WO2022041043A1

WO2022041043A1 - Internet of things technology-based remote balance-testing system and method for vehicle

Info

Publication number: WO2022041043A1
Application number: PCT/CN2020/111739
Authority: WO
Inventors: 陈勇; 李隽诗; 李凯; 田敏; 徐建俊; 李洪昌; 冷育荣; 顾振飞; 张律
Original assignee: 南京龙渊微电子科技有限公司; 江苏意渊工业大数据平台有限公司; 南京泰慧联电子科技有限公司
Priority date: 2020-08-26
Filing date: 2020-08-27
Publication date: 2022-03-03
Also published as: CN112161721A

Abstract

An Internet of Things technology-based remote balance-testing system and method for a vehicle. The system comprises an acoustic wave positioning unit, an acoustic wave temperature measurement unit, a balance measurement unit, and a network transmission unit. The acoustic wave positioning unit determines that an acoustic wave emitter and an acoustic wave receiver are located at the same horizontal position. The acoustic wave temperature measurement unit comprises the acoustic wave emitter and the acoustic wave receiver, which are installed at the same horizontal height on the housing of a vehicle; the installation distance is adjusted according to vehicle model size, and the ambient temperature at said horizontal height in a current direction is measured by calculating the propagation speed of acoustic waves in the air. The balance measurement unit determines the current vehicle balance state by calculating whether temperature differences are present in the ambient temperature of the housing along various directions at said same horizontal height. The data transmission unit updates a balance observation data record every day, and sends the balance observation data record to a cloud end for storage. In the present system, after vehicle production, ambient temperature is measured by means of acoustic waves, and the vehicle balance state is determined according to whether ambient temperature differences are present, thus avoiding direct effects of external heat sources.

Description

A vehicle remote balance detection system and method based on Internet of Things technology

technical field

The invention relates to sound wave temperature measurement, and belongs to the field of vehicle balance detection.

Background technique

Vehicle balance observation is to measure the skeleton support of the vehicle itself, so as to understand whether the vehicle is supported and deformed due to the uneven pressure of the load over time. During the production stage, the vehicle may experience support deformation due to increased load, or support deformation due to long-term uneven stress after leaving the factory, causing the vehicle to lose its balance and the center of gravity to shift, which will eventually cause the vehicle to appear. Tilt, serious or even cause a car accident. Therefore, it is more and more important to check the balance of the vehicle. Especially in vehicles that carry heavy loads for a long time, some freight vehicles carry loads for a long time, and the placement of goods often leads to uneven stress on the vehicles, and even some truck drivers have serious overloading behavior in order to increase the load capacity. , The bus also needs special attention in this regard because it carries a large number of passengers' lives. It is difficult to judge the balance state of the vehicle by human observation, but if it is ignored, there is a serious potential safety hazard, and the existing detection device is expensive, and it cannot timely alarm and remind the owner of the vehicle.

In reality, the balance test of the vehicle is mostly in the production stage, but it is not checked after the vehicle leaves the factory, so that the balance offset of the vehicle due to the impact of the use environment is ignored over the years, and the impact of the vehicle problem is still in use. middle. At the same time, the detection methods of different heights cannot be the same when the vehicle shape is very different. When the ambient temperature detection is used as the basis for judging the balance of the vehicle, the infrared temperature measurement will be affected when the surrounding is full of heat sources.

technical problem

A vehicle remote balance detection system and method based on the Internet of Things technology is provided to solve the above problems.

technical solutions

A vehicle remote balance detection system based on the Internet of Things technology, comprising a sound wave positioning unit, a sound wave temperature measurement unit, a balance measurement unit and a network transmission unit;

The sound wave positioning unit determines that the sound wave transmitter and the sound wave receiver are in the same horizontal position;

The sound wave temperature measurement unit, including the sound wave transmitter and the sound wave receiver, is installed at the same level of the vehicle shell, and the installation distance is adjusted according to the size of the vehicle. By calculating the sound wave propagation speed in the air, the ambient temperature in the current direction and the level height is measured;

The balance measurement unit judges the current vehicle balance state by calculating whether there is a temperature difference in the ambient temperature at the same level in each direction of the vehicle shell;

The data transmission unit updates the balance observation data record every day and sends it to the cloud for storage.

According to one aspect of the present invention, in the acoustic wave positioning unit, the acoustic wave transmitter and the acoustic wave receiver can be connected, and each has a fixed structure on the back. The distance from the ground is determined by the acoustic wave ranging, and the same horizontal height is maintained, and then installed separately according to the size of the vehicle.

According to an aspect of the present invention, the acoustic wave temperature measurement unit includes an acoustic wave transmitting circuit, including a frequency modulation oscillation module and an excitation amplification module;

The frequency modulation oscillation module includes capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, inductor L1, diode D1, crystal oscillator X1 and transistor Q1;

One end of the capacitor C1 is connected to the input signal, the other end of the capacitor C1 is respectively connected to one end of the resistor R1, one end of the resistor R2 and one end of the resistor R3, and the other end of the resistor R2 is connected to the other end of the resistor R1. One end of the capacitor C2, one end of the resistor R5 and one end of the resistor R6 are all connected to the power supply voltage, and the other end of the resistor R3 is connected to the anode of the diode D1, one end of the capacitor C3, and the capacitor C5 One end of the resistor R7 and one end of the resistor R7 are both grounded, and the other end of the resistor R1 is respectively connected to one end of the inductor L1, one end of the resistor R4, the cathode of the diode D1 and the other end of the capacitor C3. , the other end of the inductor L1 is respectively connected to the other end of the resistor R4 and one end of the crystal oscillator X1, and the other end of the crystal oscillator X1 is respectively connected to the other end of the resistor R5 and the base of the transistor Q1 is connected to one end of the capacitor C4, the collector of the transistor Q1 is connected to the other end of the resistor R6, and the emitter of the transistor Q1 is respectively connected to the other end of the capacitor C4 and the other end of the capacitor C5 , the other end of the resistor R7 is connected to one end of the capacitor C6;

The excitation and amplification module includes resistor R8, resistor R9, resistor R10, capacitor C7, capacitor C8, capacitor C9, capacitor C10, capacitor C11, capacitor C12, capacitor C13, capacitor C14, capacitor C15, capacitor C16, capacitor C17, capacitor C18, Capacitor C19, Capacitor C20, Capacitor C21, Capacitor C22, Transistor Q2, Transistor Q3, Inductor L2, Inductor L3, Inductor L4, Inductor L5, Inductor L6, Inductor L7, Inductor L8, Inductor L9, Inductor L10 and Acoustic Transmitter Z1;

The other end of the capacitor C6 is respectively connected to one end of the resistor R8, one end of the resistor R9, one end of the capacitor C7 and the base of the transistor Q2, and the other end of the resistor R9 is respectively connected to the One end of the inductor L2, one end of the capacitor C10, one end of the capacitor C11 and one end of the inductor L3 are connected, the other end of the capacitor C10 and the other end of the capacitor C11 are both grounded, and the resistor R8 is connected to the ground. The other end and the other end of the capacitor C7, the emitter of the transistor Q2, one end of the capacitor C9, one end of the inductor L5, one end of the capacitor C16, one end of the capacitor C17, the capacitor One end of C18, one end of the capacitor C20 and one end of the acoustic wave transmitter Z1 are all grounded, and the collector of the transistor Q2 is connected to the other end of the inductor L2 and one end of the capacitor C8, respectively. The other end of C8 is respectively connected to the other end of the capacitor C9 and one end of the inductor L4, and the other end of the inductor L4 is respectively connected to the other end of the inductor L5, one end of the resistor R10 and the transistor Q3 The base of the resistor R10 is connected to the emitter of the transistor Q3, the collector of the transistor Q3 is connected to one end of the inductor L6, the other end of the capacitor C16 and the capacitor C15 One end of the inductor L6 is connected to the other end of the inductor L3, one end of the capacitor C12, one end of the capacitor C13 and one end of the capacitor C14 are all connected to the power supply voltage, and the capacitor C12 is connected to the power supply voltage. The other end of the capacitor C13 and the other end of the capacitor C14 are both grounded, one end of the capacitor C15 is connected to one end of the inductor L7, and the other end of the inductor L7 is respectively connected to the capacitor C17. The other end is connected to one end of the inductor L8, the other end of the inductor L8 is respectively connected to the other end of the capacitor C18 and one end of the capacitor C19, and the other end of the capacitor C19 is respectively connected to the other end of the inductor L10. One end of the capacitor C21 is connected to one end, the other end of the inductor L10 is connected to one end of the capacitor C20, and the other end of the capacitor C21 is connected to one end of the inductor L9 and one end of the capacitor C22 respectively. The other end of the inductor L9 is respectively connected to the other end of the capacitor C22 and the other end of the acoustic wave transmitter Z1.

According to one aspect of the present invention, the acoustic wave temperature measurement unit includes an acoustic wave receiving circuit, including a detection amplifier module and a power amplifier module;

The detection and amplification module includes an acoustic wave receiver Z2, a triode Q4, a triode Q5, a capacitor C23, a capacitor C24, a capacitor C25, a capacitor C26, a resistor R11, a resistor R12, a resistor R13 and a potentiometer RV1;

One end of the acoustic wave receiver Z2 is connected to the base of the transistor Q4, and the other end of the acoustic wave receiver Z2 is connected to one end of the capacitor C24, the second pin of the potentiometer RV1, the capacitor C25 One end of the transistor Q5 and the emitter of the transistor Q5 are both grounded, the collector of the transistor Q4 is respectively connected to one end of the capacitor C23 and one end of the resistor R11, the other end of the capacitor C23 is grounded, and the transistor Q4 The emitters are respectively connected to the other end of the capacitor C24 and one end of the resistor R12, the other end of the resistor R12 is connected to the first pin of the potentiometer RV1, the third lead of the potentiometer RV1 The pins are respectively connected to the other end of the capacitor C25 and one end of the capacitor C26, the other end of the capacitor C26 is respectively connected to one end of the resistor R13 and the base of the transistor Q5, and the other end of the resistor R11 One end is connected to the other end of the resistor R13;

The power amplification module includes a transformer TR1, a transformer TR2, a capacitor C27, a capacitor C28, a capacitor C29, a transistor Q6, a transistor Q7, a resistor R14, a resistor R15 and a diode D2;

The first pin of the transformer TR1 is respectively connected to the other end of the resistor R11, the other end of the resistor R13, one end of the capacitor C27, one end of the resistor R14 and one end of the resistor R15, so The other end of the capacitor C27 is grounded, the second pin of the transformer TR1 is connected to the collector of the transistor Q5, the third pin of the transformer TR1 is connected to one end of the capacitor C28, and the The fourth pin is connected to the base of the transistor Q6, the fifth pin of the transformer TR1 is respectively connected to the other end of the resistor R14 and the anode of the diode D2, and the cathode of the diode D2 is connected to the The emitter of the transistor Q6, the emitter of the transistor Q7 and the fifth pin of the transformer TR2 are all grounded, the sixth pin of the transformer TR1 is connected to the base of the transistor Q7, and the The seventh pin is connected to one end of the capacitor C29, the collector of the transistor Q6 is respectively connected to the other end of the capacitor C28 and the first pin of the transformer TR2, and the collector of the transistor Q7 is respectively connected to The other end of the capacitor C29 is connected to the third pin of the transformer TR2, the second pin of the transformer TR2 and the other end of the resistor R15 are both connected to the power supply voltage, and the fourth pin of the transformer TR2 Connect the sound wave signal.

According to one aspect of the present invention, the acoustic wave temperature measuring unit calculates the acoustic wave velocity through a fixed distance between the acoustic wave transmitter and the acoustic wave receiver, and determines the ambient temperature according to the difference in the acoustic wave transmission velocity in the air at different temperatures.

According to one aspect of the present invention, the balance measurement unit determines the balance state of the vehicle by comparing the ambient temperature at the same level measured by the vehicle shell in different directions according to the change of the ambient temperature with the horizontal height.

According to one aspect of the present invention, the data transmission unit includes a data recording module, which records the measurement data in real time and overwrites the old data, regularly uploads the cloud records every day, and integrates the database in the cloud.

A vehicle balance detection method based on sound wave temperature measurement, the specific steps include:

Step 1. After connecting the sonic transmitter and the sonic receiver, install them on the vehicle shell to determine the height from the ground through sonic ranging, and then separately install the sonic transmitter and the sonic receiver on both ends of the shell;

Step 2, the sound wave receiver receives the sound wave signal emitted by the sound wave transmitter, and measures the sound wave speed from a fixed installation distance, and measures the ambient temperature of the height according to the different propagation speeds of the sound wave in the air of different temperatures;

Step 3. Compare the ambient temperature measured at the same horizontal height on the casing in different directions, according to the decrease of the ambient temperature with the increase of the height, and determine the balance state of the vehicle through the ambient temperature difference;

Step 4. Update the measurement data in real time, upload the data to the cloud record according to the set time every day, integrate the database in the cloud, and compare the database with the data change interval of the last 30 days. When there is an unbalanced data record, the cloud will send an alarm The signal is sent to the smart terminal bound by the owner.

According to one aspect of the present invention, sound wave transmitters and sound wave receivers of the same height are installed at different heights of the vehicle shell.

beneficial effect

By detecting the ambient temperature at the same height, the invention judges the balance state of the vehicle according to whether there is a temperature difference in the environment. After the vehicle leaves the factory, it can be detected whether there is a support failure in use, so as to avoid the problem that the vehicle is difficult to detect after leaving the factory. Temperature measurement to avoid the occurrence of infrared temperature measurement in extreme environments that interfere with heat sources around the vehicle.

Description of drawings

FIG. 1 is a system block diagram of a vehicle remote balance detection system based on the Internet of Things technology of the present invention.

FIG. 2 is a schematic diagram of the acoustic wave transmitting circuit of the present invention.

FIG. 3 is a schematic diagram of the acoustic wave receiving circuit of the present invention.

Embodiments of the present invention

Example 1

The traditional method of vehicle balance detection is mainly in the production stage, but it is not checked after the vehicle leaves the factory, so that the balance offset caused by the impact of the use environment of the vehicle over the years is ignored, and the impact of the vehicle problem is all in the Using. The invention judges the balance of the vehicle by detecting the temperature of the surrounding environment. When the temperature of the surrounding environment is consistent, the vehicle is in a balanced state, and when there is a temperature difference in the surrounding environment, it means that the vehicle has settled. Especially in the vehicles that carry heavy loads for a long time, some freight vehicles carry loads for a long time, and the placement of the goods often causes uneven stress on the vehicles, and even some truck drivers have serious overloading behavior in order to increase the load capacity. Buses also need extra attention in this regard because they carry a large number of passengers' lives.

In this embodiment, as shown in FIG. 1 , a vehicle remote balance detection system based on the Internet of Things technology includes a sound wave positioning unit, a sound wave temperature measurement unit, a balance measurement unit and a network transmission unit;

In a further embodiment, the acoustic wave transmitter and the acoustic wave receiver are connected first, and then installed on the edge of a certain side of the vehicle shell through a detachable connection device behind, and the acoustic wave ranging is performed by the acoustic wave transmitter and the acoustic wave receiver itself. Confirm the height from the ground, and then disassemble the two independent connecting devices behind and keep one of them on the shell, and install the connected acoustic wave transmitter and acoustic wave receiver on the other horizontally opposite edge of the vehicle shell through the other remaining connecting device. , perform the sound wave distance measurement again to confirm the height from the ground, adjust the height to be the same as the connection device left before, confirm that the height is unified, separate the sound wave transmitter and sound wave receiver, and connect the sound wave transmitter and sound wave receiver to the two sides respectively. The connection device is fixed to detect the ambient temperature of the vehicle shell, because it is necessary to determine whether the vehicle is tilted by detecting the ambient temperature at the same height.

In a further embodiment, the acoustic wave transmitter and the acoustic wave receiver are installed on each shell of the vehicle in combination to ensure that the ambient temperature of each shell of the vehicle is detected, and the acoustic wave transmitter and the acoustic wave receiver are installed at different heights of the vehicle as described above. , detect the ambient temperature at different heights, and obtain multiple sets of data to eliminate detection errors.

As shown in FIG. 2, in a further embodiment, the acoustic wave temperature measurement unit includes an acoustic wave transmitting circuit, including a frequency modulation oscillation module and an excitation amplification module;

In this embodiment, since the ambient temperature is detected by the sound wave, the frequency of the sound wave needs to be adjusted. The inductor L1 and the crystal oscillator X1 are designed to form a frequency-modulated oscillator, the triode Q1 to perform frequency multiplication amplification, the triode Q2 to form an excitation amplifier, and the triode Q3 to form a power amplifier.

In the experiment, the FM oscillator oscillates to generate a signal after frequency modulation. The frequency signal at this time needs to be amplified by frequency doubling, and then through excitation amplification and power amplification to obtain the expected acoustic wave emission signal.

As shown in FIG. 3 , in a further embodiment, the acoustic wave temperature measurement unit includes an acoustic wave receiving circuit, including a detection amplifier module and a power amplifier module;

In this embodiment, the main function of the triode Q4 is detection, the triode Q5 constitutes a voltage amplifier stage, and its main task is to amplify the signal, so that the power amplifier stage can obtain a larger signal voltage, the triode Q6 and The triode Q7 forms a class B power amplifying stage, and amplifies the power of the signal to obtain an accurate sound wave signal. In the experiment, after the signal is detected, it needs to be amplified for many times in order to obtain the detection data that meets the expectations.

In a further embodiment, the acoustic wave receiver receives the acoustic wave signal emitted by the acoustic wave transmitter and determines the travel time of the acoustic wave, since the distance between the acoustic wave receiver and the acoustic wave transmitter does not change, bringing the two distances into the measurable acoustic wave According to the propagation speed of the sound wave in the air is affected by the temperature, according to the empirical formula, the ambient temperature of the altitude is determined.

In a further embodiment, the ambient temperatures of different casings at the same height are compared, and according to the same ambient temperature at the same level, it can be seen that when the comparison result does not show a temperature difference, it proves that the vehicle does not sink in all directions, and when the comparison result shows a temperature difference , which proves that the vehicle has sunk. Since the ambient temperature is inversely proportional to the height, it can be known that the direction with a higher ambient temperature is the direction of sinking.

In a further embodiment, the daily balance observation results are stored locally and uploaded at the same time, and the next day, the locally saved data is cleared and the observation results are saved again to save the system memory capacity. After receiving the temperature difference data, send an alarm signal to the bound smart terminal.

Example 2

The actual high-rise vehicle measurement balance will have extreme environments, and there may be a heat source near the vehicle to affect the ambient temperature. For example, on the street, there are vehicle personnel as a heat source. Or the presence of large objects disturbing the airflow and affecting the sound wave transmission, such as highway driving disturbing the airflow.

In this embodiment, as shown in FIG. 1 , a vehicle remote balance detection system based on the Internet of Things technology includes a horizontal positioning unit, a temperature detection unit, a balance observation unit and a signal transmission unit;

The horizontal positioning unit determines that the infrared receiver of the temperature detection unit is in the same horizontal position;

The temperature detection unit, including a plurality of infrared receivers, is set around the outer wall of the vehicle at the same level to detect the ambient temperature;

The balance observation unit judges the current vehicle balance state by judging whether there is a temperature difference in the ambient temperature detected by the temperature detection unit;

The network transmission unit, connected to the network, updates the balance observations daily and sends them to the cloud for recording.

In a further embodiment, the sonic transmitter and the sonic receiver are connected first, and then mounted on the vehicle shell through a detachable connecting device on the back, and the sonic transmitter and the sonic receiver themselves are used to perform sonic distance measurement to confirm the height from the ground. , and then disassemble the two independent connecting devices on the back and keep one of them on the shell, install the connected acoustic wave transmitter and acoustic wave receiver on the horizontally opposite side of the vehicle shell through the other remaining connecting device, and perform the acoustic wave measurement again. Confirm the height from the ground, adjust the height to make it the same as the connection device left before, and separate the sonic transmitter and sonic receiver after confirming that the height is unified, and fix the sonic transmitter and sonic receiver with the connection devices on both sides respectively for use Detect the ambient temperature of the vehicle shell, because it is necessary to determine whether the vehicle is tilted by detecting the ambient temperature at the same height. Shortening the distance between the sonic transmitter and the sonic receiver can effectively reduce the impact caused by the extreme external environment.

In a further embodiment, the sound wave transmitter and the sound wave receiver are installed on each side of the casing of the vehicle in a combination to ensure that the ambient temperature in all directions of the vehicle is detected. The sound wave transmitter and sound wave receiver are installed at different heights of large vehicles as above, and the ambient temperature is detected at different heights, and multiple sets of data are obtained to eliminate detection errors. When a certain layer is affected by extreme environments and there is a detection error that deviates significantly from other sets of detection data, this set of data is discarded to avoid being misled.

In this embodiment, the main function of the triode Q4 is detection, the triode Q5 constitutes a voltage amplifier stage, and its main task is to amplify the signal, so that the power amplifier stage can obtain a larger signal voltage, the triode Q6 and The triode Q7 forms a class B power amplifying stage, which amplifies the power of the signal to obtain an accurate sound wave signal. In the experiment, after the signal is detected, it needs to be amplified for many times in order to obtain the detection data that meets the expectations.

In a further embodiment, the acoustic wave receiver receives the acoustic wave signal emitted by the acoustic wave transmitter and determines the travel time of the acoustic wave, since the distance between the acoustic wave receiver and the acoustic wave transmitter does not change, bringing the two distances into the measurable acoustic wave According to the propagation speed of sound waves in the air is affected by temperature, according to the empirical formula, the ambient temperature of this altitude is determined.

In a further embodiment, the ambient temperatures in different directions and at the same height are compared, and according to the same ambient temperature at the same level, it can be seen that when there is no temperature difference in the comparison result, it proves that the vehicle does not sink in all directions, and when there is a temperature difference in the comparison result , which proves that the vehicle has a problem of support deformation. Since the ambient temperature is inversely proportional to the height, it can be known that the direction with a higher ambient temperature is the sinking direction.

In conclusion, the present invention has the following advantages:

1. Determine the balance state of the vehicle by detecting the ambient temperature, observe the vehicle after it leaves the factory, and obtain the impact of the use of environmental factors on the vehicle balance during the delivery stage;

2. Adapt to different models and eliminate the influence of model size on the balance test results;

3. Simple structure, convenient for practical operation;

4. The balance state of the detected vehicle is not affected by the extreme environment of the surrounding heat source.

In addition, it should be noted that each specific technical feature described in the above-mentioned specific implementation manner can be combined in any suitable manner under the circumstance that there is no contradiction. In order to avoid unnecessary repetition, the present invention will not describe various possible combinations.

Claims

A vehicle remote balance detection system based on the Internet of Things technology, characterized in that it includes a sound wave positioning unit, a sound wave temperature measurement unit, a balance measurement unit and a network transmission unit;

The sound wave positioning unit determines that the sound wave transmitter and the sound wave receiver are in the same horizontal position;

The sound wave temperature measurement unit, including the sound wave transmitter and the sound wave receiver, is installed at the same level of the vehicle shell, and the installation distance is adjusted according to the size of the vehicle. By calculating the sound wave propagation speed in the air, the ambient temperature in the current direction and the level height is measured;

The balance measurement unit judges the current vehicle balance state by calculating whether there is a temperature difference in the ambient temperature at the same level in each direction of the vehicle shell;

The data transmission unit updates the balance observation data record every day and sends it to the cloud for storage.
A vehicle remote balance detection system based on the Internet of Things technology according to claim 1, characterized in that, in the acoustic wave positioning unit, the acoustic wave transmitter and the acoustic wave receiver can be connected, and each has a fixed structure on the back, and the acoustic wave is used for distance measurement. Determine the distance from the ground, keep the same level, and then install them separately according to the size of the vehicle.
The vehicle remote balance detection system based on the Internet of Things technology according to claim 1, wherein the acoustic wave temperature measurement unit includes an acoustic wave transmitting circuit, including a frequency modulation oscillation module and an excitation amplification module;

The frequency modulation oscillation module includes capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, inductor L1, diode D1, crystal oscillator X1 and transistor Q1;

One end of the capacitor C1 is connected to the input signal, the other end of the capacitor C1 is respectively connected to one end of the resistor R1, one end of the resistor R2 and one end of the resistor R3, and the other end of the resistor R2 is connected to the other end of the resistor R1. One end of the capacitor C2, one end of the resistor R5 and one end of the resistor R6 are all connected to the power supply voltage, and the other end of the resistor R3 is connected to the anode of the diode D1, one end of the capacitor C3, and the capacitor C5 One end of the resistor R7 and one end of the resistor R7 are both grounded, and the other end of the resistor R1 is respectively connected to one end of the inductor L1, one end of the resistor R4, the cathode of the diode D1 and the other end of the capacitor C3. , the other end of the inductor L1 is respectively connected to the other end of the resistor R4 and one end of the crystal oscillator X1, and the other end of the crystal oscillator X1 is respectively connected to the other end of the resistor R5 and the base of the transistor Q1 is connected to one end of the capacitor C4, the collector of the transistor Q1 is connected to the other end of the resistor R6, and the emitter of the transistor Q1 is respectively connected to the other end of the capacitor C4 and the other end of the capacitor C5 , the other end of the resistor R7 is connected to one end of the capacitor C6;

The excitation and amplification module includes resistor R8, resistor R9, resistor R10, capacitor C7, capacitor C8, capacitor C9, capacitor C10, capacitor C11, capacitor C12, capacitor C13, capacitor C14, capacitor C15, capacitor C16, capacitor C17, capacitor C18, Capacitor C19, Capacitor C20, Capacitor C21, Capacitor C22, Transistor Q2, Transistor Q3, Inductor L2, Inductor L3, Inductor L4, Inductor L5, Inductor L6, Inductor L7, Inductor L8, Inductor L9, Inductor L10 and Acoustic Transmitter Z1;

The other end of the capacitor C6 is respectively connected to one end of the resistor R8, one end of the resistor R9, one end of the capacitor C7 and the base of the transistor Q2, and the other end of the resistor R9 is respectively connected to the One end of the inductor L2, one end of the capacitor C10, one end of the capacitor C11 and one end of the inductor L3 are connected, the other end of the capacitor C10 and the other end of the capacitor C11 are both grounded, and the resistor R8 is connected to the ground. The other end and the other end of the capacitor C7, the emitter of the transistor Q2, one end of the capacitor C9, one end of the inductor L5, one end of the capacitor C16, one end of the capacitor C17, the capacitor One end of C18, one end of the capacitor C20 and one end of the acoustic wave transmitter Z1 are all grounded, and the collector of the transistor Q2 is connected to the other end of the inductor L2 and one end of the capacitor C8, respectively. The other end of C8 is respectively connected to the other end of the capacitor C9 and one end of the inductor L4, and the other end of the inductor L4 is respectively connected to the other end of the inductor L5, one end of the resistor R10 and the transistor Q3 The base of the resistor R10 is connected to the emitter of the transistor Q3, the collector of the transistor Q3 is connected to one end of the inductor L6, the other end of the capacitor C16 and the capacitor C15 One end of the inductor L6 is connected to the other end of the inductor L3, one end of the capacitor C12, one end of the capacitor C13 and one end of the capacitor C14 are all connected to the power supply voltage, and the capacitor C12 is connected to the power supply voltage. The other end of the capacitor C13 and the other end of the capacitor C14 are both grounded, one end of the capacitor C15 is connected to one end of the inductor L7, and the other end of the inductor L7 is respectively connected to the capacitor C17. The other end is connected to one end of the inductor L8, the other end of the inductor L8 is respectively connected to the other end of the capacitor C18 and one end of the capacitor C19, and the other end of the capacitor C19 is respectively connected to the other end of the inductor L10. One end of the capacitor C21 is connected to one end, the other end of the inductor L10 is connected to one end of the capacitor C20, and the other end of the capacitor C21 is connected to one end of the inductor L9 and one end of the capacitor C22 respectively. The other end of the inductor L9 is respectively connected to the other end of the capacitor C22 and the other end of the acoustic wave transmitter Z1.
The vehicle remote balance detection system based on the Internet of Things technology according to claim 1, wherein the acoustic wave temperature measurement unit includes an acoustic wave receiving circuit, including a detection amplifier module and a power amplifier module;

The detection and amplification module includes an acoustic wave receiver Z2, a triode Q4, a triode Q5, a capacitor C23, a capacitor C24, a capacitor C25, a capacitor C26, a resistor R11, a resistor R12, a resistor R13 and a potentiometer RV1;

One end of the acoustic wave receiver Z2 is connected to the base of the transistor Q4, and the other end of the acoustic wave receiver Z2 is connected to one end of the capacitor C24, the second pin of the potentiometer RV1, the capacitor C25 One end of the transistor Q5 and the emitter of the transistor Q5 are both grounded, the collector of the transistor Q4 is respectively connected to one end of the capacitor C23 and one end of the resistor R11, the other end of the capacitor C23 is grounded, and the transistor Q4 The emitters are respectively connected to the other end of the capacitor C24 and one end of the resistor R12, the other end of the resistor R12 is connected to the first pin of the potentiometer RV1, the third lead of the potentiometer RV1 The pins are respectively connected to the other end of the capacitor C25 and one end of the capacitor C26, the other end of the capacitor C26 is respectively connected to one end of the resistor R13 and the base of the transistor Q5, and the other end of the resistor R11 One end is connected to the other end of the resistor R13;

The power amplification module includes a transformer TR1, a transformer TR2, a capacitor C27, a capacitor C28, a capacitor C29, a transistor Q6, a transistor Q7, a resistor R14, a resistor R15 and a diode D2;

The first pin of the transformer TR1 is respectively connected to the other end of the resistor R11, the other end of the resistor R13, one end of the capacitor C27, one end of the resistor R14 and one end of the resistor R15, so The other end of the capacitor C27 is grounded, the second pin of the transformer TR1 is connected to the collector of the transistor Q5, the third pin of the transformer TR1 is connected to one end of the capacitor C28, and the The fourth pin is connected to the base of the transistor Q6, the fifth pin of the transformer TR1 is respectively connected to the other end of the resistor R14 and the anode of the diode D2, and the cathode of the diode D2 is connected to the The emitter of the transistor Q6, the emitter of the transistor Q7 and the fifth pin of the transformer TR2 are all grounded, the sixth pin of the transformer TR1 is connected to the base of the transistor Q7, and the The seventh pin is connected to one end of the capacitor C29, the collector of the transistor Q6 is respectively connected to the other end of the capacitor C28 and the first pin of the transformer TR2, and the collector of the transistor Q7 is respectively connected to The other end of the capacitor C29 is connected to the third pin of the transformer TR2, the second pin of the transformer TR2 and the other end of the resistor R15 are both connected to the power supply voltage, and the fourth pin of the transformer TR2 Connect the sound wave signal.
The vehicle remote balance detection system based on the Internet of Things technology according to claim 1, wherein the acoustic temperature measuring unit calculates the acoustic wave velocity through a fixed distance between the acoustic wave transmitter and the acoustic wave receiver, and calculates the acoustic wave speed according to different The ambient temperature is determined by the speed of sound wave transmission in the air at different temperatures.
A vehicle remote balance detection system based on the Internet of Things technology according to claim 1, wherein the balance measurement unit, according to the change of the ambient temperature with the horizontal height, compares the same level height environment measured by the vehicle shell in different directions temperature to determine the vehicle balance state.
The vehicle remote balance detection system based on the Internet of Things technology according to claim 1, wherein the data transmission unit includes a data recording module, which records the measured data in real time and covers the old data, and uploads the cloud records regularly every day. , cloud-integrated database.
A vehicle balance detection method based on sound wave temperature measurement, characterized in that the specific steps include:

Step 1. After connecting the sonic transmitter and the sonic receiver, install them on the vehicle shell to determine the height from the ground through sonic ranging, and then separately install the sonic transmitter and the sonic receiver on both ends of the shell;

Step 2, the sound wave receiver receives the sound wave signal emitted by the sound wave transmitter, and measures the sound wave speed from a fixed installation distance, and measures the ambient temperature of the height according to the different propagation speeds of the sound wave in the air of different temperatures;

Step 3. Compare the ambient temperature measured at the same horizontal height on the casing in different directions, according to the decrease of the ambient temperature with the increase of the height, and determine the balance state of the vehicle through the ambient temperature difference;

Step 4. Update the measurement data in real time, upload the data to the cloud record according to the set time every day, integrate the database in the cloud, and compare the database with the data change interval of the last 30 days. When there is an unbalanced data record, the cloud will send an alarm The signal is sent to the smart terminal bound by the owner.
The vehicle balance detection method based on sound wave temperature measurement according to claim 7, wherein sound wave transmitters and sound wave receivers of the same height are installed at different heights of the vehicle casing.