Hydrogen supply monitoring circuit structure of vehicle-mounted hydrogen storage bottle

Abstract

The utility model discloses a hydrogen supply monitoring circuit structure of a vehicle-mounted hydrogen storage bottle, which comprises a main control module, a temperature acquisition module, a pressure acquisition module, a concentration acquisition module and a power supply output detection module, working voltage or working current of devices such as a current electromagnetic valve, a pressure sensor or a temperature sensor is obtained through the power output detection module, the data are transmitted to the main control module, the main control module analyzes whether the devices are short-circuited or open-circuit faults or not, in this way, reasons of abnormal conditions can be detected more accurately, misoperation is avoided, and the working efficiency is improved. And the safety is improved. In addition, the state of the hydrogen storage bottle is monitored in real time through the temperature acquisition module, the pressure acquisition module and the concentration acquisition module, and treatment measures can be taken in time when abnormal conditions occur.

Description

Technical Field

[0001] This utility model relates to a monitoring circuit, and more particularly to a hydrogen supply monitoring circuit structure for an on-board hydrogen storage cylinder. Background Technology

[0002] A hydrogen storage cylinder is a high-pressure container used to store hydrogen. During the hydrogen supply process, abnormalities can easily occur in the temperature, pressure, concentration, and valve wiring harness inside the cylinder. If these abnormalities are not detected in time, they can lead to significant safety hazards.

[0003] In existing technologies, hydrogen supply systems are equipped with temperature sensors, pressure sensors, hydrogen concentration sensors, and controllers to detect and control the status of the hydrogen supply system to ensure its safety. However, such on-board hydrogen supply control systems have relatively simple functions and cannot perform in-depth analysis and processing of abnormal results. Their processing strategies are not precise enough, which can easily lead to misoperation and lower safety. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a hydrogen supply monitoring circuit structure for vehicle-mounted hydrogen storage cylinders.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A hydrogen supply monitoring circuit structure for an on-board hydrogen storage cylinder includes a main control module, a temperature acquisition module, a pressure acquisition module, a concentration acquisition module, and a power output detection module. The input terminal of the main control module is connected to the output terminals of the temperature acquisition module, the pressure acquisition module, the concentration acquisition module, and the power output detection module, respectively. The output terminal of the main control module is connected to a solenoid valve through a control circuit. The communication terminal of the main control module is connected to a wireless communication module.

[0007] The main control module includes a main control chip U1, which is connected to a filter circuit, a debugging circuit, and an oscillation circuit.

[0008] The main control chip U1 has a working indicator LED2 connected in series on its 8th pin and a stop indicator LED3 connected in series on its 9th pin.

[0009] The power output detection module includes a current detection circuit and a voltage detection circuit. The current detection circuit includes a current sensor U4, the input of which is connected to the power supply terminal of the solenoid valve, and the output of which is connected to the input of the main control chip U1. The voltage detection circuit includes a field-effect transistor Q3, the input of which is connected to the power supply terminal of the pressure sensor, and the output of which is connected to the input of the main control chip U1.

[0010] The temperature acquisition module includes a multiplexer U25, the input of which is connected to the temperature sensor, and the output of which is connected to the input of the main control chip U1.

[0011] The pressure acquisition module includes operational amplifier U411 and operational amplifier U412. The input terminal of operational amplifier U411 is connected to a low-pressure sensor, and the output terminal is connected to the input terminal of the main control chip U1. The input terminal of operational amplifier U412 is connected to a high-pressure sensor, and the output terminal is connected to the input terminal of the main control chip U1.

[0012] The concentration acquisition module includes a PWM signal circuit and an analog signal circuit. The PWM signal circuit includes a transistor Q17, the base of which is connected to the PWM concentration sensor, the collector of which is connected to the input terminal of the main control chip U1, and the emitter of which is grounded. A capacitor C64 and a resistor 136 are connected between the base and the emitter. The analog signal circuit includes transport amplifiers U381 and U382, the input terminals of which are connected to the analog concentration sensor, and the output terminals of which are connected to the input terminal of the main control chip U1.

[0013] The control circuit includes a field-effect transistor Q30, a transistor Q31, a digital transistor Q6, and a current-sensing amplifier U421. The output terminal of the main control chip U1 is connected to pin 1 of the digital transistor Q6, pin 2 of the digital transistor Q6 is grounded, pin 3 of the digital transistor Q6 is connected to the base of the transistor Q31, the collector of the transistor Q31 is connected to pin 4 of the field-effect transistor Q30, pins 5-8 of the field-effect transistor Q30 are connected to a solenoid valve, pins 1-3 of the field-effect transistor Q30 are connected to the input terminal of the current-sensing amplifier U421, and the output terminal of the current-sensing amplifier U421 is connected to the input terminal of the main control chip U1.

[0014] The wireless communication module includes a networking circuit, which includes a mobile 4G module U32. Pin 3 of the mobile 4G module U32 is connected to pin 56 of the main control chip U1. Pin 4 of the mobile 4G module U32 is connected to pin 55 of the main control chip U1. Pin 5 of the mobile 4G module U32 is connected to pin 3 of the digital transistor Q27. Pin 2 of the digital transistor Q27 is grounded. Pin 1 of the digital transistor Q27 is connected to pin 67 of the main control chip U1. Pin 6 of the mobile 4G module U32 is connected to pin 64 of the main control chip U1. Pin 7 of the mobile 4G module U32 is connected to pin 63 of the main control chip U1.

[0015] The beneficial effects of this utility model are as follows: This utility model has a power output detection module connected to the input end of the main control module. The power output detection module obtains the current operating voltage or operating current of devices such as solenoid valves, pressure sensors or temperature sensors, and transmits these data to the main control module. The main control module analyzes whether the devices have short circuit or open circuit faults. This can more accurately detect the cause of abnormal conditions, thereby avoiding misoperation and improving safety.

[0016] In addition, this utility model also includes a temperature acquisition module, a pressure acquisition module, and a concentration acquisition module to monitor the status of the hydrogen storage cylinder in real time and take timely measures to deal with abnormal situations. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a block diagram illustrating the principle of this utility model.

[0019] Figure 2 This is the circuit schematic of the main control module.

[0020] Figure 3 This is the circuit diagram of the power supply module.

[0021] Figure 4 This is the circuit diagram of a current detection circuit.

[0022] Figure 5 This is the circuit diagram of a voltage detection circuit.

[0023] Figure 6 This is the circuit diagram of the temperature acquisition module.

[0024] Figure 7 This is the circuit diagram of the pressure acquisition module.

[0025] Figure 8 This is the circuit diagram of the concentration acquisition module.

[0026] Figure 9 This is the circuit diagram of the control circuit.

[0027] Figure 10 This is the circuit schematic of the data transfer module.

[0028] Figure 11 This is the circuit schematic of a wireless communication module. Detailed Implementation

[0029] Reference Figure 1A hydrogen supply monitoring circuit structure for an on-board hydrogen storage cylinder includes a main control module, a temperature acquisition module, a pressure acquisition module, a concentration acquisition module, and a power output detection module. The input terminal of the main control module is connected to the output terminals of the temperature acquisition module, pressure acquisition module, concentration acquisition module, and power output detection module, respectively. The output terminal of the main control module is connected to a solenoid valve through a control circuit. The communication terminal of the main control module is connected to a wireless communication module. This invention incorporates a power output detection module at the input terminal of the main control module. This module detects the operating voltage and current of the cylinder valve, solenoid valve, and sensors, thereby more accurately detecting any abnormal conditions and improving safety. Furthermore, it features temperature acquisition, pressure acquisition, concentration acquisition, and solenoid valve detection and control functions, enabling status monitoring and hydrogen supply control of the hydrogen supply system, and allowing for timely handling of any abnormal situations.

[0030] Figures 2 to 11 Together, this is the complete circuit schematic of this embodiment. For easier observation, the complete circuit diagram is divided into 10 parts, and terminals with the same number in the diagram indicate electrical connections.

[0031] Specifically, refer to Figure 2The main control module includes a main control chip U1, which uses a common microcontroller. In this embodiment, the microcontroller used in the main control chip U1 is HC32A4A0PITI-LQFP100. The main control chip U1 is connected to a filtering circuit, a debugging circuit, and an oscillation circuit. The filtering circuit includes capacitors C1-C13, capacitors C1-C7 connected in parallel between voltage 3V3 and ground DGND, capacitors C8-C10 connected in parallel between voltage A3V3 and ground AGND, and capacitors C11-C13 connected in parallel between voltage VERF3V and ground AGND. The filtering circuit is used to filter out interference signals. The debugging circuit includes connector H1. Pin 1 of connector H1 is connected to a voltage of A5V. Pin 2 of connector H1 is connected to pin 72 of the main control chip U1 through resistor R1. Pin 3 of connector H1 is connected to pin 76 of the main control chip U1 through resistor R2. Pin 4 of connector H1 is grounded. This debugging circuit is used for program input or debugging. Pin 14 of the main control chip U1 is connected in series with resistor R195 and capacitor C103 to make the input signal cleaner, reduce signal interference, and facilitate user operation. The oscillation circuit includes crystal oscillator X1. One path of crystal oscillator X1 is connected to pin 12 of the main control chip U1, and the other path is connected to pin 13 of the main control chip U1. Capacitor C15 is connected between ground (DGND) of pin 12, and capacitor C16 is connected between ground (DGND) of pin 13. This oscillation circuit can reduce the impact of surge current on the circuit. A working indicator LED2 is connected in series to pin 8 of the main control chip U1, and a stop indicator LED3 is connected in series to pin 9 of the main control chip U1. The working indicator LED2 and the stop indicator LED3 are used to indicate whether the solenoid valve is started or stopped.

[0032] Reference Figure 3 , Figure 3 This embodiment presents a typical power supply module circuit diagram, including a voltage buck chip U7, a voltage buck chip U5, a voltage buck chip U6, and a linear regulator U13. The input terminal of the voltage buck chip U7 is connected to a 24V DC voltage. The symbol MAIN_24VIN in the diagram represents the positive terminal of the 24V DC voltage. The voltage buck chip U7 steps down the 24V DC voltage to 12V DC voltage. The DC voltage D12V+ is input to the voltage buck chip U6, which steps down the 12V DC voltage to DC voltage A5V+, which is used to power the monitoring system. The DC voltage A12V+ is input to the voltage buck chip U5, which steps down the 12V DC voltage to DC voltage O5V+, which is used as an output to power external devices for convenient power access. The linear regulator U13 steps down the DC voltage A5V+ to the chip's operating voltage of 3V3.

[0033] Reference Figure 4 , Figure 4 This is a circuit diagram of the current detection circuit given in this embodiment. The current detection circuit includes a current sensor U4. The first, second, third, and fourth pins of the current sensor U4 are connected to the power supply terminal of the solenoid valve to detect the power supply of the solenoid valve. The seventh pin of the current sensor U4 is connected to the 33rd pin of the main control chip U1 through a resistor R6. A resistor R7, a capacitor C19, and a TVS diode D3 are also connected in parallel between the resistor R6 and the 33rd pin to improve the stability of the signal output.

[0034] In this embodiment, the detection current can be used to detect whether the solenoid valve wiring harness is short-circuited. A short circuit in the solenoid valve will trigger overcurrent protection. The overcurrent protection current can be set to 4A. If this current is exceeded, the main control chip U1 will issue a solenoid valve short-circuit fault signal. It can also detect whether the solenoid valve wiring harness is open-circuited. Specifically, when there is an open circuit, the circuit current is 0A, and at this time, the main control chip U1 will issue a solenoid valve open-circuit fault signal.

[0035] Reference Figure 5 , Figure 5 This is a circuit diagram of the voltage detection circuit provided in this embodiment. The voltage detection circuit includes the detection of 24V, 12V, and 5V voltages. The 12V and 5V voltage detections utilize a field-effect transistor (FET) Q3. The FET Q3 used is model 4953. In the diagram, D represents the drain of FET Q3, S represents the source of FET Q3, and G represents the gate of FET Q3. The drain of FET Q3 serves as the voltage detection input terminal, and the gate serves as the voltage detection output terminal. Specifically, pins 5 and 6 of FET Q3 are used to connect to a device with a 12V supply voltage, and pin 7... Pin 8 is used to connect to devices with a 5V power supply, including fuses F1-F4, TVS diodes D10 and D13, Schottky diodes D9 and D12, and sensors labeled OUT_DC12V1 and OUT_DC12V2 connected to 12V powered sensors, and sensors labeled OUT_DC5V1 and OUT_DC5V2 connected to 5V powered sensors. Pin 2 of the MOSFET Q3 is connected to pin 40 of the main control chip U1 via digital transistor Q5, and pin 4 of the MOSFET Q3 is connected to pin 39 of the main control chip U1 via digital transistor Q5. In this embodiment, the 24V voltage detection includes the MOSFET Q1, with the drain of the MOSFET Q1 connected to the device requiring 24V power supply detection. A resistor R22 and a digital transistor Q2 are connected in series between the gate of the MOSFET Q1 and pin 38 of the main control chip U1.

[0036] In this embodiment, voltage detection can detect whether a sensor is short-circuited. For example, the fault voltage range for a low-voltage sensor is: operating voltage ≤ 0.25V or operating voltage ≥ 4.75V. If the main control chip U1 detects that the operating voltage exceeds this range, it outputs a low-voltage sensor fault signal. Similarly, for temperature sensors, a short circuit will not trigger overcurrent protection, but the main control chip U1 will detect a 0Ω acquisition resistance and output a temperature sensor short-circuit fault. If the acquired resistance is infinite, it outputs a temperature sensor open-circuit fault. For different fault signals, the main control chip U1 can issue corresponding fault codes for user reference. Additionally, voltage detection can also detect whether the system circuit's power supply is abnormal. This can be achieved by connecting a power supply line from the point where the chip is powered to the voltage detection circuit, enabling a self-test.

[0037] Reference Figure 6 , Figure 6 This is a circuit diagram of the temperature acquisition module provided in this embodiment. The temperature acquisition module includes a multiplexer U25. In this embodiment, three temperature acquisition circuits are provided. In actual use, corresponding circuits can be added as needed. Specifically, pins 13-15 of the multiplexer U25 are used to acquire temperature acquisition signals. BOTTLETEMP1+ and BOTTLETEMP1- in the diagram represent the temperature signals input from the temperature sensor. The positive terminal is connected to pin 13 through inductor L10 and resistor R92. A capacitor C53, a TVS diode D49, and a resistor R96 are connected in parallel between the positive and negative terminals. Pin 3 of the multiplexer U25 is connected to pin 30 of the main control chip U1 through resistor R25. Pins 9-11 of the multiplexer U25 are connected sequentially to pins 51-53 of the main control chip U1.

[0038] Reference Figure 7 , Figure 7This is a circuit diagram of the pressure acquisition module provided in this embodiment. The pressure acquisition module includes operational amplifier U411 and operational amplifier U412. Operational amplifiers U411 and U412 together form a complete operational amplifier, model GS8552-SR. Pin 3 of operational amplifier U411 is connected to a low-pressure sensor via resistor R157 and inductor L25. Capacitor C72 and resistor R163 are connected to the input terminal of pin 3 to stabilize the input signal. Pin 4 of operational amplifier U411 is grounded (DGND). Pin 2 of operational amplifier U411 is connected to pin 1. Pin 1 is connected to pin 25 of the main control chip U1 via resistor R158. Resistor R161 and TVS diode D70 are connected to the output terminal of pin 1 to stabilize the output signal. The operational amplifier U412 is connected in the same way as the operational amplifier U411, except that the input terminal of the operational amplifier U411 is connected to a low-pressure sensor, while the input terminal of the operational amplifier U412 is connected to a high-pressure sensor. The output terminal of the operational amplifier U412 is connected to pin 26 of the main control chip U1, and the two channels are used to detect the high-pressure value and low-pressure value of the hydrogen storage tank respectively.

[0039] Reference Figure 8 , Figure 8This is a circuit diagram of the concentration acquisition module provided in this embodiment. The concentration acquisition module includes a PWM signal circuit and an analog signal circuit. The concentration acquisition module is used to detect whether hydrogen is leaking. The PWM signal circuit includes a transistor Q17. The base of the transistor Q17 is connected to the PWM concentration sensor through a resistor R132 and a switching diode. The PWM concentration sensor detects the concentration value of the hydrogen storage tank and transmits a PWM signal. A TVS diode D60 is connected to the output terminal of the PWM concentration sensor to make the output signal more stable. The collector of the transistor Q17 is connected to the input terminal of the main control chip U1, and the emitter of the transistor Q17 is grounded to DGND. A capacitor C64 and a resistor 136 are connected between the base and the emitter. The analog signal circuit includes transport amplifiers U381 and U382. The operational amplifiers U381 and U382 together form a complete operational amplifier, model GS8552-SR. The transport amplifiers U381 and U382 are dual-channel detection circuits used to detect the concentration values ​​of different hydrogen storage cylinders. The input terminals of transport amplifiers U381 and U382 are connected to analog concentration sensors, which output analog signals. Specifically, pin 3 of operational amplifier U381 is connected to the analog concentration sensor via resistor R137 and inductor L21. A capacitor C65 and resistor R140 are connected to the input terminal of pin 3 to stabilize the input signal. Pin 4 of operational amplifier U381 is grounded (DGND), and pin 2 is connected to pin 1. Pin 1 is connected to pin 15 of the main control chip U1 via resistor R133. A resistor R138 and TVS diode D61 are connected to the output terminal of pin 1 to stabilize the output signal. The connection method of operational amplifier U382 is the same as that of operational amplifier U381, and the output terminal of operational amplifier U382 is connected to pin 16 of the main control chip U1.

[0040] Reference Figure 9 , Figure 9This is a circuit diagram of the control circuit provided in this embodiment. The control circuit includes a single-channel valve control circuit and a main-channel valve control circuit. The single-channel valve control circuit includes a field-effect transistor Q30, a transistor Q31, a digital transistor Q6, and a current sensing amplifier U421. The first pin of the main control chip U1 is connected to the first pin of the digital transistor Q6. The second pin of the digital transistor Q6 is grounded. The third pin of the digital transistor Q6 is connected to the base of the transistor Q31 through a resistor R49. Resistors R43 and R46 are connected between the base and emitter of the transistor Q31. The collector of the transistor Q31 is connected to the fourth pin of the field-effect transistor Q30. The fifth to eighth pins of the field-effect transistor Q30 are connected to the solenoid valve. The above circuit is used to control the start and stop of the solenoid valve. Pins 1-3 of the field-effect transistor Q30 are connected to pin 3 of the input terminal of the current sensing amplifier U421. Pin 1 of the output terminal of the current sensing amplifier U421 is connected to pin 12 of the input terminal of the multiplexer U25, and then connected to the main control chip U1 through the output terminal of the multiplexer U25. This circuit is used to detect whether the solenoid valve is malfunctioning. Since the system has several solenoid valves, a detection and control circuit is required for each solenoid valve. A current sensing amplifier of model INA4180A2QPWRQ1 can be used. One current sensing amplifier can detect up to four channels, which is convenient for detecting four solenoid valves. The connection method of the main valve control circuit is roughly the same as that of the single-channel valve control circuit. The difference is that the current sensing amplifier U8 is model INA180A2QDBVRQ1, which can detect a single channel.

[0041] Reference Figure 10 , Figure 10 This is a circuit diagram of the data transmission module provided in this embodiment. The data transmission module includes an RS485 circuit and a CAN circuit. The RS485 circuit and CAN circuit are used to connect to external RS485 and CAN interfaces, which can be used by a host computer for data transmission backup. The RS485 circuit includes an RS485 transceiver U28. Pins 1-4 of the RS485 transceiver U28 are connected to the main control chip U1, and pins 6 and 7 of the RS485 transceiver U28 are connected to an external communication interface. The CAN circuit includes a CAN transceiver U30. Pins 2 and 3 of the CAN transceiver U30 are connected to the main control chip U1, and pins 6 and 7 of the CAN transceiver U30 are connected to an external communication interface through a common-mode filter.

[0042] Reference Figure 11 , Figure 11This is a circuit diagram of the wireless communication module provided in this embodiment. The wireless communication module includes a networking circuit and a positioning circuit. The networking circuit can communicate with the backend and receive fault codes issued by the main control chip U1, allowing users to remotely check them. The networking circuit includes a mobile 4G module U32. Pin 3 of the mobile 4G module U32 is connected to pin 56 of the main control chip U1. Pin 4 of the mobile 4G module U32 is connected to pin 55 of the main control chip U1. Pin 5 of the mobile 4G module U32 is connected to pin 3 of the digital transistor Q27. Pin 2 of the digital transistor Q27 is grounded. Pin 1 of the digital transistor Q27 is connected to pin 67 of the main control chip U1. Pin 6 of the mobile 4G module U32 is connected to pin 64 of the main control chip U1. Pin 7 of the mobile 4G module U32 is connected to pin 63 of the main control chip U1. The positioning circuit includes a satellite positioning module U34, which is used to locate the vehicle's journey and can further monitor the hydrogen storage tank.

[0043] Working principle: The temperature acquisition module, pressure acquisition module, and concentration acquisition module respectively acquire the temperature signal, pressure signal, and concentration signal inside the gas storage cylinder and transmit the data to the main control chip U1. The main control chip U1 analyzes and processes the data. If an abnormality is detected, it outputs a control signal to issue start / stop operation commands to the solenoid valve. The power output detection module includes current detection and voltage detection. Since each device has a stable operating voltage or current, the power output detection module obtains the current operating voltage or current of the device and outputs it to the main control chip U1. The main control chip U1 then analyzes whether the device has a short circuit or open circuit fault. If an abnormality is detected, the main control chip U1 issues a corresponding fault code for different faults, which is convenient for users to check. This allows for more accurate detection of the cause of abnormal conditions and improves safety.

[0044] The above embodiments do not limit the scope of protection of this utility model. All equivalent modifications and variations made by those skilled in the art without departing from the overall concept of this utility model shall still fall within the scope of this utility model.

Claims

1. A hydrogen supply monitoring circuit structure for an on-board hydrogen storage cylinder, characterized in that, The application relates to a temperature, pressure and concentration monitoring system for a fuel cell, which comprises a main control module, a temperature acquisition module, a pressure acquisition module, a concentration acquisition module and a power output detection module, wherein the input end of the main control module is connected with the output end of the temperature acquisition module, the pressure acquisition module, the concentration acquisition module and the power output detection module, the output end of the main control module is connected with an electromagnetic valve through a control circuit, and the communication end of the main control module is connected with a wireless communication module. The main control module comprises a main control chip U1, which is connected with a filter circuit, a debugging circuit and an oscillation circuit. The power output detection module comprises a current detection circuit and a voltage detection circuit, the current detection circuit comprises a current sensor U4, the input end of the current sensor U4 is connected with the power supply end of the electromagnetic valve, and the output end of the current sensor U4 is connected with the input end of the main control chip U1; the voltage detection circuit comprises a field effect tube Q3, the input end of the field effect tube Q3 is connected with the power supply end of the pressure sensor, and the output end of the field effect tube Q3 is connected with the input end of the main control chip U1.

2. The hydrogen supply monitoring circuit structure for the on-board hydrogen storage cylinder according to claim 1, wherein The eighth pin of the main control chip U1 is connected with a working indicator lamp LED2 in series, and the ninth pin of the main control chip U1 is connected with a stop indicator lamp LED3 in series.

3. The hydrogen supply monitoring circuit structure for the on-board hydrogen storage cylinder according to claim 1, wherein The temperature acquisition module comprises a multiplexer U25, the input end of the multiplexer U25 is connected with a temperature sensor, and the output end of the multiplexer U25 is connected with the input end of the main control chip U1.

4. The hydrogen supply monitoring circuit structure for the on-board hydrogen storage cylinder according to claim 1, wherein The pressure acquisition module comprises an operational amplifier U411 and an operational amplifier U412, the input end of the operational amplifier U411 is connected with a low-pressure pressure sensor, and the output end of the operational amplifier U411 is connected with the input end of the main control chip U1; the input end of the operational amplifier U412 is connected with a high-pressure pressure sensor, and the output end of the operational amplifier U412 is connected with the input end of the main control chip U1.

5. The hydrogen supply monitoring circuit structure for the on-board hydrogen storage cylinder according to claim 1, wherein The concentration acquisition module comprises a PWM signal circuit and an analog signal circuit, the PWM signal circuit comprises a triode Q17, the base of the triode Q17 is connected with a PWM concentration sensor, the collector of the triode Q17 is connected with the input end of the main control chip U1, the emitter of the triode Q17 is grounded DGND, and the capacitor C64 and the resistor 136 are connected between the base and the emitter; the analog signal circuit comprises an operational amplifier U381 and an operational amplifier U382, the input end of the operational amplifier U381 and the operational amplifier U382 is respectively connected with an analog concentration sensor, and the output end of the operational amplifier U381 and the operational amplifier U382 is respectively connected with the input end of the main control chip U1.

6. The hydrogen supply monitoring circuit structure for the on-board hydrogen storage cylinder according to claim 1, wherein The control circuit includes field effect tube Q30, triode Q31, digital transistor Q6 and current sensing amplifier U421, the output end of the master chip U1 is connected with the 1st pin of digital transistor Q6, the 2nd pin of digital transistor Q6 is grounded, the 3rd pin of digital transistor Q6 is connected with the base of triode Q31, the collector of triode Q31 is connected with the 4th pin of field effect tube Q30, the 5th pin-8th pin of field effect tube Q30 is connected with electromagnetic valve, the 1st pin-3rd pin of field effect tube Q30 is connected with the input end of current sensing amplifier U421, the output end of current sensing amplifier U421 is connected with the input end of master chip U1.

7. The hydrogen supply monitoring circuit structure for the on-board hydrogen storage cylinder according to claim 1, wherein The wireless communication module includes networking circuit, the networking circuit includes mobile 4G module U32, the 3rd pin of mobile 4G module U32 is connected with the 56th pin of master chip U1, the 4th pin of mobile 4G module U32 is connected with the 55th pin of master chip U1, the 5th pin of mobile 4G module U32 is connected with the 3rd pin of digital transistor Q27, the 2nd pin of digital transistor Q27 is grounded, the 1st pin of digital transistor Q27 is connected with the 67th pin of master chip U1, the 6th pin of mobile 4G module U32 is connected with the 64th pin of master chip U1, the 7th pin of mobile 4G module U32 is connected with the 63th pin of master chip U1.

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