An airborne wireless tire pressure monitoring device and system

Abstract

This invention discloses an airborne wireless tire pressure monitoring device and system. The device includes a temperature and pressure core, a control module, and a battery module. The control module is electrically connected to the temperature and pressure core and, upon receiving a signal acquisition command from the landing gear temperature and pressure monitoring control unit, controls the temperature and pressure core to acquire pressure and temperature data of the target tire. The control module also acquires the voltage signal from the battery module and converts the voltage signal into a battery percentage. Furthermore, the control module transmits the pressure data, temperature data, and battery percentage to the landing gear temperature and pressure monitoring control unit as radio frequency signals. The battery module powers the control module. The temperature and pressure core is fabricated using micro-nano technology from a metallic elastic device and a sensitive element. This invention solves the problem that existing airborne wireless tire pressure sensors cannot simultaneously monitor tire pressure on the aircraft and on the ground.

Description

Technical Field

[0001] This invention relates to the technical field of airborne wireless tire pressure monitoring, and more particularly to an airborne wireless tire pressure monitoring device and monitoring system. Background Technology

[0002] Under different load conditions, aircraft tires need to be matched with an appropriate tire pressure value based on the actual load conditions. This prevents tire blowouts during takeoff due to mismatched tire pressure and aircraft load, which could lead to excessive impact load on the tires. Furthermore, significant differences in tire pressure among the aircraft's tires create an imbalance, inevitably reducing the uniformity of wheel rotation speed during takeoff and consequently decreasing braking efficiency. Moreover, tire pressure differences can also cause asymmetrical landing gear load distribution, inducing undesirable vibrations. Therefore, timely tire pressure monitoring is crucial during aircraft maintenance to effectively eliminate and reduce unsafe factors during takeoff.

[0003] Currently, existing tire pressure monitoring devices include airborne wired tire pressure sensors and ground-based tire pressure sensors. Airborne wired tire pressure sensors allow pilots to monitor tire pressure directly in the cabin; however, when the aircraft is powered down, these sensors cannot be powered on and function properly, thus preventing real-time tire pressure monitoring. While ground-based tire pressure sensors can monitor tire pressure, they are bulky, cumbersome to operate, and inefficient, hindering ground staff from quickly monitoring and recording tire pressure, and resulting in significant aircraft maintenance time and costs.

[0004] Therefore, existing airborne wireless tire pressure sensors cannot simultaneously monitor tire pressure on the aircraft and on the ground. Summary of the Invention

[0005] This invention provides an airborne wireless tire pressure monitoring device and system, which solves the problem that existing airborne wireless tire pressure sensors cannot simultaneously monitor tire pressure on the aircraft and on the ground.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides an airborne wireless tire pressure monitoring device, the device comprising a temperature and pressure core, a control module, and a battery module; The control module is electrically connected to the temperature and pressure core and is used to control the temperature and pressure core to collect pressure and temperature data of the target tire after receiving a signal acquisition command sent by the landing gear temperature and pressure monitoring and control unit; the signal acquisition command is a frequency signal. The control module is also used to acquire the voltage signal of the battery module and convert the voltage signal into a power percentage; The control module is also used to transmit the pressure data, the temperature data and the power percentage to the landing gear temperature and pressure monitoring and control unit in the form of radio frequency signals; The battery module is used to power the control module; The thermo-pressure core is fabricated from a metal elastic device and a sensitive element using micro-nano technology.

[0007] In one possible implementation, the control module includes an RF communication monitoring unit, which is used to receive the signal acquisition command; The control module includes a deep sleep mode, a standby mode, and a working mode; In the deep sleep mode, the control module alternates between being in a sleep state for a first preset duration and in a listening state for a second preset duration. In the sleep state, the control module is completely inactive, and in the listening state, only the RF communication listening unit in the control module is active. The first preset duration is much longer than the second preset duration. In the standby mode, the control module alternates between being in sleep mode for a third preset duration and in listening mode for a second preset duration; the third preset duration is shorter than the first preset duration and longer than the second preset duration. Upon receiving the signal acquisition command in the monitoring state, the control module enters the working mode. In the working mode, the control module controls the temperature and pressure core to acquire the pressure data, the temperature data, and the battery module's charge percentage, and sends the acquired pressure data, temperature data, and charge percentage to the landing gear temperature and pressure monitoring and control unit.

[0008] In one possible implementation, the thermo-pressure core includes a first housing, a pressure-sensitive element, a temperature-sensitive element, a circuit board assembly, and PIN pins; The pressure-sensitive element, the temperature-sensitive element, and the circuit board assembly are all disposed inside the first housing. The circuit board assembly is used to fix the pressure-sensitive element and the temperature-sensitive element. One end of the PIN pin is connected to the circuit board assembly, and the other end extends out of the first housing. The pressure-sensitive element is used to convert the measured pressure into a pressure electrical signal; The temperature-sensitive element is used to convert the measured temperature into a temperature electrical signal.

[0009] In one possible implementation, the airborne wireless tire pressure monitoring device further includes a second housing, a main control circuit board, an antenna, and a battery compartment cover; The control module is fixed on the main control circuit board, and one end of the PIN pin extending outside the first housing is electrically connected to the main control circuit board. The PIN pins and the battery module are disposed opposite each other at both ends of the main control circuit board, and the antenna is connected to the main control circuit board; The second housing covers the outside of the main control circuit board and the battery module, and the second housing is used to insert one end of the PIN pin, which cooperates with the first housing to engage the PIN pin. The battery compartment cover is detachably snapped onto the other end of the second housing.

[0010] In one possible implementation, the control module is packaged using SiP chip technology.

[0011] In one possible implementation, the main control circuit board includes a motherboard, a flexible board, and an adapter board; The motherboard is a rigid plate used to fix the control module, and the motherboard is connected to the first housing by screws through multiple mounting holes. The adapter board is located on one side of the motherboard, and the adapter board is provided with pad holes that match the PIN pins; The flexible board is used to connect the electrical signals of the main board and the adapter board.

[0012] In one possible implementation, the first housing is encapsulated outside the core consisting of the pressure-sensitive element, the temperature-sensitive element, and the circuit board assembly using laser welding technology.

[0013] In one possible implementation, the metal elastic device is an elastic diaphragm, on which a Wheatstone bridge is sputtered to sense pressure signals, and a thin-film nickel resistance temperature sensing element is sputtered to sense temperature signals.

[0014] In one possible implementation, the thermo-pressure core further includes a pressure-applying base, which is a multi-layered cylindrical stepped structure.

[0015] Secondly, the present invention provides an airborne wireless tire pressure monitoring system, the system comprising a landing gear temperature and pressure monitoring control unit, and the airborne wireless tire pressure monitoring device described in any of the above claims.

[0016] In practical applications, the airborne wireless tire pressure monitoring device provided in this invention is installed on the nose landing gear wheel and / or main landing gear wheel of an aircraft. After receiving a frequency signal from the landing gear temperature and pressure monitoring control unit, the control module of the airborne wireless tire pressure monitoring device controls the temperature and pressure core to collect pressure and temperature data of the wheel, and simultaneously collects the voltage signal of the battery module, converting the voltage signal into a battery percentage. Then, the control module transmits the collected pressure data, temperature data, and battery percentage to the landing gear temperature and pressure monitoring control unit via radio frequency signals; and the battery module provides real-time power to the control module. This invention addresses the harsh installation environment of the aircraft landing gear by using an airborne wireless tire pressure monitoring device to test aircraft wheel pressure and temperature parameters and transmit them to the landing gear temperature and pressure monitoring control unit via radio frequency signals. Furthermore, the airborne wireless tire pressure monitoring device of this invention is battery-powered and can operate normally both during aircraft operation and when the aircraft is powered off, effectively solving the problem that existing airborne wired tire pressure sensors cannot simultaneously monitor tire pressure on-board and on the ground. Attached Figure Description

[0017] Figure 1 This is a schematic diagram illustrating the implementation principle of an airborne wireless tire pressure monitoring device according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the temperature and pressure core of an airborne wireless tire pressure monitoring device according to one embodiment of the present invention, wherein... Figure 2 (a), (b), (c), and (d) are respectively the front view, top view, cross-sectional view, and bottom view of the temperature and pressure core of the airborne wireless tire pressure monitoring device provided in this embodiment; Figure 3 This is a schematic diagram of the temperature and pressure core of an airborne wireless tire pressure monitoring device according to another embodiment of the present invention; wherein, Figure 3 (a), (b), (c), and (d) are respectively the front view, top view, cross-sectional view, and bottom view of the temperature and pressure core of the airborne wireless tire pressure monitoring device provided in this embodiment; Figure 4 This is a schematic diagram of the internal structure of an airborne wireless tire pressure monitoring device provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a temperature and pressure sensing element of an airborne wireless tire pressure monitoring device provided in an embodiment of the present invention; wherein, (a), (b), and (c) are a perspective view, a front view, and a cross-sectional view of the temperature and pressure sensing element of the temperature and pressure core, respectively; Figure 6 This is a schematic diagram of the internal structure of the temperature and pressure core of an airborne wireless tire pressure monitoring device provided in an embodiment of the present invention; Figure 7This is a schematic diagram of the pressure-applying base of the temperature and pressure core of an airborne wireless tire pressure monitoring device provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of an airborne wireless tire pressure monitoring device after the temperature pressure core and circuit board are connected, according to an embodiment of the present invention; wherein, (a) and (b) are a perspective view and a front view of the temperature pressure core and circuit board after they are connected, respectively; Figure 9 A schematic diagram of the main control circuit board of an airborne wireless tire pressure monitoring device provided in an embodiment of the present invention; wherein, (a) is a side view of the main control circuit board, and (b) is a front view of the main control circuit board; Figure 10 This is a perspective view and assembly structure diagram of the temperature and pressure core of an airborne wireless tire pressure monitoring device provided in an embodiment of the present invention.

[0018] Figure labels and figure descriptions: 1. Temperature and pressure core; 11. First housing; 12. Pressure-sensitive element; 13. Temperature-sensitive element; 14. Circuit board assembly; 15. Pin; 2. Control module; 3. Battery module; 4. Second housing; 5. Main control circuit board; 51. Main board; 52. Flexible board; 53. Adapter board; 6. Antenna; 7. Battery compartment cover; 8. Landing gear temperature and pressure monitoring and control unit. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more. Furthermore, the use of "based on" or "according to" implies openness and inclusiveness, because processes, steps, calculations, or other actions "based on" or "according to" one or more of the stated conditions or values ​​may in practice be based on additional conditions or beyond the stated values.

[0021] Currently, existing tire pressure monitoring devices include airborne wired tire pressure sensors and ground-based tire pressure sensors. Airborne wired tire pressure sensors allow pilots to monitor tire pressure directly in the cabin; however, when the aircraft is powered down, these sensors cannot be powered on and function properly, thus preventing real-time tire pressure monitoring. While ground-based tire pressure sensors can monitor tire pressure, they are bulky, cumbersome to operate, and inefficient, hindering ground staff from quickly monitoring and recording tire pressure, and resulting in significant aircraft maintenance time and costs.

[0022] Because the application scenarios for testing aircraft landing gear tire pressure parameters are harsh, there are high requirements for the size and reliability of sensors. However, the relevant technologies in the domestic aviation field are still in their infancy. According to the requirements of independent control, the product development is difficult and the demand is urgent.

[0023] To address the problem that existing airborne wired tire pressure sensors cannot simultaneously monitor tire pressure on the aircraft and on the ground, this invention provides an airborne wireless tire pressure monitoring device and system.

[0024] like Figure 1 As shown, in a first aspect, embodiments of the present invention provide an airborne wireless tire pressure monitoring device, which includes a temperature and pressure core 1, a control module 2, and a battery module 3.

[0025] The control module 2 is electrically connected to the temperature and pressure core 1 and is used to control the temperature and pressure core 1 to collect the pressure and temperature data of the target tire after receiving the signal acquisition command sent by the landing gear temperature and pressure monitoring and control unit 8.

[0026] The signal acquisition command is a frequency signal.

[0027] In this embodiment, the signal acquisition command is a preset radio frequency (RF) signal. Radio frequency (RF) is short for radio frequency current, which is a type of high-frequency alternating electromagnetic wave. It represents the electromagnetic frequency that can be radiated into space, with a frequency range of 300kHz to 300GHz. Alternating current that changes less than 1000 times per second is called low-frequency current, and that that changes more than 10000 times per second is called high-frequency current. Radio frequency is such a high-frequency current.

[0028] The control module 2 is also used to acquire the voltage signal of the battery module 3 and convert the voltage signal into a power percentage.

[0029] Control module 2 is also used to send pressure data, temperature data and power percentage to landing gear temperature and pressure monitoring control unit 8 in the form of radio frequency signals.

[0030] Specifically, control module 2 only sends an excitation signal to the temperature and pressure core 1 after receiving a signal acquisition command from the landing gear temperature and pressure monitoring control unit 8, thereby controlling the temperature and pressure core 1 to acquire temperature and pressure data. Specifically, control module 2 acquires the resistance signal of the temperature-sensitive element used for acquiring temperature data and the voltage signal of the pressure-sensitive element used for acquiring pressure data in the temperature and pressure core 1, and converts the acquired signals into electrical signals to obtain the pressure and temperature data of the target tire.

[0031] While collecting pressure and temperature data, control module 2 also collects the battery voltage of battery module 3 and converts the battery voltage into a percentage of charge.

[0032] The control module 2 is equipped with an RF transceiver chip, which transmits the collected pressure data, temperature data and battery percentage to the landing gear temperature and pressure monitoring and control unit 8.

[0033] Battery module 3 is used to power control module 2.

[0034] Specifically, due to the limitations of the installation environment, the airborne wireless tire pressure monitoring device is battery powered because it is installed on the nose landing gear wheel and / or the main landing gear wheel.

[0035] The thermo-pressure core 1 is fabricated from a metal elastic device and a sensitive element using micro-nano technology.

[0036] Specifically, this invention applies sputtering thin film technology to design a thermo-pressure core 1, which integrates a metal elastic device and a sensitive element into one under micro-nano technology. The process adopts deposition and photolithography processes in microelectronics, and the chip fabrication adopts "heterogeneous film formation" technology, which enables the thermo-pressure core 1 to have good long-term stability and reliability, small temperature drift, adaptability to a wide temperature range environment, high precision, and resistance to high overload pressure impact.

[0037] In practical applications, the airborne wireless tire pressure monitoring device provided in this embodiment of the invention is installed on the nose landing gear wheel and / or the main landing gear wheel of an aircraft. After receiving the frequency signal from the landing gear temperature and pressure monitoring control unit 8, the control module 2 of the airborne wireless tire pressure monitoring device controls the temperature and pressure core 1 to collect the pressure and temperature data of the wheel, and at the same time collects the voltage signal of the battery module 3, converts the voltage signal into a power percentage, and then sends the collected pressure data, temperature data and power percentage to the landing gear temperature and pressure monitoring control unit 8 in the form of radio frequency signals through the control module 2; and the battery module 3 supplies power to the control module 2 in real time.

[0038] This invention addresses the harsh installation environment of aircraft landing gear by using an airborne wireless tire pressure monitoring device to test aircraft wheel pressure and temperature parameters, and transmits these parameters to the landing gear temperature and pressure monitoring control unit 8 via radio frequency signals. Furthermore, the airborne wireless tire pressure monitoring device of this invention is battery powered and can operate normally both when the aircraft is running and powered off, effectively solving the problem that existing airborne wired tire pressure sensors cannot simultaneously monitor tire pressure on the aircraft and on the ground.

[0039] Given a fixed battery volume, the power output of battery module 3 is limited. In order to extend the working time of the airborne wireless tire pressure monitoring device, a strategy to reduce power consumption needs to be developed.

[0040] Furthermore, the control module 2 includes an RF communication monitoring unit, which is used to receive signal acquisition commands.

[0041] Control module 2 includes deep sleep mode, standby mode and working mode.

[0042] In deep sleep mode, control module 2 alternates between being in sleep mode for a first preset duration and in listening mode for a second preset duration.

[0043] In the sleep state, the control module 2 is completely inactive; in the listening state, only the RF communication listening unit in the control module 2 is active; the first preset duration is much longer than the second preset duration.

[0044] In standby mode, control module 2 alternates between sleeping for a third preset duration and listening for a second preset duration.

[0045] The third preset duration is less than the first preset duration but greater than the second preset duration.

[0046] After receiving a signal acquisition command in the monitoring state, the control module 2 enters the working mode. In the working mode, the control module 2 controls the temperature and pressure core 1 to collect pressure data, temperature data, and the battery percentage of the battery module 3, and sends the collected pressure data, temperature data, and battery percentage to the landing gear temperature and pressure monitoring and control unit 8.

[0047] Since the power consumption of control module 2 is in descending order as working mode, standby mode, and deep sleep mode, in order to save power and extend the service life of battery module 3, control module 2 listens for signal acquisition commands in a timely manner. If control module 2 in working mode does not listen to a signal acquisition command again within a first preset time interval, control module 2 automatically switches to standby mode; if control module 2 in standby mode does not listen to a signal acquisition command for a second preset time interval, control module 2 automatically switches to deep sleep mode.

[0048] The airborne wireless tire pressure monitoring device of the present invention has a standby time of more than 200 days, which meets the design requirements.

[0049] The temperature and pressure core 1 of the airborne wireless tire pressure monitoring device of the present invention includes Figure 2 , Figure 3 Two different external structures. One of them has... Figure 2 The thermo-pressure core 1, with its unique shape, can be used to collect thermo-pressure parameters of the hydraulic oil medium in aircraft landing gear buffers; it has... Figure 3 Thermo-pressure core 1 in terms of external structure Figure 2 Based on its external structure, it has a cylindrical protrusion with a height of 2mm and a diameter of 2.5mm, which also has the function of opening the valve core when collecting the tire pressure of the aircraft.

[0050] like Figure 5 As shown, in the fabrication of the thermo-pressure core 1 using a metal elastic device and a sensing element under micro-nano technology, the metal elastic device is further defined as an elastic diaphragm. A Wheatstone bridge is sputtered onto the elastic diaphragm to sense pressure signals, and a thin-film nickel resistance temperature sensing element is sputtered to sense temperature signals. Additionally, a temperature sensing element 13 can be disposed on the circuit board assembly 14 to sense temperature signals; this temperature sensing element 13 can be a PT100 plate platinum thermistor. In other words, this invention employs a dual-redundancy design for temperature measurement in the thermo-pressure core 1.

[0051] Specifically, a piezoresistive bridge (e.g., a Wheatstone bridge) is sputtered onto a metal substrate, and a thin-film strain gauge is fused with the elastomer using vacuum atomic thin-film deposition technology. Through modeling and numerical simulation of the metal elastic diaphragm, and based on a core algorithm-based multi-parameter convex optimization mathematical model, the thickness L of the elastic diaphragm is calculated, forming the most sensitive micro-bridge circuit. Simultaneously, a thin-film nickel resistance temperature sensing element is sputtered onto the elastic diaphragm. Due to the full contact between the diaphragm and the fluid medium, this thin-film nickel resistance temperature sensing element can quickly respond to changes in the medium's temperature, measuring the true temperature of the medium in real time.

[0052] Therefore, by using high overload resistance and high adhesion to suppress thin film deposition technology, the pressure overload capacity of this temperature and pressure sensitive element can be increased by 3 to 5 times.

[0053] like Figure 6 As shown, the thermo-pressure core 1 further includes a first housing 11, a pressure-sensitive element 12, a temperature-sensitive element 13, a circuit board assembly 14, and a PIN pin 15.

[0054] The pressure-sensitive element 12, the temperature-sensitive element 13, and the circuit board assembly 14 are all disposed inside the first housing 11. The circuit board assembly 14 is used to fix the pressure-sensitive element 12 and the temperature-sensitive element 13. One end of the PIN pin 15 is connected to the circuit board assembly 14, and the other end extends out of the first housing 11.

[0055] The pressure-sensitive element 12 is used to convert the measured pressure into a pressure electrical signal, and the temperature-sensitive element 13 is used to convert the measured temperature into a temperature electrical signal.

[0056] The first housing 11 is used to protect the pressure-sensitive element 12, the temperature-sensitive element 13, and the circuit board assembly 14.

[0057] One end of the first housing 11 is provided with a PIN pin 15 for electrical connection with the control module 2, and the other end of the first housing 11 is detachably connected to the landing gear wheel and / or the main landing gear wheel through an externally provided external thread.

[0058] In this embodiment, the external thread is an MJ18×1.5 thread.

[0059] In this embodiment, the pressure-sensitive element 12 is packaged as a metal-based pressure-sensitive chip, which can meet high overall accuracy over a wide pressure range and has advantages such as resistance to long-term fatigue, wide temperature range, resistance to high-multiple overload impacts, good stability, and high reliability. The metal-based pressure-sensitive chip is fabricated directly on the metal substrate using MEMS technology, with the strain gauge bridge directly fabricated on the metal substrate using micro-nano technology. Through the elastic deformation of the substrate under stress, the chip outputs a mV-level voltage signal that is linearly related to the measured pressure, realizing accurate and rapid measurement of the measured pressure.

[0060] The pressure measurement of the pressure sensing element 12 uses an equal-arm differential Wheatstone bridge as the sensing circuit to obtain the highest sensitivity and output linearity.

[0061] The temperature sensing element 13 uses a PT100 platinum thermistor to achieve temperature sensing. Its temperature measurement principle is based on the fact that the resistance of platinum changes with ambient temperature. Furthermore, the temperature change relationship of the platinum thermistor is very stable. It has the advantages of stable chemical and physical properties and accurate temperature measurement within the measurement range; good output characteristics and a good linear relationship between resistance and temperature within the measurement range; and high resistivity, small size, and small weight.

[0062] Furthermore, the first housing 11 is encapsulated on the outside of the core, which consists of a pressure-sensitive element 12, a temperature-sensitive element 13, and a circuit board assembly 14, using laser welding technology.

[0063] Specifically, the core is packaged using laser welding (side circumferential welding and planar circumferential welding) technology, which not only achieves high airtightness, high isolation and low stress of the temperature-pressure core 1, but also conforms to the external shell structure of the control module 2 to form an integrated design.

[0064] The weight of the temperature-pressure core 1 is ≤8g.

[0065] The pressure resistance of the pressure-sensitive element 12 is greater than or equal to 3 to 5 times the maximum range of the pressure-sensitive element 12.

[0066] Furthermore, such as Figure 4 , Figure 6 As shown, the airborne wireless tire pressure monitoring device also includes a second housing 4, a main control circuit board 5, an antenna 6, and a battery compartment cover 7.

[0067] The control module 2 is fixed on the main control circuit board 5, and the end of the PIN pin 15 extending out of the first housing 11 is electrically connected to the main control circuit board 5.

[0068] The PIN pin 15 and the battery module 3 are positioned opposite each other at both ends of the main control circuit board 5, and the antenna 6 is connected to the main control circuit board 5.

[0069] The second housing 4 is covered outside the main control circuit board 5 and the battery module 3, and the second housing 4 is used to insert one end of the PIN pin 15, which cooperates with the first housing 11 to engage with one end of the PIN pin 15.

[0070] The battery compartment cover 7 is detachably snapped onto the other end of the second housing 4.

[0071] Specifically, the battery compartment cover 7 is detachably connected to the second housing 4, making it easy for users to replace the battery module 3.

[0072] In this embodiment, the antenna 6 is designed as a π-type PCB trace antenna with a center frequency of 433MHz and a 50Ω impedance matching input design. The antenna 6 is located on the circuit board above the battery. The circuit board and the battery are located in the battery compartment together. The top shell parts of the battery compartment are made of PEEK polyether ether ketone polymer composite material.

[0073] Furthermore, the control module 2 is packaged using SiP chip technology.

[0074] SiP chip technology is a 3D system integration and packaging technology that combines active and passive components with different functions, such as the main control MCU, high-precision ADC, and long-range wireless communication IC, into a single package to obtain SiP control module 2. This not only effectively utilizes three-dimensional space, reduces package size, and achieves highly integrated circuits, but also improves transmission speed and further reduces power consumption. Simultaneously, SiP design has excellent electromagnetic interference suppression capabilities. SiP control module 2 reserves corresponding general-purpose I / O ports, programming ports, and serial ports.

[0075] Specifically, due to the complex internal structure of the airborne wireless tire pressure monitoring device, the space left for the main control circuit board 5 is relatively small. Therefore, this invention utilizes SiP chip technology to perform three-dimensional packaging of the components in the control module 2, further reducing the size of the airborne wireless tire pressure monitoring device.

[0076] Furthermore, such as Figure 7 , Figure 8 As shown, the thermo-pressure core also includes a pressure-inducing base, which is a multi-layered cylindrical stepped structure.

[0077] In this embodiment of the invention, the pressure base is a coaxial, six-layer cylindrical stepped structure with gradually increasing diameter, consisting of step 1, step 2, step 3, step 4, step 5, and step 6 from top to bottom. Steps 1, 3, and 6 have small chamfers on their outer edges to facilitate smooth insertion of parts during installation. The roots of steps 1, 3, and 6 are cleaned to ensure accurate placement of parts and guarantee dimensional and positional tolerances. The outer edges of steps 2 and 4 maintain right angles for laser welding with other parts. The lower outer edge of step 6 also maintains a right angle for laser welding of its end face.

[0078] Step 1 is used to install temperature and pressure sensitive elements, and works in conjunction with step 2 to accurately place the sensitive elements and define their position.

[0079] Step 2 maintains a right angle and is integrated with the outer cylindrical surface of the sensitive element's housing via laser welding. This ensures that the weld seam is furthest from the elastic diaphragm of the sensitive element, and the welding stress does not affect the pressure measurement. Combined with the cap-like design of the outer circumference of the temperature and pressure sensitive element, reasonable space is provided for the weld seam, preventing it from contacting other parts during subsequent assembly and avoiding external forces acting on the weld seam.

[0080] Step 3 is used to place the metal casing, which works in conjunction with step 4 to accurately place and define the position. The metal casing is a thin-walled cylindrical shape that covers the outer circumference of the temperature and pressure sensitive element and provides protection. One end is equipped with a fixed circuit board for bonding the lead wire, and the other end is laser-welded to the right-angle side of step 4 of the pressure base.

[0081] The diameter of step 5 is slightly larger than the diameter of the weld at step 4. This protects the weld from contact with other parts and from external forces during subsequent assembly.

[0082] In the high-pressure, high-dynamic-load environment of aircraft hydraulic systems, pressure pulses (water hammer effect) act on the precision pressure-sensing diaphragm of the pressure sensor. To avoid damage to the sensor, the design of the sensor pressure-sensing pipeline is crucial.

[0083] The pressure-sensing base has four pressure-sensing holes at its bottom, with the axis of each hole forming a 45° angle with the plane of the base, creating four oblique cylindrical cavities that intersect with the main pipe cavity. This allows the measured medium to be introduced into the pressure-sensing chamber, ensuring full contact with the elastic diaphragm. The four pressure-sensing holes restrict the fluid velocity and flow rate towards the sensor diaphragm; when a pressure pulse arrives, the energy of the pressure wave is dissipated by the oblique cavities, resulting in a smoother pulse pressure transmitted to the diaphragm.

[0084] The multi-layered cylindrical stepped pressure base of this invention provides damping and pressure equalization, reducing the rate of pressure change, lowering the peak pressure transmitted to the diaphragm, and preventing damage to the elastic diaphragm. This structure does not increase the sensor's external dimensions and does not require additional space or sealing during pressure testing. It is simple to manufacture, offers significant pressure reduction and throttling effects, and is cost-effective.

[0085] Furthermore, such as Figure 8 As shown, the temperature and pressure sensing element has a ring-shaped circuit board, a metal shell, and an insulator around its outer circumference. The height of the circuit board is flush with the elastic diaphragm, and the circuit board has pads for bonding metal wires. The metal shell has three protrusions on its edge, which can be flipped and riveted to the surface of the circuit board and soldered to the pads, thereby fixing the ring-shaped circuit board in place, ensuring that the circuit board will not shift, guaranteeing the stable and reliable bonding of the metal wires, and thus ensuring the stability of the temperature and pressure parameter signal.

[0086] Electrical isolation between the circuit board and the metal casing is achieved through a ring-shaped insulator, ensuring excellent insulation performance. The circuit board has pins for transmitting electrical signals, and the tips of these pins have steps to allow for the placement of another circuit board for soldering to the pads. This step design ensures the other circuit board is placed stably and maintains a uniform distance from the ring-shaped circuit board.

[0087] like Figure 9 As shown, the main control circuit board 5 further includes a main board 51, a flexible board 52, and an adapter board 53.

[0088] The main board 51 is a rigid plate used to fix the control module 2, and the main board 51 is connected to the first housing 11 by screws through multiple mounting holes.

[0089] The adapter board 53 is located on one side of the main board 51, and the adapter board 53 has pad holes that match the PIN pin 15.

[0090] The flexible board 52 is used to connect the electrical signals of the main board 51 and the adapter board 53.

[0091] In this embodiment, the main control circuit board 5 adopts a design combining rigid and flexible boards, consisting of a main board 51, a flexible board 52, and an adapter board 53. The main board 51 is used to fix the SiP control module 2 and peripheral circuits, and is fixed to the housing of the thermoelectric core 1 with screws through three mounting holes. The adapter board 53 has multiple solder pad holes, and the wiring definitions correspond to the PIN pins 15 of the thermoelectric core 1. Electrical connection with the thermoelectric core 1 is achieved by soldering to the PIN pins 15. The function of the flexible board 52 is to connect the electrical signals of the main board 51 and the adapter board 53; and the flexible board 52 can be flipped and bent, which has a certain degree of flexibility, allowing the main board 51 and the adapter board 53 to be slightly rotated and adjusted in position when connected to the thermoelectric core 1, which is conducive to multi-functional installation in narrow and complex spaces.

[0092] like Figure 10 As shown, the temperature pressure monitoring core of the airborne wireless tire pressure monitoring device of the present invention is compact in size and can be adapted to various types of housing parts, forming an integrated structure through laser welding; it can be embedded inside the interface thread, leaving maximum space inside the sensor, enabling further miniaturization of the sensor. The outer circumference of the temperature pressure monitoring core is designed with steps, which become important load-bearing points when subjected to fluid medium pressure, avoiding the weld seam being in a unidirectional load-bearing state, and greatly improving structural strength and reliability.

[0093] Secondly, embodiments of the present invention also provide an airborne wireless tire pressure monitoring system, the system including a landing gear temperature and pressure monitoring control unit, and the airborne wireless tire pressure monitoring device described in any of the above.

[0094] The landing gear temperature and pressure monitoring and control unit is used not only to send signal acquisition commands to the airborne wireless tire pressure monitoring device, but also to receive pressure data, temperature data and battery percentage sent by the airborne wireless tire pressure monitoring device.

[0095] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the system described above can be referred to the corresponding process in the foregoing device embodiments, and will not be repeated here.

[0096] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An airborne wireless tire pressure monitoring device, characterized in that, This includes the temperature and pressure core, control module, and battery module; The control module is electrically connected to the temperature and pressure core and is used to control the temperature and pressure core to collect pressure and temperature data of the target tire after receiving a signal acquisition command sent by the landing gear temperature and pressure monitoring and control unit; the signal acquisition command is a frequency signal. The control module is also used to acquire the voltage signal of the battery module and convert the voltage signal into a power percentage; The control module is also used to transmit the pressure data, the temperature data and the power percentage to the landing gear temperature and pressure monitoring and control unit in the form of radio frequency signals. The battery module is used to power the control module; The thermo-pressure core is fabricated from a metal elastic device and a sensitive element using micro-nano technology. The temperature-pressure core also includes a pressure-applying base, which has a multi-layered cylindrical stepped structure. The pressure-sensing base is a coaxial, six-layer cylindrical stepped structure with gradually increasing diameter, consisting of step 1, step 2, step 3, step 4, step 5, and step 6 from top to bottom. Steps 1, 3, and 6 have small chamfers on their outer edges for easy insertion of parts during installation. The lower outer edge of step 6 maintains a right angle for laser welding of its end face. Step 1 is used to mount the temperature and pressure sensitive element and mates with step 2. Step 2 maintains a right angle and is laser-welded to the outer cylindrical surface of the sensitive element's housing. Step 3 is used to place the metal outer shell and mates with step 4. The diameter of step 5 is slightly larger than the diameter at the weld seam of step 4.

2. The airborne wireless tire pressure monitoring device according to claim 1, characterized in that, The control module includes an RF communication monitoring unit, which is used to receive the signal acquisition command. The control module includes a deep sleep mode, a standby mode, and a working mode; In the deep sleep mode, the control module alternates between being in a sleep state for a first preset duration and in a listening state for a second preset duration. In the sleep state, the control module is completely inactive, and in the listening state, only the RF communication listening unit in the control module is active. The first preset duration is much longer than the second preset duration. In the standby mode, the control module alternates between sleeping for a third preset duration and listening for a second preset duration. The third preset duration is less than the first preset duration and greater than the second preset duration; Upon receiving the signal acquisition command in the monitoring state, the control module enters the working mode. In the working mode, the control module controls the temperature and pressure core to acquire the pressure data, the temperature data, and the battery module's charge percentage, and sends the acquired pressure data, temperature data, and charge percentage to the landing gear temperature and pressure monitoring and control unit.

3. The airborne wireless tire pressure monitoring device according to claim 2, characterized in that, The thermo-pressure core includes a first housing, a pressure-sensitive element, a temperature-sensitive element, a circuit board assembly, and PIN pins; The pressure-sensitive element, the temperature-sensitive element, and the circuit board assembly are all disposed inside the first housing. The circuit board assembly is used to fix the pressure-sensitive element and the temperature-sensitive element. One end of the PIN pin is connected to the circuit board assembly, and the other end extends out of the first housing. The pressure-sensitive element is used to convert the measured pressure into a pressure electrical signal; The temperature-sensitive element is used to convert the measured temperature into a temperature electrical signal.

4. The airborne wireless tire pressure monitoring device according to claim 3, characterized in that, The airborne wireless tire pressure monitoring device also includes a second housing, a main control circuit board, an antenna, and a battery compartment cover; The control module is fixed on the main control circuit board, and one end of the PIN pin extending outside the first housing is electrically connected to the main control circuit board. The PIN pins and the battery module are disposed opposite each other at both ends of the main control circuit board, and the antenna is connected to the main control circuit board; The second housing covers the outside of the main control circuit board and the battery module, and the second housing is used to insert one end of the PIN pin, which cooperates with the first housing to engage the PIN pin. The battery compartment cover is detachably snapped onto the other end of the second housing.

5. The airborne wireless tire pressure monitoring device according to claim 4, characterized in that, The control module is packaged using SiP chip technology.

6. The airborne wireless tire pressure monitoring device according to claim 5, characterized in that, The main control circuit board includes a motherboard, a flexible board, and an adapter board; The motherboard is a rigid plate used to fix the control module, and the motherboard is connected to the first housing by screws through multiple mounting holes. The adapter board is located on one side of the motherboard, and the adapter board is provided with pad holes that match the PIN pins; The flexible board is used to connect the electrical signals of the main board and the adapter board.

7. The airborne wireless tire pressure monitoring device according to claim 3, characterized in that, The first housing is encapsulated on the outside of the core, which is composed of the pressure-sensitive element, the temperature-sensitive element, and the circuit board assembly, using laser welding technology.

8. The airborne wireless tire pressure monitoring device according to claim 1, characterized in that, The metal elastic device is an elastic diaphragm. A Wheatstone bridge is sputtered onto the elastic diaphragm to sense pressure signals, and a thin-film nickel resistance temperature sensing element is sputtered to sense temperature signals.

9. An airborne wireless tire pressure monitoring system, characterized in that, It includes a landing gear temperature and pressure monitoring control unit, and an airborne wireless tire pressure monitoring device as described in any one of claims 1-8.

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