 is connected with one end of a capacitor C4 and one end of a 2 pin 2 of the receiver U2, the other end of the capacitor C4 is connected with one end of a 4 pin of the receiver U2, the pins 5 and 6 of the receiver U2 are respectively connected with one end of a capacitor C14 and one end of a capacitor C15, the other end of the capacitor C14 and the other end of the capacitor C15 are respectively connected with two ends of a crystal oscillator G1, the pin 7 of the receiver U2 is grounded through a capacitor C6, the pins 8 and 9 of the receiver U2 are respectively connected with one end of a capacitor L1 and one end of a capacitor L3, the other end of the inductor L1 is grounded through a capacitor C7, the other end of the inductor L3 is grounded, the pin 10 of the receiver U2 is connected with one end of a capacitor C11 and one end of a capacitor L2, the other end of the capacitor C11 is connected with the other end of the 11 of the receiver U2, the other end of the capacitor C9 is connected with one end of the capacitor C8, the other end of the capacitor L2 and one end of the capacitor C10 and a voltage source, the other end of the capacitor C10 is grounded, the other end of the capacitor C8 is connected with the 12 pin of the receiver U2, the 13 pin and the 16 pin of the receiver U2 are respectively connected with the IN pin and the OUT pin of the filter U6, the 14 pin of the receiver U2 is connected with one end of the capacitor C12 and the GND pin of the filter U4, the other end of the capacitor C12 is connected with the 15 pin of the receiver U2, the 17 pin, the 18 pin and the 23 pin of the receiver U2 are connected with one end of the capacitor C27 and the ground, the other end of the capacitor C27 is connected with one end of the resistor R8 and the 19 pin of the receiver U2, the other end of the resistor R8 is connected with one end of the capacitor C22 and the 20 pin of the receiver U2, the other end of the capacitor C22 pin of the capacitor C22 is connected with the receiver U2, the other end of the capacitor C23 is connected with the 24 pin of the receiver U2 and the voltage source VDD, the 21 pin of the receiver U2 is grounded through the capacitor C21, and the 25, 26, 27 and 28 pins of the receiver U2 are respectively connected with 42, 37 of the singlechip U1, 41. Pin 38, pin 29 of the receiver U2 is connected with a voltage source VDD, and pins 30, 31 and 32 of the receiver U2 are connected and then grounded;
As shown in fig. 4, the CAN interface module includes a CAN transceiver U4, pins 1, 4 and 8 of the CAN transceiver U4 are respectively connected with pins 43, 44 and 60 of the single chip microcomputer U1, pin 2 of the CAN transceiver U4 is connected with one end of a capacitor C76 and is grounded, the other end of the capacitor C76 is connected with a3 pin and a 5V voltage source of the CAN transceiver U4, pin 6 of the CAN transceiver U4 is connected with pin 2 of the interface XS1, pin 7 of the CAN transceiver U4 is connected with one end of a resistor R49, pin 1 of the interface XS1 is connected with the other end of the resistor R49, and the data processing module is connected with a car body CAN bus through the CAN interface, so that complex control cables are omitted, cost is reduced, and electrical reliability is improved.
The working principle of the utility model is as follows: the tire monitoring module is used for respectively and correspondingly detecting the temperature, air pressure value and other information of the four tires, the information is transmitted to the radio frequency receiver circuit in a wireless mode, and the radio frequency receiver circuit transmits the collected data to the singlechip circuit for processing and then transmits the processed data to the central control display screen through the CAN interface module.
The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the scope of the present utility model are intended to be included in the scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.
Claims (4)
1. High accuracy tyre pressure monitoring controlling means, its characterized in that: the tire monitoring system comprises a tire monitoring module, wherein the tire monitoring module comprises four tire monitoring modules and has the same structure, the tire monitoring module is connected with a data processing module, the data processing module is connected with a central control display screen through a CAN interface module, and the data processing module comprises a radio frequency receiver circuit, a singlechip circuit and a power supply circuit for internal power supply;
The tire monitoring module comprises a tire pressure sensor U3, the tire pressure sensor U3 adopts an SP400 tire pressure sensor, 1, 2, 3 and 5 pins of the tire pressure sensor U3 are respectively connected with one end of a capacitor C23, one end of a capacitor C20, one end of a capacitor C21 and one end of a capacitor C22, the other ends of the capacitor C23, the capacitor C20, the capacitor C21 and the capacitor C22 are connected and then grounded, 6 pins of the tire pressure sensor U3 are connected with one end of a capacitor C19 and one end of a crystal oscillator G3, the other end of the capacitor C19 is grounded, the other end of the crystal oscillator G3 is connected with one end of a capacitor C24, one end of the other end of the crystal oscillator C24 is connected with one end of the capacitor C7 pin of the tire pressure sensor U3, one end of the capacitor C24 is grounded, one end of the other end of the capacitor C8 pin of the capacitor C5 is connected with one end of the capacitor R5, one end of the capacitor C27 is connected with one end of the inductor L5, the other end of the resistor R5, the other end of the capacitor C27 is connected with the other end of the capacitor C27, the other end of the inductor L5 is connected with the other end of the capacitor C21, the other end of the capacitor C22 is connected with the other end of the capacitor C21, the other end of the capacitor C22 is connected with one end of the capacitor C31, the other end of the capacitor C26, the other end of the capacitor C30 is connected with one end of the capacitor C26, the other end of the capacitor C30, and the other end of the capacitor C30 is connected with one end of the capacitor C30, and the other end of the capacitor C3.
2. The high-precision tire pressure monitoring and controlling device according to claim 1, wherein: the single-chip microcomputer circuit comprises a single-chip microcomputer U1, the single-chip microcomputer U1 adopts an STM8S208RB single-chip microcomputer, 1 pin of the single-chip microcomputer U1 is connected with one end of a resistor R2 and one end of a capacitor C1, the other end of the resistor R2 is connected with a 5V voltage source, the other end of the capacitor C1 is connected with one end of a resistor R4 and grounded, the other end of the resistor R4 is connected with 12 pins of the single-chip microcomputer U1, 6 pins of the single-chip microcomputer U4 are grounded through the capacitor C2, 4, 5, 20, 21 and 39 pins of the single-chip microcomputer U1 are grounded, 7, 8, 18, 19 and 40 pins of the single-chip microcomputer U1 are connected with 5V voltage sources, 37, 38, 41 and 42 pins of the single-chip microcomputer U1 are respectively connected with radio frequency receiver circuits, and 43, 44 and 60 pins of the single-chip microcomputer U1 are connected with the CAN interface module.
3. The high-precision tire pressure monitoring and controlling device according to claim 1, wherein: the radio frequency receiver circuit comprises a receiver U2, the receiver U2 adopts a MAX1471 receiver, a pin 1 of the receiver U2 is connected with one end of a capacitor C5 and one end of a resistor R3, the other end of the capacitor C5 is grounded, the other end of the resistor R3 is connected with one end of a capacitor C4 and one end of the receiver U2, a pin 3 of the receiver U2 is grounded through the capacitor C3, the other end of the capacitor C4 is connected with a pin 4 of the receiver U2, pins 5 and 6 of the receiver U2 are respectively connected with one end of a capacitor C14 and one end of a capacitor C15, the other end of the capacitor C14 and the other end of the capacitor C15 are connected with two ends of a crystal oscillator G1, a pin 7 of the receiver U2 is grounded through the capacitor C6, pins 8 and 9 of the receiver U2 are respectively connected with one end of an inductor L1 and one end of an inductor L3, the other end of the inductor L1 is grounded through the capacitor C7, and the other end of the inductor L3 is grounded, the capacitor is characterized IN that a pin 10 of the receiver U2 is connected with one end of a capacitor C11, one end of a capacitor C9 and one end of an inductor L2, the other end of the capacitor C11 is connected with the pin 11 of the receiver U2, the other end of the capacitor C9 is connected with one end of a capacitor C8, one end of the inductor L2, one end of the capacitor C10 and a voltage source VDD, the other end of the capacitor C10 is grounded, the other end of the capacitor C8 is connected with a pin 12 of the receiver U2, pins 13 and 16 of the receiver U2 are respectively connected with a pin IN and a pin OUT of a filter U6, a pin 14 of the receiver U2 is connected with one end of the capacitor C12 and the GND pin of the filter U4, the other end of the capacitor C12 is connected with a pin 15 of the receiver U2, pins 17, 18 and 23 of the receiver U2 are connected with one end of the capacitor C27, one end of the capacitor C23 is grounded, one end of the capacitor C27 is connected with one end of the resistor R8 and the 19 of the receiver U2, and the other end of the resistor R8 is connected with one end of the capacitor C22, the power supply is characterized in that the 20 feet of the receiver U2 are connected with the other end of the capacitor C22, the 22 feet of the receiver U2 are connected with the other end of the capacitor C23, the 24 feet of the receiver U2 and the voltage source VDD are connected with the other end of the capacitor C23, the 21 feet of the receiver U2 are grounded through the capacitor C21, the 25, 26, 27 and 28 feet of the receiver U2 are respectively connected with the 42, 37, 41 and 38 feet of the singlechip U1, the 29 feet of the receiver U2 are connected with the voltage source VDD, and the 30, 31 and 32 feet of the receiver U2 are grounded after being connected.
4. The high-precision tire pressure monitoring and controlling device according to claim 1, wherein: the CAN interface module comprises a CAN transceiver U4, pins 1, 4 and 8 of the CAN transceiver U4 are respectively connected with pins 43, 44 and 60 of the singlechip U1, a pin 2 of the CAN transceiver U4 is connected with one end of a capacitor C76 and is grounded, the other end of the capacitor C76 is connected with a pin 3 and a 5V voltage source of the CAN transceiver U4, a pin 6 of the CAN transceiver U4 is connected with a pin 2 of the interface XS1, a pin 7 of the CAN transceiver U4 is connected with one end of a resistor R49, and the other end of the resistor R49 is connected with a pin 1 of the interface XS 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322851237.8U CN220842095U (en) | 2023-10-24 | 2023-10-24 | High-precision tire pressure monitoring control device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322851237.8U CN220842095U (en) | 2023-10-24 | 2023-10-24 | High-precision tire pressure monitoring control device |
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| CN220842095U true CN220842095U (en) | 2024-04-26 |
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| CN202322851237.8U Active CN220842095U (en) | 2023-10-24 | 2023-10-24 | High-precision tire pressure monitoring control device |
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| CN (1) | CN220842095U (en) |
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2023
- 2023-10-24 CN CN202322851237.8U patent/CN220842095U/en active Active
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