A controller for a hydrogen fuel cell system

Abstract

This invention discloses a controller for a hydrogen fuel cell system. The controller circuit board of this application integrates various chips and components to achieve high-density new product integration functions. It can simultaneously ensure the normal operation of all electrical equipment on the three major pipelines of air, hydrogen and water. By collecting signals such as voltage, current and temperature, it controls the opening or closing of various valves, motors and electrical equipment on the corresponding pipelines. Compared with traditional controllers, the biggest features of this controller are stability, multiple signal capabilities and small size. It can drive dozens of signals simultaneously, and its functions can be easily expanded and upgraded in the future, making it suitable for use on engines of different power.

Description

Technical Field

[0001] This invention belongs to the field of fuel cell technology, and specifically relates to a controller for a hydrogen fuel cell system. Background Technology

[0002] A fuel cell is an energy conversion device that converts the chemical energy of hydrogen into electrical energy. Hydrogen and oxygen continuously output electrical energy through an electrochemical reaction, offering advantages such as high energy conversion efficiency and zero pollution and emissions. A standalone fuel cell cannot generate electricity; it must be integrated with a fuel supply and circulation system, an oxidant supply system, a water / heat management system, and a control system to form a fuel cell system that can output power. All these systems require control to function, and fuel cell system controllers can have distributed or centralized control structures.

[0003] In fuel cell systems, components such as the cooling fan in the heat dissipation system, the air compressor in the air supply, and the high-power switching transistors in the DC-DC converter all operate in switching mode, causing strong electromagnetic interference to the fuel cell system. This places high demands on the electromagnetic compatibility of the fuel cell system controller. Simultaneously, the fuel cell system controller also needs to collect sensor signals and switching signals, drive and control solenoid valves, DC motors, etc. The system has a large workload and complex software system, which places higher demands on the controller's core processor and also presents new requirements for the software architecture.

[0004] Currently available controllers suffer from several hardware limitations. Most have a core processor that is typically a 16-bit single-core processor, resulting in slow data processing speed and low efficiency. Their signal output and acquisition ports are limited, failing to meet the demands of complex data types. Regarding communication interfaces, they lack multi-channel CAN bus communication interfaces, hindering the independent control of multiple CAN devices within the fuel cell system. When driving high-power loads, they generally employ relay drives, lacking fault diagnosis capabilities. Furthermore, in terms of EMC design, they lack a power management system and electromagnetic compatibility, failing to meet the requirements for fuel cell vehicles operating in complex electromagnetic environments.

[0005] In summary, there is a need to provide a controller for hydrogen fuel cell systems that can overcome the shortcomings of existing technologies. Summary of the Invention

[0006] To address the shortcomings of existing control technologies, this invention provides a controller for a hydrogen fuel cell system. This controller complies with the ISO26262 international automotive safety standard and can ensure the safe and stable operation of the fuel cell and its system.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a controller for a hydrogen fuel cell system, comprising: a signal acquisition module for receiving signals from sensors within the hydrogen fuel cell system;

[0008] The signal output module is used to connect to the actuator of the hydrogen fuel cell system and output adjustment signals.

[0009] The communication module is used to connect the CAN and Modbus devices of the hydrogen fuel cell system.

[0010] The debugging module is used to connect to the processor on the controller board of the hydrogen fuel cell system;

[0011] The processor is used to connect the signal acquisition module, signal output module, communication module, debugging module and power management module in the controller to monitor and modify various parameters of the fuel cell system in real time.

[0012] The power management module is used to supply power to the various modules within the controller.

[0013] Furthermore, the signal acquisition module includes an analog signal acquisition unit and a digital signal acquisition unit. The analog signal acquisition unit is used to receive signals from the analog sensors of the hydrogen fuel cell system and acquire external liquid level switch signals. The digital signal acquisition unit receives signals from the digital sensors of the hydrogen fuel cell system and acquires external pressure, temperature, flow rate, voltage, current and humidity signals.

[0014] Furthermore, the signal output module includes a DA output module, a PWM output module, a high-side drive module, and a DC motor drive module;

[0015] The A output unit uses a dedicated 16-bit DA chip and a dedicated rail-to-rail operational amplifier combination circuit. A dedicated current conversion chip is added after the circuit to convert 0-5V voltage signals into 0-20mA or 4-20mA standard current signals. The PWM output module is driven by transistors or MOSFETs. The high-side drive module uses a dedicated integrated chip with four high-current output channels and independent I / O port control. The DC motor drive module uses a dedicated motor drive chip with dual-channel motor drive, capable of speed regulation by changing the duty cycle through PWM, and can change the motor's forward and reverse rotation. Motor direction can be achieved through both I / O ports A and B.

[0016] Furthermore, the communication module includes a CAN communication unit and a Modbus communication unit. The CAN communication unit includes several CAN buses, and each CAN device of the hydrogen fuel cell system is connected to the processor through a CAN bus. The Modbus communication unit includes several Modbus lines, and each serial communication device of the hydrogen fuel cell system is connected to the processor through a Modbus line.

[0017] Furthermore, the debugging module includes a JTAG debugging port, which connects to the processor on the controller board of the hydrogen fuel cell system.

[0018] Furthermore, the processor integrates a 16-bit AD arithmetic unit with two channels, each of which is divided into 32 acquisition units, allowing it to simultaneously acquire 64 external analog signal inputs. The operational amplifier circuit can amplify external 0-20mA standard signals into voltage signals that the processor can recognize.

[0019] Furthermore, the power management module includes a 24V voltage conversion circuit, a 12V voltage conversion circuit, a 5V voltage conversion circuit, and a sampling reference voltage conversion circuit.

[0020] Furthermore, the controller also includes a power safety module to ensure the stability of voltage and current in the power supply circuit.

[0021] Furthermore, the power safety module includes a TVS diode, an LC filter circuit, a large inductor to isolate the power and ground signals, and a large electrolytic capacitor to filter the signal.

[0022] Furthermore, all modules of the controller are encapsulated in an aluminum housing, and the modules are installed via connectors with an IP67 protection rating. Gaps in the aluminum housing and gaps between the controller board and the connectors are sealed using adhesive.

[0023] Traditional controllers integrate numerous relays and various discrete components, resulting in excessively large circuit board controllers. The controller circuit board of this application achieves high-density integration by integrating various chips and components, enabling simultaneous normal operation of all electrical equipment on three major pipelines: air, hydrogen, and water. It controls the opening and closing of various valves, motors, and electrical equipment on the corresponding pipelines by collecting signals such as voltage, current, and temperature. Compared to traditional controllers, the biggest advantages of this controller are its stability, multiple signal capabilities, and small size. It can simultaneously drive dozens of signals, and its future expansion and upgrade functions are convenient, making it suitable for use in engines of different power ratings.

[0024] The advantages of this invention are as follows: It is a controller suitable for hydrogen fuel cell system control, possessing a robust hardware and software platform that complies with the ISO26262 international automotive safety standard. It also features protection against power-on surges, short circuits, overcurrent, overvoltage, and reverse connection. This meets the requirements of fuel cell systems for multi-sensor sampling, high-precision sampling, compatibility with different types of sensor signals, and a large number of control variables with high control accuracy. Furthermore, it exhibits good electromagnetic compatibility, an IP67 protection rating, and multiple CAN communication interfaces, supporting Bootloader program update functionality. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structural principle of the controller of the hydrogen fuel cell system according to an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of the output of the DA output unit in the embodiment.

[0027] Figure 3 This is a schematic diagram of the output of the PWM adjustable signal output unit in the embodiment.

[0028] Figure 4 This is a schematic diagram of the output of the intelligent high-side switch driving unit in the embodiment.

[0029] Figure 5 This is a schematic diagram of the output of the DC motor drive unit in the embodiment.

[0030] Figure 6 This is a schematic diagram of voltage acquisition signal in an embodiment.

[0031] Figure 7 This is a schematic diagram of the current acquisition signal in an embodiment.

[0032] Figure 8 This is a schematic diagram of the power safety module structure in an embodiment. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0034] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product or device.

[0035] like Figure 1 As shown, a controller for a hydrogen fuel cell system includes a processor, a signal output module, a signal acquisition module, a communication module, a debugging module, a power safety module, and a power management module.

[0036] The system includes: a signal acquisition module for receiving signals from sensors within the hydrogen fuel cell system; a signal output module for connecting to the actuators of the hydrogen fuel cell system and outputting adjustment signals; a communication module for connecting to the CAN and Modbus devices of the hydrogen fuel cell system; a debugging module for connecting to the processor on the controller board of the hydrogen fuel cell system; a processor for connecting to other modules within the controller to monitor and modify various system parameters in real time; and a power management module for supplying power to other modules within the controller.

[0037] The sensor components of a hydrogen fuel cell system include temperature sensors, pressure transmitters, flow transmitters, humidity sensors, and liquid level sensors, while the actuators include water-cooled fans, various valves, DC motors, and other equipment.

[0038] The processor uses a 32-bit ARM core, conforms to automotive-grade standards, and features the AEC-Q100 standard. It supports multiple CAN communication channels and allows for real-time monitoring and modification of system parameters via UART communication during online debugging and data monitoring. The power management chip circuitry is composed of automotive-grade high-current, low-power chips, a JTAG interface circuit, a dedicated PWM driver circuit, an AD sampling and filtering circuit, a DA output and operational amplifier circuit, and other circuit modules. The processor chip is a dedicated automotive VCU controller chip with multiple dedicated AD channels, multiple dedicated CAN channels, and multiple dedicated LSPI channels. The chip's internal clock can use an internal or external clock tree, achieving a 112MHz rate through PLL frequency multiplication. The power management chip conforms to the automotive-grade AEC-Q100 standard and features a wide operating range, high current capacity, small size, and simple peripheral circuitry. The JTAG interface circuit uses a standard 20-pin connector, directly connecting to the corresponding pins of the FS32K148 microcontroller. The PWM circuit features discrete circuitry with 24V and 5V selectable options. It can drive small-current PWM signals using transistors or large-current PWM signals using MOSFETs. It offers filtering and amplification capabilities, ensuring undistorted PWM waveforms. The frequency can be freely adjusted from 1Hz to 20kHz, providing a wide driving range. The AD sampling and filtering circuit features bypass decoupling capabilities, suitable for signal acquisition within the 0-5V range. It also allows for external 0-20mA current signal acquisition. The circuit design utilizes operational amplifiers to amplify small external signals without distortion before transmitting them to the corresponding pins of the microcontroller. This enables real-time adjustment of system parameters, ensuring interference-free signal transmission. The DA output circuit is composed of a 16-bit dedicated analog chip and a rail-to-rail dual operational amplifier chip at the back end. Its features include real-time updates, linear variation, and enhanced driving capability for small signals.

[0039] The signal output module includes a DA output unit, a PWM output unit, a high-side switch drive output unit, and a DC motor drive unit.

[0040] The DA output unit uses a dedicated 16-bit DA chip and a dedicated rail-to-rail operational amplifier combination circuit as a voltage follower amplifier. Through the processor's LSPI communication interface, it can linearly output a 0-5V analog signal. A dedicated current conversion chip is added to the subsequent stage of the circuit to convert the 0-5V voltage signal into a 0-20mA or 4-20mA standard current signal. Traditional fuel cell controllers mostly use standard 0-5V voltage signals to drive and control electrical equipment (such as ball valves), while our fuel cell controller uses standard 0-20mA or 4-20mA current signals to drive and control ball valves. The biggest advantage of using standard 0-20mA or 4-20mA current signal transmission is its strong anti-interference capability. The signal can be transmitted completely and intact to the actuator. During transmission, the signal will not be lost due to excessively long wiring or wiring interference. After receiving the signal, the electrical components accurately control the operation of the actuators, thus improving the system's safety and stability. Figure 2 As shown.

[0041] The PWM adjustable signal output unit employs a discrete component design, offering high flexibility. It can be driven by either transistors or MOSFETs, with the choice of transistor or MOSFET depending on the load current. Compared to PWM signals driven by integrated chips, it provides excellent frequency range and drive current adjustment. Furthermore, it can be configured with multiple PWM signal outputs, each with independently adjustable frequency and duty cycle to meet the driving requirements of different devices. For example, a fan may require a 200Hz drive frequency to operate, while a valve may require a 6kHz drive frequency. Such a circuit allows for independent design of the output frequency for each device. Figure 3 As shown.

[0042] The intelligent high-side switch driver unit uses a dedicated integrated chip. This chip has four high-current output channels, independent I / O port control, and features overcurrent protection and short-circuit protection for downstream loads. It has strong anti-interference capabilities and can effectively drive various solenoid valves while protecting their lifespan. Compared to traditional relay-driven high-current signal components like solenoid valves, this intelligent high-side chip circuit has load short-circuit protection and overcurrent / undercurrent detection functions. The chip's switching output can be controlled by a microcontroller's I / O port to turn the power output on and off, thereby controlling the open and closed states of the solenoid valve. Figure 4 As shown.

[0043] The DC motor drive unit uses a dedicated motor drive chip with dual-channel motor drive. It can achieve speed control by changing the duty cycle of the PWM signal, and can switch the motor between forward and reverse rotation. Motor direction can be controlled through two sets of I / O ports, A and B. It has excellent protection functions against motor overcurrent, idling, and dead running, ensuring the motor's lifespan. The motor speed is determined by the duty cycle of the PWM signal on the MCU pin; a larger duty cycle results in a faster speed, and a smaller duty cycle results in a slower speed. Figure 5 As shown.

[0044] The signal acquisition module comprises a digital signal acquisition unit and an analog signal acquisition unit. The digital signal acquisition unit acquires external liquid level switch signals from photoelectric sensors, which are then processed by the processor to drive relevant devices. The analog signal unit acquires external signals such as pressure, temperature, flow rate, voltage, current, and humidity using a dedicated analog chip and operational amplifier circuit. This allows for accurate and real-time signal acquisition. The processor integrates a 16-bit AD converter with two channels, each divided into 32 acquisition units, enabling simultaneous acquisition of 64 external analog signal inputs. The operational amplifier circuit amplifies external 0-20mA standard signals into voltage signals recognizable by the processor. Through these dedicated circuits, the hydrogen fuel cell controller accurately and in real-time acquires information from the entire fuel cell system, ensuring accurate control of external actuators. For example, the pressure sensor signal is a 0-5V standard voltage signal. After voltage division by a precision resistor connected to the controller circuit board with three wires, and filtering by a capacitor, the signal is transmitted to the microcontroller's AD sampling pin. The program then calculates the pressure value currently acquired by the pressure sensor. The temperature sensor compares the internal resistance of two wires and transmits the data to the microcontroller's AD pin to determine the current temperature inside the pipe. The humidity sensor, also using two wires, collects humidity data, converts it into a 0-20mA current signal, which is then amplified by a dedicated operational amplifier and converted into a 0-5V voltage signal. This signal is then sent to the microcontroller's AD pin to determine the humidity level inside the external pipe. Figure 6 The voltage acquisition signal shown is as follows: Figure 7 The current acquisition signal is shown.

[0045] The communication module includes CAN communication, CANFD communication and Modbus communication. The CAN communication has three channels, and each CAN channel has an independent 32 data buffer. The transmission rate can be set independently. It can receive extended frame and standard frame data at the same time. It has CANBUS OFF diagnostic and treatment methods and conforms to the J1939 international standard communication protocol. The processor communicates with the vehicle controller via CAN2 to obtain the vehicle's required power and feeds it back to the vehicle's fuel cell system controller. The processor also communicates with the CAN devices within the hydrogen fuel cell system via CAN0, controlling the isolated boost DC-DC power supply, air compressor, various valves, and water pumps based on the required power from the vehicle controller. Furthermore, the processor communicates with the individual cell voltage monitoring system controller within the hydrogen fuel cell system via CAN1, monitoring the individual fuel cell voltage status in real time and providing timely feedback to the system controller. During commissioning, the operator can update the program to the processor via a dedicated host computer using a BootLoader via CAN0 at power-on. This can be done without removing the controller housing, through the vehicle's CAN diagnostic interface. CANFD is a software application that packages and transmits multiple CAN data frames. Modbus communication is primarily used by programmers for online debugging and monitoring of system parameters to ensure stable operation of the hydrogen fuel cell system, acquiring data and transmitting it to the host computer platform via the CAN network.

[0046] The debugging module includes a JTAG protocol interface, which has a 20-pin standard protocol interface and is used for online debugging and program updates of processor chips. This debugging circuit has strong anti-interference capabilities, fast data transmission speed, and completes transmission with only 4 wires, making it simple and reliable.

[0047] The power safety module comprises components such as a TVS diode, an LC filter circuit, a large inductor for isolating the power and ground signals, and a large electrolytic capacitor for filtering. This input power safety management circuit features protection against short circuits, voltage spikes during power-on, and reverse connection. It meets EMC testing standards and effectively protects the voltage and current stability of the DC24V to DC12V and DC24V to DC5V conversion circuits. When the external voltage is momentarily too high, the TVS diode clamps the input voltage within a safe range, preventing the DC conversion chip from burning out due to excessive external voltage. This circuit uses few components and provides a drive current of up to 3A, sufficient to supply voltage and current to the microcontroller. Figure 8 As shown.

[0048] The power management module includes a 24V voltage conversion circuit, a 12V voltage conversion circuit, a 5V voltage conversion circuit, and a sampling reference voltage conversion circuit. The 24V conversion circuit features low-pass filtering technology, TVS diode protection, and isolation between the external ground and the system control board's internal ground, effectively removing spike interference from external input power supplies and noise on the power lines, ensuring the safe and stable operation of the system control board. The 12V voltage conversion circuit is independently implemented using a DC-DC step-down chip, featuring high drive current and stable voltage output, capable of powering all 12V power supply devices within the hydrogen fuel cell system. The 5V voltage conversion circuit is independently implemented using a two-stage filtering circuit and a dedicated DC-DC step-down chip, featuring high drive current, stable and adjustable voltage, and processor-controlled chip startup and low-power modes, providing a stable operating voltage to the system control board and ensuring the normal operation of the processor chip. The reference voltage conversion circuit is completed by a low-power reference voltage chip, which can provide a stable 5V sampling reference voltage. This provides a stable and consistent sampling reference voltage to the AD module inside the processor, ensuring the consistency of the external analog signals acquired by the processor chip. This ensures that the hydrogen fuel cell system controller can accurately and effectively acquire the real data from various sensors, allowing the system to operate in its optimal state.

[0049] The controller of the hydrogen fuel cell system is encapsulated in a custom aluminum housing, which serves as electromagnetic shielding. The signal output module, signal acquisition module, communication module, debugging module, and power management module are connected to the processor through low-pass filter circuits. The use of low-pass filter circuits can improve the electromagnetic compatibility of the controller.

[0050] The hydrogen fuel cell system controller connects to external devices via an IP67-rated connector. Gaps in the custom aluminum housing and between the controller board and the connector are sealed with adhesive to provide waterproofing and dustproofing. The entire hydrogen fuel cell system controller features protection against power-on shock, short circuits, over-temperature, over-current, over-voltage, and reverse connection. It meets the requirements of multi-sensor sampling, high-precision sampling, compatibility with different types of sensor signals, and high control precision for a large number of control variables. It also possesses excellent electromagnetic compatibility, meeting the requirements of vehicles in complex electromagnetic environments. With an IP67 protection rating, it meets the requirements of harsh onboard environments. Furthermore, it features CAN and Modbus communication interfaces and supports bootloader program updates.

[0051] Specific advantages

[0052] 1. A controller suitable for fuel cell system control, featuring a powerful and practical hardware and software platform with high scalability and practicality. It can meet the needs of fuel cell systems with different power outputs, has good anti-interference capabilities, convenient software upgrades, low hardware configuration costs and reliable quality, good compatibility and expandability, and can control diverse signal drives. With the help of software programs, it can accurately drive water circuit, air circuit and hydrogen circuit equipment to operate simultaneously. It has manual mode and automatic mode switching functions.

[0053] 2. The DA module supports various standard signals, can control various components of this type of signal, and has a large number of control points.

[0054] 3. The analog signal module supports various standard signals and can be continuously interfaced with various sensor outputs to realize the application scenarios of complex sensors in fuel cell systems, and has a large number of acquisition points.

[0055] 4. The drive output modules are diverse and highly compatible, capable of driving different types of devices, such as DC motors, solenoid valves, ball valves, cooling fans, and other control devices, making them suitable for a variety of applications.

[0056] 5. The large number of CAN modules meets the communication and control needs of normal controllers and various CAN communication components, and also has CANFD communication function to meet complex communication scenarios.

[0057] 6. The power management module has a well-designed protection circuit with strong anti-interference capabilities, meets EMC testing standards, and can stably provide the controller board with various voltages and currents required by the controller board. It has safety measures such as short circuit, overvoltage, overcurrent, overtemperature, protection against power-on surges, and protection against reverse connection.

[0058] 7. The controller has a good protection rating, and is waterproof and dustproof, with a protection rating of IP67.

[0059] 8. The processor meets the AEC-Q100 standard and the safety standard ISO 26262.

[0060] 9. It has Modbus communication function, which can debug programs and monitor various system parameters online.

[0061] 10. Supports online programming and Bootloader program updates.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A controller for a hydrogen fuel cell system, characterized by The controller comprises: a signal acquisition module configured to receive signals from sensors in a hydrogen fuel cell system; a signal output module configured to be connected to an execution device of the hydrogen fuel cell system and output an adjustment signal; a communication module configured to be connected to CAN devices and Modbus devices of the hydrogen fuel cell system; a debugging module configured to be connected to a processor on a controller board of the hydrogen fuel cell system; a processor configured to be connected to the signal acquisition module, the signal output module, the communication module, the debugging module and a power management module in the controller, and to monitor and modify parameters of the hydrogen fuel cell system in real time; a power management module configured to supply power to each module in the controller; the signal output module comprises a DA output unit, a PWM output module, a high-side drive module and a DC motor drive module; the DA output unit comprises a dedicated 16-bit DA chip and a dedicated rail-to-rail operational amplifier combination circuit, and a dedicated current conversion chip is added to the rear stage of the circuit, so that a 0-5V voltage signal can be converted into a 0-20mA or 4-20mA standard current signal; the PWM output module is driven by a triode or a MOSFET tube; the high-side drive module comprises a dedicated integrated chip, the chip has four large-current output channels and independent I / O port control; and the DC motor drive module comprises a dedicated motor drive chip, has double-channel motor drive, can change the duty cycle through PWM to achieve the function of speed regulation, can change the functions of motor forward rotation and reverse rotation, and can realize motor steering operation through A and B two groups of I / O ports.

2. The controller of a hydrogen fuel cell system according to claim 1, characterized by: the signal acquisition module comprises an analog signal acquisition unit and a digital signal acquisition unit; the analog signal acquisition unit is configured to receive signals from analog sensors of the hydrogen fuel cell system and acquire external liquid level switch signals; the digital signal acquisition unit is configured to receive signals from digital sensors of the hydrogen fuel cell system and acquire external pressure, temperature, flow, voltage, current and humidity signals.

3. The controller of a hydrogen fuel cell system according to claim 1, characterized by: the communication module comprises a CAN communication unit and a Modbus communication unit; the CAN communication unit comprises a plurality of CAN buses, each CAN device of the hydrogen fuel cell system is connected to the processor through a CAN bus, and the Modbus communication unit comprises a plurality of Modbus lines, each serial communication device of the hydrogen fuel cell system is connected to the processor through a Modbus line.

4. The controller of a hydrogen fuel cell system according to claim 1, characterized by: the debugging module comprises a JTAG debugging port, and the port is connected to the processor on the controller board of the hydrogen fuel cell system.

5. The controller of a hydrogen fuel cell system according to claim 1, characterized by: the processor is integrated with a 16-bit AD operator, has two channels, each channel is divided into 32 acquisition units, can simultaneously acquire 64 external analog signal inputs, and an operational amplifier circuit can amplify the external 0-20mA standard signal into a voltage signal recognizable by the processor.

6. The controller of a hydrogen fuel cell system according to claim 1, characterized by: the power management module comprises a 24V voltage conversion circuit, a 12V voltage conversion circuit, a 5V voltage conversion circuit and a sampling reference voltage conversion circuit.

7. The controller of a hydrogen fuel cell system according to claim 1, characterized by: the controller further comprises a power safety module configured to stabilize the voltage and current of the power circuit.

8. The controller of a hydrogen fuel cell system according to claim 7, characterized by: The power safety module comprises a TVS tube, an LC filter circuit, a large inductance isolation power ground signal and a large electrolytic capacitor filter circuit.

9. The controller of a hydrogen fuel cell system according to claim 1, characterized by: All modules of the controller are packaged in an aluminum shell, the modules are installed through connectors with an IP67 protection level, and the gaps of the aluminum shell and the gaps between the controller board and the connectors are sealed by means of dispensing.

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