Tank car liquid level monitoring system

Abstract

The utility model provides a tank car liquid level monitoring system, and belongs to the technical field of liquid level monitoring. The tank car liquid level monitoring system comprises a liquid level monitoring module, a control module, a first temperature monitoring module and a second temperature monitoring module. The liquid level monitoring module is arranged above the liquid level in the tank car and comprises an ultrasonic transmitting unit and an ultrasonic receiving unit; the ultrasonic transmitting unit and the ultrasonic receiving unit are both connected with the control module; the first temperature monitoring module and the second temperature monitoring module are connected with the control module; the first temperature monitoring module is arranged in the tank car, and the second temperature monitoring module is arranged outside the tank car. The liquid level height in the tank car can be monitored in real time.

Description

Technical Field

[0001] The present disclosure relates to the technical field of liquid level monitoring, and particularly to a liquid level monitoring system for a tanker truck. Background Art

[0002] As an important tool for transporting liquid materials, tanker trucks are widely used in many industries such as petroleum, chemical, and food. However, during transportation, the accurate monitoring of the liquid level in the tanker truck has always been the focus of the industry. Traditional liquid level monitoring methods, such as manual dipstick measurement and simple mechanical liquid level gauges, have problems such as low measurement accuracy, poor real-time performance, and susceptibility to environmental interference, and are difficult to meet the efficiency requirements of the modern transportation industry. Utility Model Content

[0003] Embodiments of the present disclosure provide a liquid level monitoring system for a tanker truck to solve the problems of low measurement accuracy and poor real-time performance of the liquid level data of the tanker truck.

[0004] Embodiments of the present disclosure provide a liquid level monitoring system for a tanker truck, including:

[0005] A liquid level monitoring module, a control module, a first temperature monitoring module, and a second temperature monitoring module;

[0006] The liquid level monitoring module is arranged above the liquid surface inside the tanker truck, and the liquid level monitoring module includes an ultrasonic transmitting unit and an ultrasonic receiving unit;

[0007] Both the ultrasonic transmitting unit and the ultrasonic receiving unit are connected to the control module;

[0008] Both the first temperature monitoring module and the second temperature monitoring module are connected to the control module;

[0009] The first temperature monitoring module is arranged inside the tanker truck, and the second temperature monitoring module is arranged outside the tanker truck.

[0010] In an exemplary embodiment of the present disclosure, the ultrasonic transmitting unit includes an ultrasonic transmitting circuit and a temperature compensation circuit;

[0011] The ultrasonic transmitting circuit includes a switching transistor Q1, a switching transistor Q2, a comparator U1, an ultrasonic signal generator U2, a resistor R1, a resistor R2, and a capacitor C1;

[0012] The positive input terminal of the comparator U1 is used to be connected to the signal generator, the negative input terminal of the comparator U1 is respectively connected to the output terminal of the temperature compensation circuit, the first terminal of the capacitor C1, and the first terminal of the resistor R2, and the output terminal of the comparator U1 is connected to the first terminal of the resistor R1;

[0013] The second end of the resistor R1 is respectively connected to the control end of the switching transistor Q1 and the control end of the switching transistor Q2; the first end of the switching transistor Q1 is connected to VDD, and the second end is respectively connected to the first end of the switching transistor Q2 and the first end of the ultrasonic signal generator U2. The second end of the ultrasonic signal generator U2 is connected to the first end of the resistor R2. The second ends of the switching transistor Q2 and the resistor R2 are both connected to GND; the second end of the capacitor C1 is connected to GND.

[0014] In an exemplary embodiment of the present disclosure, the temperature compensation circuit includes:

[0015] A voltage regulator diode U3, a resistor R5, a resistor R6, a resistor R7, a resistor RT, and a capacitor C3;

[0016] The first end of the voltage regulator diode U3 is respectively connected to the second end of the resistor R7, the first end of the resistor R5, and the first end of the resistor R6. The second end of the voltage regulator diode U3 is respectively connected to the second end of the resistor R5, the second end of the resistor RT, the second end of the capacitor C3, and GND;

[0017] The first end of the resistor R7 is connected to VCC, and the first end of the resistor RT is respectively connected to the second end of the resistor R6, the first end of the capacitor C3, and the inverting input terminal of the comparator U1.

[0018] In an exemplary embodiment of the present disclosure, the ultrasonic receiving unit includes an amplifying circuit and a voltage stabilizing circuit;

[0019] The amplifying circuit includes an ultrasonic signal receiver U4, an amplifier U5, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C4, and a capacitor C5;

[0020] The first end of the ultrasonic signal receiver U4 and the first end of the resistor R8 are both connected to VCC. The second end of the ultrasonic signal receiver U4, the second end of the capacitor C4, and the first end of the resistor R11 are all connected to GND; the second end of the resistor R8 is respectively connected to the first end of the resistor R9 and the first end of the capacitor C4; the non-inverting input terminal of the amplifier U1 is connected to the second end of the resistor R9, and the inverting input terminal of the amplifier U1 is respectively connected to the second end of the resistor R11, the first end of the resistor R10, and the first end of the capacitor C5. The output terminal of the amplifier U1 is respectively connected to the second end of the resistor R10, the second end of the capacitor C5, and the voltage stabilizing circuit.

[0021] In an exemplary embodiment of the present disclosure, the voltage stabilizing circuit includes a capacitor C6 and a voltage regulator diode U6;

[0022] The first terminal of the capacitor C6 and the first terminal of the voltage regulator diode U6 are both connected to the control module, and the second terminal of the capacitor C6 and the second terminal of the voltage regulator diode U6 are both connected to GND.

[0023] In an exemplary embodiment of the present disclosure, the tanker liquid level monitoring system further includes:

[0024] A positioning module;

[0025] The positioning module is disposed outside the tanker and is connected to the control module.

[0026] In an exemplary embodiment of the present disclosure, the tanker liquid level monitoring system further includes:

[0027] A display screen;

[0028] The display screen is connected to the control module.

[0029] In an exemplary embodiment of the present disclosure, the tanker liquid level monitoring system further includes:

[0030] An early warning module and a communication module;

[0031] The early warning module is respectively connected to the control module and the communication module; the communication module is used to connect to a handheld terminal.

[0032] The beneficial effects of a tanker liquid level monitoring system provided by an embodiment of the present disclosure are as follows:

[0033] On the one hand, through the ultrasonic transmitting unit and the receiving unit in the liquid level monitoring module, the system can monitor the height of the liquid surface inside the tanker in real time and accurately, improve the monitoring accuracy, and provide an important guarantee for transportation safety. At the same time, the dual settings of the first temperature monitoring module and the second temperature monitoring module not only achieve precise monitoring of the temperature of the liquid inside the tank body, but also evaluate the heat insulation performance of the tank body by comparing the internal and external temperature differences, ensuring that the liquid maintains an appropriate temperature range during transportation, and effectively preventing changes in liquid quality or safety hazards caused by temperature fluctuations.

[0034] On the other hand, the present disclosure transmits the liquid level and temperature data to the control module in real time, and can timely detect and warn potential problems such as abnormal liquid level and temperature fluctuations through analysis and processing. This intelligent management method not only improves transportation efficiency, but also reduces the cost and difficulty of manual monitoring. Description of the Drawings

[0035] To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the accompanying drawings required for use in the embodiments or the description of the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0036] Figure 1 is a schematic structural diagram of a tank truck liquid level monitoring system provided by an embodiment of the present disclosure;

[0037] Figure 2 is a circuit diagram of an ultrasonic transmitting unit provided by an embodiment of the present disclosure;

[0038] Figure 3 is a circuit diagram of an ultrasonic receiving unit provided by an embodiment of the present disclosure. Specific embodiments

[0039] To enable those skilled in the art to better understand this solution, the following clearly describes the technical solutions in the embodiments of this solution in conjunction with the accompanying drawings in the embodiments of this solution. Obviously, the described embodiments are some, rather than all, of the embodiments of this solution. Based on the embodiments in this solution, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this solution.

[0040] The term "including" in the specification, claims, and above-mentioned accompanying drawings of this solution, as well as any other variations, means "including but not limited to", intending to cover non-exclusive inclusion and not limited to the examples listed in the text. In addition, terms such as "first" and "second" are used to distinguish different objects, rather than to describe a specific order.

[0041] The following describes the implementation of the present disclosure in detail in conjunction with specific accompanying drawings:

[0042] Figure 1 is a schematic structural diagram of a tank truck liquid level monitoring system provided by an embodiment of the present disclosure. Refer to Figure 1 and this tank truck liquid level monitoring system includes:

[0043] a liquid level monitoring module 11, a control module 12, a first temperature monitoring module 13, and a second temperature monitoring module 14;

[0044] The liquid level monitoring module 11 is arranged above the liquid surface inside the tank truck 10. The liquid level monitoring module 11 includes an ultrasonic transmitting unit 101 and an ultrasonic receiving unit 102;

[0045] Both the ultrasonic transmitting unit 101 and the ultrasonic receiving unit 102 are connected to the control module 12; the first temperature monitoring module 13 and the second temperature monitoring module 14 are both connected to the control module 12;

[0046] The first temperature monitoring module 13 is arranged inside the tanker 10, and the second temperature monitoring module 14 is arranged outside the tanker 10.

[0047] In this embodiment, the liquid level monitoring module 11 can measure the height of the liquid level inside the tanker 10. The liquid level monitoring module 11 includes an ultrasonic transmitting unit 101 and an ultrasonic receiving unit 102, and both units are located above the liquid surface inside the tanker 10. The ultrasonic transmitting unit 101 can emit ultrasonic pulses towards the liquid surface, and these pulses propagate in the air in the form of sound waves and will be reflected when encountering the liquid surface. The ultrasonic receiving unit 102 works in cooperation with the transmitting unit and can receive the ultrasonic signals reflected from the liquid surface.

[0048] After receiving the signal transmitted by the ultrasonic receiving unit 102, the control module 12 will record the time t from the emission to the reception of the ultrasonic wave and calculate the distance d from the liquid surface to the ultrasonic transmitting unit 101 using the formula d = vt / 2. Since the installation positions of the ultrasonic transmitting unit 101 and the ultrasonic receiving unit 102 are fixed, the actual liquid level height inside the tanker 10 can be further deduced.

[0049] The first temperature monitoring module 13 is arranged inside the tanker 10 to directly measure the temperature of the liquid in the tank. This is crucial for monitoring the state of the liquid (such as whether it is overheated, approaching the boiling point or freezing point). The second temperature monitoring module 14 is arranged outside the tanker 10 to measure the temperature of the environment around the tanker 10. The control module 12 can evaluate the influence of the external environment on the temperature inside the tank and determine whether additional heat preservation or cooling measures are needed based on the data collected by the first temperature monitoring module 13 and the second temperature monitoring module 14.

[0050] If the internal temperature suddenly rises or drops, it indicates that an abnormal situation has occurred inside the tank body (such as leakage, chemical reaction, etc.). At this time, the first temperature monitoring module 13 will promptly detect this change and trigger an alarm mechanism through the control module 12 to remind the transportation personnel to pay attention and observe.

[0051] As can be seen above, on the one hand, through the ultrasonic transmitting unit 101 and the receiving unit in the liquid level monitoring module 11, the system can monitor the height of the liquid level inside the tanker 10 in real time and accurately, providing an important guarantee for transportation safety. At the same time, the dual settings of the first temperature monitoring module 13 and the second temperature monitoring module 14 not only achieve precise monitoring of the temperature of the liquid inside the tank body, but also evaluate the heat insulation performance of the tank body by comparing the internal and external temperature differences, ensuring that the liquid maintains an appropriate temperature range during transportation and effectively preventing changes in liquid quality or safety hazards caused by temperature fluctuations.

[0052] On the other hand, this disclosure transmits the liquid level and temperature data to the control module 12 in real time, and through analysis and processing, it can timely detect and warn potential problems such as abnormal liquid level and temperature fluctuations. This intelligent management method not only improves transportation efficiency, but also reduces the cost and difficulty of manual monitoring.

[0053] In an embodiment of this disclosure, referring to Figure 2 , the ultrasonic transmitting unit 101 includes an ultrasonic transmitting circuit and a temperature compensation circuit;

[0054] The ultrasonic transmitting circuit includes a switching transistor Q1, a switching transistor Q2, a comparator U1, an ultrasonic signal generator U2, a resistor R1, a resistor R2, and a capacitor C1;

[0055] The positive input terminal of the comparator U1 is used to connect to the signal generator, and the negative input terminal of the comparator U1 is respectively connected to the output terminal of the temperature compensation circuit, the first terminal of the capacitor C1, and the first terminal of the resistor R2. The output terminal of the comparator U1 is connected to the first terminal of the resistor R1;

[0056] The second terminal of the resistor R1 is respectively connected to the control terminals of the switching transistor Q1 and the switching transistor Q2; the first terminal of the switching transistor Q1 is connected to VDD, the second terminal is respectively connected to the first terminal of the switching transistor Q2 and the first terminal of the ultrasonic signal generator U2, the second terminal of the ultrasonic signal generator U2 is connected to the first terminal of the resistor R2, and the second terminals of the switching transistor Q2 and the resistor R2 are both connected to GND; the second terminal of the capacitor C1 is connected to GND.

[0057] In this embodiment, the signal generator can be used to generate signals such as sawtooth waves and triangular waves. The switching transistor Q1 conducts when it is at a high level and cuts off when it is at a low level; the switching transistor Q2 cuts off when it is at a high level and conducts when it is at a low level. The comparator U1 can be used to compare the magnitudes of the signals from the signal generator and the signal input to the inverting input terminal. When the comparator U1 outputs a high-level signal, the switching transistor Q1 conducts, the switching transistor Q2 cuts off, and the current signal flows through Q1 to U2. At this time, U2 can send an ultrasonic signal to the liquid level; when the comparator U1 outputs a low-level signal, the switching transistor Q1 cuts off, the switching transistor Q2 conducts, and the voltage of VDD cannot be applied across U2, so U2 does not work.

[0058] The resistor R2 plays a role of constant current in the ultrasonic transmitting circuit. When the signal input to the inverting input terminal of the comparator U1 increases, the average current flowing through U2 within a certain period of time becomes smaller, the voltage across R2 becomes smaller, and the feedback current becomes smaller, thereby enabling the average current flowing through U2 to increase; when the signal input to the inverting input terminal of the comparator U1 decreases, the average current flowing through U2 within a certain period of time becomes larger, the voltage across R2 becomes larger, and the feedback current becomes larger, thereby enabling the average current flowing through U2 to decrease; therefore, R2 plays a role in keeping the current in the circuit constant.

[0059] It can be concluded from the above that the ultrasonic transmitting circuit in this embodiment realizes the stable transmission of ultrasonic signals. The constant-current function of the resistor R2 ensures the stability of the current in the circuit under different working conditions, improving the reliability and accuracy of the ultrasonic signals.

[0060] In an embodiment of the present disclosure, refer to Figure 2 , the temperature compensation circuit includes:

[0061] A voltage regulator diode U3, a resistor R5, a resistor R6, a resistor R7, a resistor RT, and a capacitor C3;

[0062] The first end of the voltage regulator diode U3 is respectively connected to the second end of the resistor R7, the first end of the resistor R5, and the first end of the resistor R6. The second end of the voltage regulator diode U3 is respectively connected to the second end of the resistor R5, the second end of the resistor RT, the second end of the capacitor C3, and GND;

[0063] The first end of the resistor R7 is connected to VCC. The first end of the resistor RT is respectively connected to the second end of the resistor R6, the first end of the capacitor C3, and the inverting input terminal of the comparator U1.

[0064] In this embodiment, the zener diode U3 can provide a stable reference voltage, which depends on the characteristics of U3 itself and the resistance value of the resistor R5. The resistor RT is a thermistor, and its resistance value changes with the change of temperature. One end of it is connected to the resistors R6 and C3, and the other end is grounded. The function of RT is to sense the change of the ambient temperature and convert it into a change in the resistance value, so as to adjust the voltage fed into the inverting input terminal of the comparator U1 to achieve temperature compensation. The capacitor C3 is connected in parallel with the resistor RT and the resistor R6, and mainly plays a filtering role. It can smooth the voltage fluctuation caused by the change of the resistance value of the resistor RT due to temperature change, making the voltage fed into the comparator U1 more stable.

[0065] In this embodiment, the resistance value of the thermistor is positively correlated with the temperature. When the temperature rises, the intensity of the ultrasonic signal emitted by the ultrasonic signal generator weakens, and then it is necessary to increase the current flowing through U2 to increase the intensity of the ultrasonic signal. Because the resistance value of the thermistor is positively correlated with the temperature, when the temperature rises, the resistance value of the thermistor decreases. Therefore, the voltage fed back by the temperature compensation circuit to the inverting input terminal of the comparator U1 decreases, and then the average current flowing through U2 can be increased.

[0066] It can be concluded from the above that the temperature compensation circuit combining the thermistor and the zener diode in this embodiment effectively addresses the influence of temperature change on the intensity of the ultrasonic signal. When the temperature rises and causes the ultrasonic signal to weaken, the circuit automatically adjusts to increase the current flowing through U2, thereby enhancing the intensity of the ultrasonic signal and ensuring the stability and reliability of ultrasonic wave emission.

[0067] In an embodiment of the present disclosure, refer to Figure 3 , the ultrasonic receiving unit 102 includes an amplifying circuit and a voltage stabilizing circuit;

[0068] The amplifying circuit includes an ultrasonic signal receiver U4, an amplifier U5, resistors R8, R9, R10, R11, capacitors C4 and C5;

[0069] The first end of the ultrasonic signal receiver U4 and the first end of the resistor R8 are both connected to VCC. The second end of the ultrasonic signal receiver U4, the second end of the capacitor C4, and the first end of the resistor R11 are all connected to GND. The second end of the resistor R8 is respectively connected to the first end of the resistor R9 and the first end of the capacitor C4. The non-inverting input terminal of the amplifier U1 is connected to the second end of the resistor R9. The inverting input terminal of the amplifier U1 is respectively connected to the second end of the resistor R11, the first end of the resistor R10, and the first end of the capacitor C5. The output terminal of the amplifier U1 is respectively connected to the second end of the resistor R10, the second end of the capacitor C5, and the voltage stabilizing circuit.

[0070] In this embodiment, the ultrasonic signal receiver U4 can receive the ultrasonic pulse signal emitted by the ultrasonic signal generator U2 and convert it into an electrical signal. The converted electrical signal is output through the second terminal of U4 and filtered by the capacitor C4. C4 can remove high-frequency noise and clutter in the signal, making the signal cleaner. The resistors R8 and R9 form a voltage-dividing circuit to perform voltage division on the filtered signal to meet the input requirements of the amplifier U5.

[0071] Since the converted electrical signal may be too small to drive the control module 12 to work, this embodiment adds an amplifier circuit to amplify the converted electrical signal.

[0072] In an embodiment of the present disclosure, the voltage stabilization circuit includes a capacitor C6 and a voltage stabilizing diode U6;

[0073] The first terminal of the capacitor C6 and the first terminal of the voltage stabilizing diode U6 are both connected to the control module 12, and the second terminal of the capacitor C6 and the second terminal of the voltage stabilizing diode U6 are both connected to GND.

[0074] In this embodiment, the voltage stabilization circuit includes a capacitor C6 and a voltage stabilizing diode U6. When the current passing through U6 changes within a certain range, the voltage across its two ends (i.e., the voltage between the first terminal and the second terminal of U6) will remain at a relatively stable value, which is determined by the characteristics of the voltage stabilizing diode itself. The capacitor C6 plays a filtering role in this voltage stabilization circuit.

[0075] When the control module 12 or other subsequent circuits require a stable operating voltage, the voltage stabilization circuit adjusts the unstable input voltage to a preset stable value through the voltage stabilizing diode U6. If the input voltage increases, the voltage stabilizing diode U6 will increase its internal resistance, thereby limiting the current passing through it and maintaining the stability of the output voltage; on the contrary, if the input voltage decreases, the voltage stabilizing diode U6 will reduce its internal resistance to keep the output voltage unchanged. In this way, the control module 12 can be protected from damage when the input voltage is too low or too high.

[0076] In an embodiment of the present disclosure, referring to Figure 1 , the tank truck liquid level monitoring system further includes:

[0077] A positioning module 15;

[0078] The positioning module 15 is arranged outside the tank truck 10 and is connected to the control module 12.

[0079] In this embodiment, the positioning module 15 can obtain the geographical location information of the tanker 10 in real time, including longitude, latitude, speed, direction, etc. The positioning module 15 can be a GPS system, which includes a GPS positioning terminal and a GSM network communication. The satellite positioning information is sent to a third party (such as a monitoring terminal or an alarm center, etc.) via SMS through the GSM network. The third party interprets the SMS text through a microcomputer and displays the vehicle position on an electronic map, thus realizing vehicle-mounted GPS positioning.

[0080] The positioning module 15 can also record the historical driving track and position data of the tanker 10. These data are of great significance for aspects such as logistics analysis, route optimization, and cost savings. By analyzing the data, more efficient transportation routes and strategies can be found to improve transportation efficiency.

[0081] In an embodiment of the present disclosure, referring to Figure 1 , the tanker liquid level monitoring system further includes:

[0082] A display screen 16;

[0083] The display screen 16 is connected to the control module 12.

[0084] In this embodiment, the display screen 16 is arranged outside the tanker 10 or in the driver's cab. The display screen 16 can receive the data sent by the control module 12. After receiving these data, the display screen 16 can display the liquid level information of the tanker 10 in real time, including key data such as liquid level height and volume percentage. In addition to the liquid level information, the display screen 16 can also display other status information of the tanker 10, such as temperature, pressure, vehicle speed, etc. These information are crucial for ensuring the safety and stability of the tanker 10 during transportation. When the liquid level exceeds the preset safety range, the system fails or abnormal situations occur, the display screen 16 can issue an alarm prompt in the form of text, icons or sounds to remind the operator to take measures in time.

[0085] When the operator interacts with the display screen 16 through a touch screen or buttons, the display screen 16 will capture these input signals and transmit them to the control module 12. The control module 12 processes according to the input signals and updates the display content on the display screen 16.

[0086] It can be concluded from the above that the display screen 16 plays an important role in the tanker liquid level monitoring system. It not only provides an intuitive data display and status indication function, but also enhances the interactivity between the user and the system, improving the overall performance and user experience of the system.

[0087] In an embodiment of the present disclosure, referring to Figure 1 , the tanker liquid level monitoring system further includes:

[0088] An early warning module 17 and a communication module 18;

[0089] The early warning module 17 is respectively connected to the control module 12 and the communication module 18; the communication module 18 is used to connect to a handheld terminal.

[0090] In this embodiment, the early warning module 17 is connected to the control module 12 through an interface and receives the data sent by the control module 12 in real time. When the control module 12 determines that the received data exceeds a preset threshold, it will send an instruction to the early warning module 17, and the early warning module 17 triggers a corresponding early warning mechanism according to the instruction. At the same time, the early warning module 17 can also be connected to the communication module 18 to send the early warning information to a remote monitoring center or a handheld terminal.

[0091] The early warning module 17 can support multiple early warning methods, such as sound alarm, light flashing, and the display screen 16 displaying warning information, etc., to ensure that the operator can quickly notice and take corresponding measures.

[0092] The communication module 18 establishes a connection with a handheld terminal or a remote monitoring center through a wireless communication method (such as GSM, GPRS, 4G / 5G, Wi-Fi, etc.). When the early warning module 17 triggers an early warning, the communication module 18 encodes the early warning information into a data packet and sends it through a wireless channel to the receiving end. At the same time, the communication module 18 can also receive an instruction data packet from the receiving end, decode it, and transmit it to the control module 12 for processing.

[0093] From the above, it can be concluded that in this embodiment, the early warning module 17 can monitor the status of the tanker 10 in real time and trigger an early warning mechanism to ensure that the operator can timely discover and handle potential dangerous situations; while the communication module 18 realizes the remote transmission of data and the remote reception of instructions, enabling the operator to monitor and manage at any time and any place. The collaborative work of the two modules improves the safety and efficiency of the transportation process of the tanker 10.

[0094] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present disclosure.

Claims

1. A tank truck liquid level monitoring system, characterized in that: include: A liquid level monitoring module, a control module, a first temperature monitoring module and a second temperature monitoring module; The liquid level monitoring module is arranged above the liquid level inside the tank truck, and the liquid level monitoring module includes an ultrasonic transmitting unit and an ultrasonic receiving unit; The ultrasonic transmitting unit and the ultrasonic receiving unit are both connected to the control module; The first temperature monitoring module and the second temperature monitoring module are both connected to the control module; The first temperature monitoring module is arranged inside the tank truck, and the second temperature monitoring module is arranged outside the tank truck.

2. The tank truck liquid level monitoring system according to claim 1, characterized in that: The ultrasonic transmitting unit includes an ultrasonic transmitting circuit and a temperature compensation circuit; The ultrasonic transmitting circuit includes a switch tube Q1, a switch tube Q2, a comparator U1, an ultrasonic signal generator U2, a resistor R1, a resistor R2, and a capacitor C1; The non-inverting input terminal of the comparator U1 is used to connect to the signal generator, the inverting input terminal of the comparator U1 is respectively connected to the output terminal of the temperature compensation circuit, the first terminal of the capacitor C1, and the first terminal of the resistor R2, and the output terminal of the comparator U1 is connected to the first terminal of the resistor R1; The second end of the resistor R1 is respectively connected to the control end of the switch tube Q1 and the control end of the switch tube Q2; the first end of the switch tube Q1 is connected to VDD, and the second end is respectively connected to the first end of the switch tube Q2 and the first end of the ultrasonic signal generator U2, the second end of the ultrasonic signal generator U2 is connected to the first end of the resistor R2, and the second end of the switch tube Q2 and the second end of the resistor R2 are both connected to GND; the second end of the capacitor C1 is connected to GND.

3. The tank truck liquid level monitoring system according to claim 2, characterized in that: The temperature compensation circuit comprises: Voltage regulator U3, resistor R5, resistor R6, resistor R7, resistor RT, capacitor C3; The first end of the voltage regulator tube U3 is respectively connected to the second end of the resistor R7, the first end of the resistor R5, and the first end of the resistor R6, and the second end of the voltage regulator tube U3 is respectively connected to the second end of the resistor R5, the second end of the resistor RT, the second end of the capacitor C3 and GND; The first end of the resistor R7 is connected to VCC, and the first end of the resistor RT is respectively connected to the second end of the resistor R6, the first end of the capacitor C3, and the inverting input end of the comparator U1.

4. The tank truck liquid level monitoring system according to claim 1, characterized in that: The ultrasonic receiving unit includes an amplifying circuit and a voltage stabilizing circuit; The amplifying circuit includes an ultrasonic signal receiver U4, an amplifier U5, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C4 and a capacitor C5; The first end of the ultrasonic signal receiver U4 and the first end of the resistor R8 are both connected to VCC, and the second end of the ultrasonic signal receiver U4, the second end of the capacitor C4, and the first end of the resistor R11 are all connected to GND; the second end of the resistor R8 is respectively connected to the first end of the resistor R9 and the first end of the capacitor C4; the non-inverting input end of the amplifier U1 is connected to the second end of the resistor R9, the inverting input end of the amplifier U1 is respectively connected to the second end of the resistor R11, the first end of the resistor R10, and the first end of the capacitor C5, and the output end of the amplifier U1 is respectively connected to the second end of the resistor R10, the second end of the capacitor C5, and the voltage stabilizing circuit.

5. The tank truck liquid level monitoring system according to claim 4, characterized in that: The voltage stabilizing circuit includes a capacitor C6 and a voltage stabilizing tube U6; The first end of the capacitor C6 and the first end of the voltage regulator U6 are both connected to the control module, and the second end of the capacitor C6 and the second end of the voltage regulator U6 are both connected to GND.

6. The tank truck liquid level monitoring system according to claim 1, characterized in that: Also includes: Positioning module; The positioning module is arranged outside the tank truck and connected to the control module.

7. The tank truck liquid level monitoring system according to claim 1, characterized in that: Also includes: Display screen; The display screen is connected to the control module.

8. The tank truck liquid level monitoring system according to claim 1, characterized in that: Also includes: Early warning module and communication module; The early warning module is connected to the control module and the communication module respectively; the communication module is used to connect to the handheld terminal.

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