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

Abstract

The invention 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 output detection module, and is characterized in that the input end of the main control module is connected with the power 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] The present invention relates to a monitoring circuit, in particular to a hydrogen supply monitoring circuit structure for on-vehicle hydrogen storage cylinders. Background Art

[0002] A hydrogen storage cylinder is a high-pressure container for storing hydrogen. During the hydrogen supply process of the hydrogen storage cylinder, abnormal conditions are likely to occur in the temperature, pressure, concentration inside the hydrogen storage cylinder, and the valve wire harness at the bottle mouth. If not discovered in time, major safety hazards are likely to occur.

[0003] In the prior art, temperature sensors, pressure sensors, hydrogen concentration sensors, and controllers are provided in the hydrogen supply system to detect and control the state of the hydrogen supply system to ensure the safety of the hydrogen supply system. However, the functions of such an on-vehicle hydrogen supply control system are relatively simple, and it cannot deeply analyze and process abnormal results, and the execution processing strategy is not precise enough, which is also likely to lead to misoperations and low safety. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a hydrogen supply monitoring circuit structure for on-vehicle hydrogen storage cylinders.

[0005] The technical solution adopted by the present invention to solve its technical problems is: A hydrogen supply monitoring circuit structure for on-vehicle hydrogen storage cylinders, including a main control module, a temperature acquisition module, a pressure acquisition module, a concentration acquisition module, and a power output detection module. The input ends of the main control module are respectively connected to the output ends 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 to a solenoid valve through a control circuit; the communication end of the main control module is connected to a wireless communication module.

[0006] The main control module includes a main control chip U1, and 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 are connected in parallel between voltage 3V3 and ground DGND. Capacitors C8 - C10 are connected in parallel between voltage A3V3 and ground AGND. Capacitors C11 - C13 are connected in parallel between voltage VERF3V and ground AGND.

[0007] A working indicator LED2 is connected in series to the 8th pin of the main control chip U1, and a stop indicator LED3 is connected in series to the 9th pin of the main control chip U1.

[0008] 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 end of the current sensor U4 is connected to the power supply end of the solenoid valve, and the output end of the current sensor U4 is connected to the input end of the main control chip U1. The voltage detection circuit includes a field effect transistor Q3. The input end of the field effect transistor Q3 is connected to the power supply end of the pressure sensor, and the output end of the field effect transistor Q3 is connected to the input end of the main control chip U1.

[0009] The temperature acquisition module includes a multiplexer U25. The input end of the multiplexer U25 is connected to the temperature sensor, and the output end is connected to the input end of the main control chip U1.

[0010] The pressure acquisition module includes operational amplifiers U411 and U412. The input end of the operational amplifier U411 is connected to the low-pressure pressure sensor, and the output end is connected to the input end of the main control chip U1. The input end of the operational amplifier U412 is connected to the high-pressure pressure sensor, and the output end is connected to the input end of the main control chip U1.

[0011] The concentration acquisition module includes a PWM signal circuit and an analog signal circuit. The PWM signal circuit includes a triode Q17. The base of the triode Q17 is connected to the PWM concentration sensor, the collector of the triode Q17 is connected to the input end of the main control chip U1, the emitter of the triode Q17 is grounded, and a capacitor C64 and a resistor 136 are connected between the base and the emitter. The analog signal circuit includes operational amplifiers U381 and U382. The input ends of the operational amplifiers U381 and U382 are respectively connected to the analog concentration sensors, and the output ends are respectively connected to the input end of the main control chip U1.

[0012] The control circuit includes a field effect transistor Q30, a triode Q31, a digital transistor Q6, and a current sensing amplifier U421. The output end 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 triode Q31. The collector of the triode 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 jointly connected to the solenoid valve. The first to third pins of the field effect transistor Q30 are jointly connected to the input end of the current sensing amplifier U421. The output end of the current sensing amplifier U421 is connected to the input end of the main control chip U1.

[0013] The wireless communication module includes a networking circuit, and the networking circuit includes a mobile 4G module U32. The 3rd pin of the mobile 4G module U32 is connected to the 56th pin of the main control chip U1. The 4th pin of the mobile 4G module U32 is connected to the 55th pin of the main control chip U1. The 5th pin of the mobile 4G module U32 is connected to the 3rd pin of the digital transistor Q27. The 2nd pin of the digital transistor Q27 is grounded. The 1st pin of the digital transistor Q27 is connected to the 67th pin of the main control chip U1. The 6th pin of the mobile 4G module U32 is connected to the 64th pin of the main control chip U1. The 7th pin of the mobile 4G module U32 is connected to the 63rd pin of the main control chip U1.

[0014] The beneficial effects of the present invention are as follows: A power output detection module is connected to the input end of the main control module of the present invention. The working voltage or working current of devices such as the current solenoid valve, pressure sensor, or temperature sensor is obtained through the power output detection module, and these data are transmitted to the main control module. The main control module analyzes whether there are short - circuit or open - circuit faults in the devices, so as to more accurately detect the cause of abnormal conditions, thereby avoiding misoperations and improving safety.

[0015] In addition, the present invention further includes a temperature acquisition module, a pressure acquisition module, and a concentration acquisition module to monitor the state of the hydrogen storage cylinder in real - time and take timely treatment measures in case of abnormal situations. Brief Description of the Drawings

[0016] The present invention will be further described below in conjunction with the drawings and embodiments.

[0017] Figure 1 is the principle block diagram of the present invention.

[0018] Figure 2 is the circuit schematic diagram of the main control module.

[0019] Figure 3 is the circuit schematic diagram of the power supply module.

[0020] Figure 4 is the circuit schematic diagram of the current detection circuit.

[0021] Figure 5 is the circuit schematic diagram of the voltage detection circuit.

[0022] Figure 6 is the circuit schematic diagram of the temperature acquisition module.

[0023] Figure 7 is the circuit schematic diagram of the pressure acquisition module.

[0024] Figure 8 is the circuit schematic diagram of the concentration acquisition module.

[0025] Figure 9 It is the circuit schematic diagram of the control circuit.

[0026] Figure 10 It is the circuit schematic diagram of the data inter - transmission module.

[0027] Figure 11 It is the circuit schematic diagram of the wireless communication module. Detailed implementation manners

[0028] Referring to Figure 1 , a hydrogen supply monitoring circuit structure for a vehicle - mounted 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 ends of the main control module are respectively connected to the output ends 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 to a solenoid valve through a control circuit; the communication end of the main control module is connected to a wireless communication module. In the present invention, a power output detection module is connected to the input end of the main control module. By detecting the working voltage and working current of the bottle valve, the solenoid valve and the sensor through the power output detection module, whether an abnormal condition occurs can be detected more accurately, improving safety. In addition, it has functions of temperature acquisition, pressure acquisition, concentration acquisition and detection and control of the solenoid valve, can realize the state monitoring and hydrogen supply control of the hydrogen supply system, and take timely treatment measures in case of abnormal conditions.

[0029] Figures 2 to 11 Combined, they are the complete circuit schematic diagram of this embodiment. For the convenience of observation, the complete circuit diagram is divided into 10 parts. Terminals with the same label in the figure indicate electrical connection.

[0030] Specifically, referring to Figure 2, the main control module includes a main control chip U1, and the main control chip U1 uses a common single-chip microcomputer. In this embodiment, the model of the single-chip microcomputer used by the main control chip U1 is HC32A4A0PITI-LQFP100. The main control chip U1 is connected to a filter circuit, a debugging circuit, and an oscillation circuit. The filter circuit includes capacitors C1 - C13. Capacitors C1 - C7 are connected in parallel between voltage 3V3 and ground DGND. Capacitors C8 - C10 are connected in parallel between voltage A3V3 and ground AGND. Capacitors C11 - C13 are connected in parallel between voltage VERF3V and ground AGND. The filter circuit is used to filter out interference signals. The debugging circuit includes a connector H1. The first pin of the connector H1 is connected to voltage A5V. The second pin of the connector H1 is connected to the 72nd pin of the main control chip U1 through a resistor R1. The third pin of the connector H1 is connected to the 76th pin of the main control chip U1 through a resistor R2. The fourth pin of the connector H1 is grounded. The debugging circuit is used for program input or debugging. A resistor R195 and a capacitor C103 are connected in series to the 14th pin of the main control chip U1 to make the signal for program input cleaner, reduce signal interference, and facilitate user use. The oscillation circuit includes a crystal oscillator X1. One path of the crystal oscillator X1 is connected to the 12th pin of the main control chip U1, and the other path is connected to the 13th pin of the main control chip U1. A capacitor C15 is connected between the 12th pin and ground DGND, and a capacitor C16 is connected between the 13th pin and ground DGND. The oscillation circuit can reduce the impact of surge current on the circuit. A working indicator LED2 is connected in series to the 8th pin of the main control chip U1, and a stop indicator LED3 is connected in series to the 9th pin of the main control chip U1. The working indicator LED2 and the stop indicator LED3 are used to indicate whether the solenoid valve starts and stops.

[0031] Refer to Figure 3 , Figure 3 Figure is the circuit schematic diagram of a typical power supply module given in this embodiment, including a voltage step-down chip U7, a voltage step-down chip U5, a voltage step-down chip U6, and a linear voltage regulator U13. The input end of the voltage step-down chip U7 is connected to a direct current with a voltage value of 24V. The label MAIN_24VIN in the figure is the positive pole of the 24V direct current. The voltage step-down chip U7 steps down the 24V direct current to 12V direct current. Among them, the direct current D12V+ is input to the voltage step-down chip U6, and the voltage step-down chip U6 steps down the 12V direct current voltage to direct current A5V+. The direct current A5V+ is used to supply power to the monitoring system; the direct current A12V+ is input to the voltage step-down chip U5, and the voltage step-down chip U5 steps down the 12V direct current voltage to direct current O5V+. The direct current O5V+ is used for output and supplies power to the outside to facilitate users to take power. The linear voltage regulator U13 steps down the direct current A5V+ to the working voltage 3V3 for the chip to work.

[0032] Referring to Figure 4 , Figure 4 which is the circuit schematic diagram of the current detection circuit given in this embodiment. The current detection circuit includes a current sensor U4. The first pin, second pin, third pin, and fourth pin of the current sensor U4 are connected to the power supply terminal of the solenoid valve for detecting 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 signal output.

[0033] In this embodiment, the detected current can be used to detect whether the wiring of the solenoid valve harness is short-circuited. A short circuit of the solenoid valve will cause overcurrent protection, and the overcurrent protection current can be set to 4A. When the current exceeds this value, the main control chip U1 will send out a solenoid valve short-circuit fault signal. It can also be used to detect whether the wiring of the solenoid valve harness is open. Specifically, when it is open, the current in the circuit is 0A, and at this time, the main control chip U1 will send out a solenoid valve open-circuit fault signal.

[0034] Referring to Figure 5 , Figure 5 which is the circuit schematic diagram of the voltage detection circuit given in this embodiment. The voltage detection circuit includes the detection of 24V voltage, 12V voltage, and 5V voltage. Among them, the detection of 12V voltage and 5V voltage includes a field effect transistor Q3. The model of the field effect transistor Q3 is 4953. In the figure, the label D is the drain of the field effect transistor Q3, S is the source of the field effect transistor Q3, and G is the gate of the field effect transistor Q3. The drain of the effect transistor Q3 serves as the voltage detection input terminal, and the gate serves as the output terminal of the voltage detection. Specifically, the fifth pin and the sixth pin of the field effect transistor Q3 are used to connect devices with a supply voltage of 12V, and the seventh pin and the eighth pin are used to connect devices with a supply voltage of 5V. It also includes fuses F1 - F4, TVS diode D10, TVS diode D13, Schottky diode D9, and Schottky diode D12. The labels OUT_DC12V1 and OUT_DC12V2 are connected to sensors powered by 12V, and the labels OUT_DC5V1 and OUT_DC5V2 are connected to sensors powered by 5V. The second pin of the field effect transistor Q3 is connected to the 40th pin of the main control chip U1 through a digital transistor Q5, and the fourth pin of the field effect transistor Q3 is connected to the 39th pin of the main control chip U1 through a digital transistor Q5. In this embodiment, the detection of 24V voltage includes a field effect transistor Q1. The drain of the field effect transistor Q1 is connected to the device that needs to detect the 24V power supply. A resistor R22 and a digital transistor Q2 are connected in series between the gate of the field effect transistor Q1 and the 38th pin of the main control chip U1.

[0035] In this embodiment, voltage detection can be used to detect whether the sensor is short-circuited. For example, for the low-voltage sensor fault voltage range: the operating voltage ≤ 0.25V or the operating voltage ≥ 4.75V. If the main control chip U1 detects that the operating voltage exceeds the above range, it will output a low-voltage sensor fault signal. Another example is the detection of the temperature sensor. A short circuit of the temperature sensor will not cause overcurrent protection, but the main control chip U1 will detect that the acquisition resistance is 0Ω, and then output a temperature sensor short-circuit fault. If the acquired resistance is infinite, an open-circuit fault of the temperature sensor will be output. For different fault signals, the main control chip U1 can issue corresponding fault codes for the user to view. In addition, voltage detection can also detect whether the power supply of the system circuit is abnormal, that is, a path is led from the power supply to the chip to the voltage detection circuit, which can achieve the self-checking effect.

[0036] Refer to Figure 6 , Figure 6 is the circuit schematic diagram of the temperature acquisition module given in this embodiment. The temperature acquisition module includes a multiplexer U25. In this embodiment, three temperature acquisition circuits are provided. In the actual use process, the corresponding circuits can be added according to the requirements. Specifically, the 13th to 15th pins of the multiplexer U25 are used to obtain the signals for temperature acquisition. The labels BOTTLETEMP1+ and BOTTLETEMP1- in the figure are the temperature signals input by the temperature sensor. The positive terminal is connected to the 13th pin through the inductor L10 and the resistor R92. A capacitor C53, a TVS diode D49, and a resistor R96 are connected in parallel between the positive terminal and the negative terminal. The 3rd pin of the multiplexer U25 is connected to the 30th pin of the main control chip U1 through the resistor R25. The 9th to 11th pins of the multiplexer U25 are respectively connected to the 51st to 53rd pins of the main control chip U1 in sequence.

[0037] Refer to Figure 7 , Figure 7This is the circuit schematic diagram of the pressure acquisition module given in this embodiment. The pressure acquisition module includes operational amplifier U411 and operational amplifier U412. The operational amplifier U411 and operational amplifier U412 together form a complete operational amplifier, with the model number GS8552-SR. Among them, the 3rd pin of the operational amplifier U411 is connected to the low-pressure pressure sensor through resistor R157 and inductor L25. Capacitor C72 and resistor R163 are connected to the input end of the 3rd pin to make the input signal more stable. The 4th pin of the operational amplifier U411 is grounded to DGND. The 2nd pin of the operational amplifier U411 is connected to the 1st pin. The 1st pin is connected to the 25th pin of the main control chip U1 through resistor R158. Resistor R161 and TVS diode D70 are connected to the output end of the 1st pin to make the output signal more stable. The connection method of the operational amplifier U412 is the same as that of the operational amplifier U411. The difference is that the input end of the operational amplifier U411 is connected to the low-pressure pressure sensor, and the input end of the operational amplifier U412 is connected to the high-pressure pressure sensor. The output end of the operational amplifier U412 is connected to the 26th pin of the main control chip U1. The two paths are used to detect the high-pressure value and low-pressure value of the hydrogen storage cylinder respectively.

[0038] Refer to Figure 8 , Figure 8This is the circuit schematic diagram of the concentration acquisition module given in this embodiment. The concentration acquisition module includes a PWM signal circuit and an analog signal circuit, and is used to detect whether hydrogen leaks. The PWM signal circuit includes a triode Q17. The base of the triode 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 bottle and transmits a PWM signal. A TVS diode D60 is connected to the output end of the PWM concentration sensor to make the output signal more stable. The collector of the triode Q17 is connected to the input end of the main control chip U1, and the emitter of the triode 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 operational amplifiers U381 and U382. The operational amplifier U381 and the operational amplifier U382 together form a complete operational amplifier, and the model is GS8552-SR. The operational amplifiers U381 and U382 are two-channel detection circuits, which are used to detect the concentration values of different hydrogen storage bottles respectively. The input ends of the operational amplifiers U381 and U382 are respectively connected to analog concentration sensors, and the analog concentration sensors output analog signals. Specifically, the 3rd pin of the operational amplifier U381 is connected to the analog concentration sensor through a resistor R137 and an inductor L21. A capacitor C65 and a resistor R140 are connected to the input end of the 3rd pin to make the input signal more stable. The 4th pin of the operational amplifier U381 is grounded to DGND. The 2nd pin of the operational amplifier U381 is connected to the 1st pin. The 1st pin is connected to the 15th pin of the main control chip U1 through a resistor R133. A resistor R138 and a TVS diode D61 are connected to the output end of the 1st pin to make the output signal more stable. The connection method of the operational amplifier U382 is the same as that of the operational amplifier U381, and the output end of the operational amplifier U382 is connected to the 16th pin of the main control chip U1.

[0039] Refer to Figure 9 , Figure 9is the circuit schematic diagram of the control circuit given in this embodiment. The control circuit includes a single-way valve control circuit and a main-way valve control circuit. The single-way valve control circuit includes a field-effect transistor Q30, a triode 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 triode Q31 through a resistor R49. A resistor R43 and a resistor R46 are connected between the base and the emitter of the triode Q31. The collector of the triode 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 commonly connected to the solenoid valve. The above circuit is used to control the start and stop of the solenoid valve. The first to third pins of the field-effect transistor Q30 are commonly connected to the third pin of the input end of the current sensing amplifier U421. The first pin of the output end of the current sensing amplifier U421 is connected to the twelfth pin of the input end of the multiplexer U25, and then connected to the main control chip U1 through the output end of the multiplexer U25. This circuit is used to detect whether the solenoid valve is working abnormally. Since there are several solenoid valves in the system, and each solenoid valve requires a detection and control circuit, a current sensing amplifier with the model number INA4180A2QPWRQ1 can be used. One current sensing amplifier can detect at most four channels. For the detection of 4 solenoid valves, it is convenient to use. The connection method of the main-way valve control circuit is roughly the same as that of the single-way valve control circuit, except that the model of the current sensing amplifier U8 used is INA180A2QDBVRQ1, which can detect a single channel.

[0040] Refer to Figure 10 , Figure 10 is the circuit schematic diagram of the data intercommunication module given in this embodiment. The data intercommunication module includes an RS485 circuit and a CAN circuit. The RS485 circuit and the CAN circuit are used to externally connect RS485 and CAN interfaces, which can be used by the upper computer for data transmission backup. The RS485 circuit includes an RS485 transceiver U28. The first to fourth pins of the RS485 transceiver U28 are connected to the main control chip U1. The sixth and seventh pins of the RS485 transceiver U28 are connected to the external communication interface. The CAN circuit includes a CAN transceiver U30. The second and third pins of the CAN transceiver U30 are connected to the main control chip U1. The sixth and seventh pins of the CAN transceiver U30 are connected to the external communication interface through a common mode filter.

[0041] Refer to Figure 11 , Figure 11It is the circuit schematic diagram of the wireless communication module given in this embodiment. The wireless communication module includes a networking circuit and a positioning circuit. The networking circuit can communicate with the background, receive the fault codes sent by the main control chip U1, and facilitate remote viewing by the user. The networking circuit includes a mobile 4G module U32. The 3rd pin of the mobile 4G module U32 is connected to the 56th pin of the main control chip U1. The 4th pin of the mobile 4G module U32 is connected to the 55th pin of the main control chip U1. The 5th pin of the mobile 4G module U32 is connected to the 3rd pin of the digital transistor Q27. The 2nd pin of the digital transistor Q27 is grounded. The 1st pin of the digital transistor Q27 is connected to the 67th pin of the main control chip U1. The 6th pin of the mobile 4G module U32 is connected to the 64th pin of the main control chip U1. The 7th pin of the mobile 4G module U32 is connected to the 63rd pin of the main control chip U1. The positioning circuit includes a satellite positioning module U34. The satellite positioning module U34 is used to locate the vehicle journey and can further monitor the hydrogen storage cylinder.

[0042] 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 for analysis and processing by the main control chip U1. If it is abnormal, a control signal is output to issue an operation instruction for starting and stopping the solenoid valve; The power output detection module includes current detection and voltage detection. Since each device has a stable operating voltage or current during operation, the current operating voltage or current of the current device is obtained according to the power output detection module and output to the main control chip U1. Then, the main control chip U1 analyzes whether the device has a short circuit or open circuit fault. If it is abnormal, for different faults, the main control chip U1 issues corresponding fault codes for the user to view, which can more accurately detect the cause of the abnormal situation and improve safety.

[0043] The above embodiments cannot limit the protection scope of the present invention. Those skilled in the professional technical field, without departing from the overall concept of the present invention, make equal modifications and changes, which still fall within the scope covered by the present invention.

Claims

1. A hydrogen supply monitoring circuit structure for an in-vehicle hydrogen storage cylinder, characterized in that, It 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 ends of the main control module are respectively connected to the output ends 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 to a solenoid valve through a control circuit; the communication end of the main control module is connected to a wireless communication module.

2. The hydrogen supply monitoring circuit structure of the in-vehicle hydrogen storage cylinder according to claim 1, wherein The main control module includes a main control chip U1, and the main control chip U1 is connected to a filtering circuit, a debugging circuit, and an oscillation circuit.

3. The hydrogen supply monitoring circuit structure of the in-vehicle hydrogen storage cylinder according to claim 2, characterized in that The filtering circuit includes capacitors C1 - C13. Capacitors C1 - C7 are connected in parallel between voltage 3V3 and ground DGND. Capacitors C8 - C10 are connected in parallel between voltage A3V3 and ground AGND. Capacitors C11 - C13 are connected in parallel between voltage VERF3V and ground AGND.

4. The hydrogen supply monitoring circuit structure of the in-vehicle hydrogen storage cylinder according to claim 2, characterized in that A working indicator LED2 is connected in series to the 8th pin of the main control chip U1, and a stop indicator LED3 is connected in series to the 9th pin of the main control chip U1.

5. The hydrogen supply monitoring circuit structure of the in-vehicle hydrogen storage cylinder according to claim 2, characterized in that 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 end of the current sensor U4 is connected to the power supply end of the solenoid valve, and the output end of the current sensor U4 is connected to the input end of the main control chip U1; the voltage detection circuit includes a field effect transistor Q3. The input end of the field effect transistor Q3 is connected to the power supply end of the pressure sensor, and the output end of the field effect transistor Q3 is connected to the input end of the main control chip U1.

6. The hydrogen supply monitoring circuit structure of the in-vehicle hydrogen storage cylinder according to claim 2, wherein The temperature acquisition module includes a multiplexer U25. The input end of the multiplexer U25 is connected to a temperature sensor, and the output end is connected to the input end of the main control chip U1.

7. The hydrogen supply monitoring circuit structure of the in-vehicle hydrogen storage cylinder according to claim 2, characterized in that The pressure acquisition module includes operational amplifiers U411 and U412. The input end of the operational amplifier U411 is connected to a low - pressure pressure sensor, and the output end is connected to the input end of the main control chip U1; the input end of the operational amplifier U412 is connected to a high - pressure pressure sensor, and the output end is connected to the input end of the main control chip U1.

8. The hydrogen supply monitoring circuit structure of the in-vehicle hydrogen storage cylinder according to claim 2, characterized in that The concentration acquisition module includes a PWM signal circuit and an analog signal circuit. The PWM signal circuit includes a triode Q17. The base of the triode Q17 is connected to a PWM concentration sensor, the collector of the triode Q17 is connected to the input end of the main control chip U1, the emitter of the triode Q17 is grounded to DGND, and a capacitor C64 and a resistor 136 are connected between the base and the emitter; the analog signal circuit includes operational amplifiers U381 and U382. The input ends of the operational amplifiers U381 and U382 are respectively connected to an analog - quantity concentration sensor, and the output ends are respectively connected to the input end of the main control chip U1.

9. The hydrogen supply monitoring circuit structure of the in-vehicle hydrogen storage cylinder according to claim 2, characterized in that The control circuit includes a field effect transistor Q30, a triode Q31, a digital transistor Q6, and a current sensing amplifier U421. The output end 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 triode Q31. The collector of the triode 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 commonly connected to the solenoid valve. The first to third pins of the field effect transistor Q30 are commonly connected to the input end of the current sensing amplifier U421. The output end of the current sensing amplifier U421 is connected to the input end of the main control chip U1.

10. The hydrogen supply monitoring circuit structure of the in-vehicle hydrogen storage cylinder according to claim 2, characterized in that The wireless communication module includes a networking circuit. The networking circuit includes a mobile 4G module U32. The third pin of the mobile 4G module U32 is connected to the 56th pin of the main control chip U1. The fourth pin of the mobile 4G module U32 is connected to the 55th pin of the main control chip U1. The fifth pin of the mobile 4G module U32 is connected to the third pin of the digital transistor Q27. The second pin of the digital transistor Q27 is grounded. The first pin of the digital transistor Q27 is connected to the 67th pin of the main control chip U1. The sixth pin of the mobile 4G module U32 is connected to the 64th pin of the main control chip U1. The seventh pin of the mobile 4G module U32 is connected to the 63rd pin of the main control chip U1.

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