A gas replacement device for a hydrogen supply system and a control method thereof

Abstract

The present invention discloses a gas replacement device for a hydrogen supply system, including a hydrogen system controller, a power supply end of the hydrogen system controller connected to a vehicle controller, the vehicle controller being used to power the hydrogen system controller, a control signal output end of the hydrogen system controller being connected to an intake solenoid valve and a bottle valve, a control signal input end of the hydrogen system controller being connected to an external fuel cell controller and a vehicle controller through a CAN interface, and a password gate timing verification module being connected to the hydrogen system controller through a reserved interface, and being used to activate an enable pin according to a momentary switch timing to pass the password gate verification of the hydrogen system controller. The hydrogen system controller will determine whether the activation timing of the enable pin meets the preset password gate timing, and when it is confirmed that the timing meets the requirements, the hydrogen system controller enters a manual replacement state. In the manual replacement state, the operator can continuously activate the enable pin to command the controller to forcibly open all intake solenoid valves and bottle valves for hydrogen replacement.

Description

Technical Field

[0001] The present invention relates to the field of hydrogen storage control, and in particular to a gas replacement device and a control method for a hydrogen supply system. Background Art

[0002] Environmental protection is a hot topic in the world right now. Hydrogen fuel vehicles are slowly becoming an indispensable and important track in my country's new energy vehicles. How to improve the safety and operational convenience of the hydrogen supply system will become a major direction in future technological development.

[0003] At present, during the debugging period of the on-board hydrogen supply system, it is necessary to open the bottle valve to replace the nitrogen in the gas cylinder with hydrogen to meet the working conditions of the hydrogen fuel cell.

[0004] There are three options for hydrogen replacement operations in the industry:

[0005] 1) The gas replacement operation is performed by energizing the electromagnetic coil of the bottle valve. This method requires the bottle valve to be wired and powered. Generally, a set of tooling harnesses is made and connected to all bottle valve ends.

[0006] 2) The operator operates the maintenance valve on the bottle valve to force open the gas line for gas replacement. This method does not require power-on operation, but only some bottle valves in the industry have the maintenance valve function.

[0007] 3) Controlled by the on-board hydrogen supply system controller, a replacement switch is installed near the hydrogen system, the operator presses the replacement switch, and after receiving the signal, the controller controls the bottle valve to be forced to open and perform the replacement operation.

[0008] Since the gas cylinders of the on-board hydrogen supply system are currently arranged at a high position, solutions 1) and 2) are difficult to operate and high-position operations bring potential safety risks. At the same time, the replacement operation requires personnel to operate close to the on-board hydrogen supply system. If abnormal leakage occurs in certain positions of the system during the replacement process, if the on-site operators fail to discover it in time, it may cause certain risks.

[0009] Solution 3) There is no problem with the operation under normal circumstances. However, if non-professionals make mistakes in operation or the vehicle collides abnormally, causing the wiring harness to short-circuit, the replacement will be out of control, posing certain safety risks to the vehicle and the operator.

[0010] How to achieve a replacement method that ensures the safety of the system and personnel, simplifies the operation steps, and improves work efficiency from the perspective of hydrogen supply system design is a major technical challenge that hydrogen supply system suppliers currently need to face. Therefore, it is necessary for us to improve such a structure to overcome the above defects. Summary of the invention

[0011] The purpose of the present invention is to provide a gas replacement device and control method for a hydrogen supply system, aiming to simplify the operation of operators and improve the work efficiency of replacement under the premise of improving operational safety.

[0012] The above technical objectives of the present invention are achieved through the following technical solutions:

[0013] A hydrogen supply system gas replacement device, comprising a hydrogen system controller, a power supply end of the hydrogen system controller is connected to a vehicle controller, the vehicle controller is used to power the hydrogen system controller, a control signal output end of the hydrogen system controller is connected to an intake solenoid valve and a bottle valve, and a control signal input end of the hydrogen system controller is communicatively connected to an external fuel cell controller and a vehicle controller via a CAN interface;

[0014] It also includes a password gate timing verification module, which is connected to the hydrogen system controller through a reserved interface and is used to activate the enable pin according to the inching switch timing to pass the password gate verification of the hydrogen system controller.

[0015] Furthermore, the password gate timing verification module is an audible and visual alarm for on-site manual verification. The audible and visual alarm prompts the inching switch timing through audible and visual feedback signals. The operator controls the disconnection and conduction of the enable pin according to the audible and visual feedback signals to pass the password gate verification of the hydrogen system controller.

[0016] Furthermore, the password gate timing verification module is a remote Bluetooth control device for remote automatic verification. The remote Bluetooth control device is used to receive the inching switch timing sent by the remote control terminal, and use the inching switch timing to control the disconnection and conduction of the enable pin to pass the password gate verification of the hydrogen system controller.

[0017] Furthermore, the remote Bluetooth control device includes a shell, a battery is installed in the shell through a battery rack, a Bluetooth communication module is provided on the side of the battery, and a relay is provided at the control end of the Bluetooth communication module. The relay is electrically connected to the hydrogen system controller through an explosion-proof flange interface arranged on the outer surface of the shell, and controls the disconnection and conduction of the enable pin of the hydrogen system controller.

[0018] A method for controlling a gas replacement device of a hydrogen supply system comprises the following steps:

[0019] When awakened normally, the hydrogen system controller enters the automatic mode by default after self-checking, and drives and controls the intake solenoid valve and bottle valve according to the message instructions and fault status sent by the external fuel cell controller and vehicle controller;

[0020] When receiving a replacement hardline enable or replacement message, the hydrogen system controller enters the replacement mode. The workflow of the replacement mode is as follows:

[0021] S101, manually access the sound and light alarm and the remote Bluetooth control device, and control the disconnection and conduction of the enable pin through on-site manual verification or remote automatic verification mode to pass the password door verification of the hydrogen system controller;

[0022] S102, the hydrogen system controller confirms whether the disconnection and conduction timing of the enable pin meets the requirements. If it does, it passes; otherwise, it fails.

[0023] S103, when the hydrogen system controller confirms that the requirements are met, it enters the manual replacement state, and the low-frequency driven sound and light alarm issues a manual replacement state prompt, while warning nearby non-operating personnel to keep a safe distance; after the operator confirms that the hydrogen system controller has entered the manual replacement state, he opens the air intake solenoid valve and the bottle valve to start the replacement operation;

[0024] S104, when the replacement is completed, the hydrogen system controller closes the air intake solenoid valve and the bottle valve, the on-site personnel disconnect the sound and light alarm and the remote Bluetooth control device, the hydrogen system controller exits the manual replacement state and returns to the automatic mode, and at the same time stops the sound and light alarm and stops issuing manual replacement state prompts.

[0025] Furthermore, the method of the on-site manual verification mode is as follows:

[0026] The hydrogen system controller controls the sound and light alarm to prompt the inching switch timing through the sound and light feedback signal. The operator controls the disconnection and conduction of the enable pin according to the sound and light feedback signal to pass the password door verification of the hydrogen system controller.

[0027] Furthermore, the method of the remote automatic verification mode is as follows:

[0028] The remote control terminal sends the inching switch timing to the remote Bluetooth control device, which receives the inching switch timing through the Bluetooth communication module and controls the disconnection and conduction of the enable pin through the relay to pass the password door verification of the hydrogen system controller.

[0029] Furthermore, the process of password door verification is as follows:

[0030] The password gate is divided into two rounds of judgment. Define the counting variable N, and the initial value of N is 0;

[0031] When the hydrogen system controller detects that the enable pin is connected to the ground wire, it is determined to be in a valid state, which is defined as S=1; when the hydrogen system controller detects that the bottle valve replacement enable pin is suspended, that is, not connected to the ground wire, it is determined to be in an invalid state, which is defined as S=0;

[0032] The sound and light alarm is in the non-actuated state by default;

[0033] L101, the operator performs a short-circuit operation when the hydrogen system controller is in normal operation; at this time, the hydrogen system controller confirms that S=1 in the automatic mode and enters the password door verification process of the replacement mode;

[0034] L102, when the S=1 state is maintained, the hydrogen system controller continues to drive the sound and light alarm; if the S=0 state appears for more than 0.5s in the middle, the hydrogen system controller stops driving the sound and light alarm, exits the current verification process, returns to the beginning of the process L101, and the N count is reset;

[0035] When the S=1 state is maintained for a rated time T (N+1), the hydrogen system controller drives the sound and light alarm at a high frequency. At this time, the on-site operator can observe the fast flashing light as a prompt and perform the disconnection operation. The hydrogen system controller begins to determine the S=0 state;

[0036] L103, if the S=1 state appears for more than 0.5s in the middle, the hydrogen system controller stops driving the sound and light alarm, exits the current verification process, returns to the beginning of the process L101, and the N count is reset;

[0037] When the S=0 state is maintained for the rated time T (N+2), the counting variable N is incremented by 1;

[0038] L104, determine whether N is equal to 2 at this time. If N is not equal to 2, the process returns to the top of L102, and the hydrogen system controller switches to continuously drive the sound and light alarm again. At this time, it can be observed that the light switches from fast flashing to continuous high brightness. This is used as a prompt to perform a short-circuit operation and enter the second round of password door verification;

[0039] Similarly, after completing the second round of password door verification according to the above process, L104 determines that N is equal to 2. At this time, the hydrogen system controller drives the sound and light alarm at a low frequency to prompt personnel to perform replacement.

[0040] In summary, the present invention has the following beneficial effects:

[0041] It effectively avoids the situation where people accidentally open the bottle valve, and avoids the situation where the bottle valve is accidentally opened due to a short circuit in the line caused by a vehicle collision. At the same time, the convenience of operation is guaranteed through wireless Bluetooth transmission and mobile phone operation. This invention scheme improves the convenience of maintenance while ensuring the safety of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is the electrical schematic diagram of the hydrogen system controller described in the present invention.

[0043] Figure 2 It is a control flow chart of the hydrogen system described in the present invention.

[0044] Figure 3It is a flow chart of the manual replacement operation described in the present invention.

[0045] Figure 4 It is the logic flow chart of the password door described in the present invention.

[0046] Figure 5 It is a principle diagram of the remote Bluetooth control device described in the present invention.

[0047] Figure 6 It is a structural diagram of the remote Bluetooth control device described in the present invention. DETAILED DESCRIPTION

[0048] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with illustrations and specific embodiments.

[0049] like Figures 1 to 6 As shown, a hydrogen supply system gas replacement device proposed in the present invention comprises a hydrogen system controller (200), a power supply end of the hydrogen system controller (200) is connected to a vehicle controller, the vehicle controller is used to supply power to the hydrogen system controller (200), a control signal output end of the hydrogen system controller (200) is connected to an intake solenoid valve (209) and bottle valves (201 to 208), and a control signal input end of the hydrogen system controller (200) is communicatively connected to an external fuel cell controller and a vehicle controller via a CAN interface;

[0050] The present invention also includes a password gate timing verification module, which is connected to the hydrogen system controller (200) through a reserved interface and is used to activate the enable pin according to the inching switch timing to pass the password gate verification of the hydrogen system controller (200).

[0051] The password gate timing verification module is an audible and visual alarm (302) for on-site manual verification. The audible and visual alarm (302) prompts the inching switch timing through an audible and visual feedback signal. The operator controls the disconnection and conduction of the enable pin according to the audible and visual feedback signal to pass the password gate verification of the hydrogen system controller (200).

[0052] The password gate timing verification module may also be a remote Bluetooth control device (303) for remote automatic verification. The remote Bluetooth control device (303) is used to receive the inching switch timing sent by the remote control terminal, and control the disconnection and conduction of the enable pin with the inching switch timing to pass the password gate verification of the hydrogen system controller (200).

[0053] The remote Bluetooth control device (303) comprises a housing (3031), a battery (3032) is installed in the housing (3031) via a battery rack (3033), a Bluetooth communication module (3034) is arranged on the side of the battery (3032), a relay (3035) is arranged at the control end of the Bluetooth communication module (3034), and the relay (3035) is electrically connected to the hydrogen system controller (200) via an explosion-proof flange interface (3036) arranged on the outer surface of the housing (3031), and controls the disconnection and conduction of the enable pin of the hydrogen system controller (200).

[0054] The hydrogen system controller (200) first determines whether the activation timing of the enable pin meets the preset password gate timing. When it is confirmed that the timing meets the requirements, the hydrogen system controller (200) enters the manual replacement state. In the manual replacement state, the operator can continuously activate the enable pin to command the controller to force open all the air intake solenoid valves (209) and bottle valves (201 to 208) to perform hydrogen replacement. Example

[0055] A gas replacement device and control method for a hydrogen supply system Figure 1 As shown, the hydrogen system controller (hereinafter referred to as HMS) is connected to the bottle valves 201-208 and the intake solenoid valve 209 (referred to as the main valve in the figure), and is controlled by the vehicle controller (hereinafter referred to as VCU) to provide power and wake-up electricity. When the power supply and voltage are normal, when the wake-up voltage is adjusted from 0V to 24V, the HMS is awakened from the dormant state and communicates with the external fuel cell controller (hereinafter referred to as FCU) and the vehicle controller (hereinafter referred to as VCU) through the CAN interface (hereinafter referred to as CANA), and opens and closes the bottle valves 201-208 and the intake solenoid valve 209 according to the instructions of the external controller. At the same time, the bottle valve is integrated with a temperature sensor, which can convert the temperature change of the gas in the gas cylinder into a voltage signal and upload it to the HMS through the line to realize the monitoring of the temperature status of each gas cylinder.

[0056] The working flow diagram of the hydrogen supply system is as follows: Figure 2 As shown, the HMS is awakened and enters the automatic mode by default after self-checking, and drives and controls the bottle valve according to the received message instructions and fault status; it enters the replacement mode when receiving the replacement hard line enable or replacement message.

[0057] The hydrogen system has reserved an audible and visual alarm interface, a diagnostic screen intranet interface, and a remote Bluetooth control device interface on the wiring harness. On-site operators can use these three interfaces to complete the replacement work.

[0058] The operation process of the hydrogen replacement function involved in this patent is as follows Figure 3 shown.

[0059] The operator will Figure 1 The sound and light alarm 302 is connected to the reserved interface of the wiring harness, the remote Bluetooth control device 303 is connected to the reserved interface of the wiring harness, and the HMS receives relevant signal input.

[0060] S101, when the HMS is awakened normally, after the HMS receives the grounding of the bottle valve replacement enable pin, it drives the sound and light alarm to prompt the operator to disconnect and short-circuit the bottle valve replacement enable pin and the ground wire at different intervals to ensure that the timing of the hard line enable meets the preset requirements, that is, Figure 2 "Verify through the password door" in.

[0061] S102, confirm through the password gate verification process whether the on and off timing between the bottle valve replacement enable pin and the ground wire meets the requirements, if it does, it passes, otherwise it fails.

[0062] S103, when HMS confirms that the hard line enable timing meets the requirements, it enters Figure 2 The operator will enter the "manual replacement state" in the HMS, and drive the sound and light alarm at a low frequency as a reminder of entering the "manual replacement state", and warn nearby non-operating personnel to keep a safe distance. After the operator confirms that the HMS has entered the manual replacement state, short-circuit the bottle valve replacement enable pin and the ground wire to force the HMS to open all bottle valves and the main valve.

[0063] S104, when the replacement is completed, disconnect the remote Bluetooth control device, and HMS will close all bottle valves and the main valve. After the disconnection lasts for more than the set time, HMS exits the manual replacement state and returns to the automatic mode, and at the same time stops enabling the sound and light alarm as a reminder to exit the manual replacement state.

[0064] The logic flow chart of the password gate determination involved in this patent is as follows Figure 4 shown.

[0065] The password door is divided into two rounds of judgment, corresponding to Figure 3 In step S102, a counting variable N is defined, and the initial value of N is 0.

[0066] When HMS detects that the bottle valve replacement enable pin is connected to the ground wire and is determined to be in a valid state (hereinafter referred to as "shorting the bottle valve replacement enable pin and the ground wire" as "shorting operation"), it is defined as S=1;

[0067] When HMS detects that the bottle valve replacement enable pin is suspended, that is, not connected to the ground wire, it is determined to be in an invalid state (hereinafter referred to as "disconnecting the bottle valve replacement enable pin from the ground wire" as "disconnection operation") and is defined as S=0;

[0068] The sound and light alarm is initially in the non-actuated state by default.

[0069] L101, the operator performs a short-circuit operation when the HMS is in normal operation. Figure 2 When S=1 is confirmed in the automatic mode shown, the password door verification process of the maintenance mode is entered.

[0070] L102, when the S=1 state is maintained, HMS continues to drive the sound and light alarm; if the S=0 state appears for more than 0.5s in the middle, HMS stops driving the sound and light alarm, exits the current verification process, returns to the beginning of the process L101, and the N count is reset.

[0071] When the S=1 state is maintained for the rated time T(N+1), the HMS drives the sound and light alarm at a high frequency. At this time, the on-site operator can observe the fast flashing light as a prompt and perform the disconnection operation. The HMS begins to determine the S=0 state.

[0072] L103, if the S=1 state appears for more than 0.5s in the middle, HMS stops driving the sound and light alarm, exits the current verification process, returns to the beginning of the process L101, and the N count is reset.

[0073] When the S=0 state is maintained for the rated time T (N+2), the counting variable N is accumulated by 1.

[0074] L104, determine whether N is equal to 2 at this time. If N is not equal to 2, the process returns to the top of L102, and HMS switches to continuously driving the sound and light alarm again. At this time, it can be observed that the light switches from fast flashing to continuous high brightness. This is used as a prompt to perform a short-circuit operation and enter the second round of password door verification.

[0075] Similarly, after completing the second round of password door verification according to the above process, L104 determines that N is equal to 2. At this time, HMS drives the sound and light alarm at a low frequency to prompt personnel to replace. Figure 3 Step S103 in .

[0076] In the above process, the remote Bluetooth control device 303 is connected to the reserved plug-in on the wiring harness, and the remote Bluetooth control device is remotely controlled by a mobile phone to realize password door verification.

[0077] The principle and structure of the remote Bluetooth control device are as follows Figure 5 and Figure 6 shown.

[0078] A lithium battery is used as the energy supply unit for the Bluetooth receiving module and relay, and a charging control board is connected in parallel as a charging unit. The charging controller can receive power input through an external Type C interface to charge the lithium battery.

[0079] The on-site operator connects the remote Bluetooth control device to the manual replacement port reserved in the wiring harness, and turns the external paddle switch to activate the Bluetooth module inside the device. The module continuously emits Bluetooth adapter signals when working.

[0080] After the operator has connected the mobile phone to the Bluetooth adapter, he can use the smartphone APP software (such as Figure 5 The Bluetooth module sends commands to the Bluetooth module in the preset T(N+1)T(N+2) sequence that satisfies the password door verification. The Bluetooth module opens and closes the built-in switch according to the command, and then drives the relay coil to achieve the relay closure and disconnection according to the command sequence, completing the setting of the replacement mode.

[0081] The advantages of remote Bluetooth control devices are

[0082] (1) The timing of the remote Bluetooth control device can be preset through the smartphone APP, which greatly simplifies the operator's operation and improves work efficiency.

[0083] (2) Since hydrogen and air are flammable when their concentration reaches a certain ratio after mixing, operators usually discharge the replaced hydrogen into the air in an open area. If the personnel are close to the discharge port during the discharge (for example, the hydrogen supply system is installed on the roof and the replacement requires personnel to stay on the roof for a long time to complete), there will be certain safety hazards. At the same time, the gas flow rate is high and the noise is high during the discharge, which causes certain obstacles to the on-site language communication of personnel, further increasing the safety risks of on-site operations. The use of wireless Bluetooth control can allow personnel to perform remote operations while maintaining a certain safe distance from the hydrogen supply system discharge port, reducing the time personnel need to stay at the work site, avoiding safety risks, and ensuring that the normal language communication of personnel on-site operations is not hindered by noise.

[0084] In this document, the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", and "horizontal" are based on the directions or positional relationships shown in the accompanying drawings and are only for the clarity of expressing the technical solutions and the convenience of description, and therefore should not be understood as limitations of the present invention.

[0085] In this document, the terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than those listed and may also include additional elements not expressly listed.

[0086] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A hydrogen supply system gas replacement device, comprising a hydrogen system controller (200), a power supply end of the hydrogen system controller (200) being connected to a vehicle controller, the vehicle controller being used to supply power to the hydrogen system controller (200), a control signal output end of the hydrogen system controller (200) being communicatively connected to an intake solenoid valve (209) and bottle valves (201, 202, 203, 204, 205, 206, 207, 208), and a control signal input end of the hydrogen system controller (200) being communicatively connected to an external fuel cell controller and a vehicle controller via a CAN interface; It is characterized in that It also includes a password gate timing verification module, which is connected to the hydrogen system controller (200) through a reserved interface and is used to activate the enable pin according to the inching switch timing to pass the password gate verification of the hydrogen system controller (200); The password gate timing verification module is an acoustic and visual alarm (302) for on-site manual verification. The acoustic and visual alarm (302) prompts the inching switch timing through an acoustic and visual feedback signal. The operator controls the disconnection and conduction of the enable pin according to the acoustic and visual feedback signal to pass the password gate verification of the hydrogen system controller (200); The password gate timing verification module is a remote Bluetooth control device (303) used for remote automatic verification. The remote Bluetooth control device (303) is used to receive the inching switch timing sent by the remote control terminal, and control the disconnection and conduction of the enable pin with the inching switch timing to pass the password gate verification of the hydrogen system controller (200).

2. The gas replacement device for the hydrogen supply system according to claim 1, characterized in that: The remote Bluetooth control device (303) comprises a housing (3031), a battery (3032) is installed in the housing (3031) via a battery rack (3033), a Bluetooth communication module (3034) is arranged on the side of the battery (3032), a relay (3035) is arranged at the control end of the Bluetooth communication module (3034), and the relay (3035) is electrically connected to the hydrogen system controller (200) via an explosion-proof flange interface (3036) arranged on the outer surface of the housing (3031), and controls the disconnection and conduction of the enable pin of the hydrogen system controller (200).

3. A control method for a gas replacement device of a hydrogen supply system, characterized in that: The steps include: In the normally awakened state, the hydrogen system controller (200) enters the automatic mode by default after self-checking, and drives and controls the intake solenoid valve (209) and the bottle valves (201, 202, 203, 204, 205, 206, 207, 208) according to the message instructions and fault status sent by the external fuel cell controller and the vehicle controller; When receiving a replacement hard line enable or replacement message, the hydrogen system controller (200) enters a replacement mode. The workflow of the replacement mode is as follows: S101, manually accessing the sound and light alarm (302) and the remote Bluetooth control device (303), controlling the disconnection and conduction of the enable pin through on-site manual verification or remote automatic verification mode, so as to pass the password door verification of the hydrogen system controller (200); S102, the hydrogen system controller (200) confirms whether the disconnection and conduction timing of the enable pin meets the requirements, if it meets the requirements, it passes, otherwise it fails; S103, when the hydrogen system controller (200) confirms that the requirements are met, it enters the manual replacement state, and the low-frequency driven sound and light alarm (302) issues a manual replacement state prompt, and warns nearby non-operating personnel to keep a safe distance; after the operator confirms that the hydrogen system controller (200) has entered the manual replacement state, the operator opens the air intake solenoid valve (209) and the bottle valves (201, 202, 203, 204, 205, 206, 207, 208) to start the replacement operation; S104, when the replacement is completed, the hydrogen system controller (200) closes the air intake solenoid valve (209) and the bottle valves (201, 202, 203, 204, 205, 206, 207, 208), the on-site personnel disconnect the sound and light alarm (302) and the remote Bluetooth control device (303), the hydrogen system controller (200) exits the manual replacement state and returns to the automatic mode, and at the same time stops the sound and light alarm (302) and stops issuing the manual replacement state prompt.

4. The control method of the gas replacement device of the hydrogen supply system according to claim 3, characterized in that: The method of the on-site manual verification mode is as follows: The hydrogen system controller (200) controls the sound and light alarm (302) to prompt the inching switch timing through the sound and light feedback signal, and the operator controls the disconnection and conduction of the enable pin according to the sound and light feedback signal to pass the password door verification of the hydrogen system controller (200).

5. The control method of the gas replacement device of the hydrogen supply system according to claim 3, characterized in that: The method of the remote automatic verification mode is as follows: The remote control terminal sends the inching switch timing to the remote Bluetooth control device (303), and the Bluetooth control device (303) receives the inching switch timing through the Bluetooth communication module (3034), and controls the disconnection and conduction of the enable pin through the relay (3035) to pass the password door verification of the hydrogen system controller (200).

6. The control method of the gas replacement device of the hydrogen supply system according to claim 3, characterized in that: The process of password door verification is as follows: The password gate is divided into two rounds of judgment. Define the counting variable N, and the initial value of N is 0; When the hydrogen system controller (200) detects that the enable pin is connected to the ground wire, it is determined to be in a valid state, which is defined as S=1; when the hydrogen system controller (200) detects that the bottle valve replacement enable pin is suspended, that is, not connected to the ground wire, it is determined to be in an invalid state, which is defined as S=0; The sound and light alarm (302) is initially in a non-actuated state by default; L101, the operator performs a short-circuit operation when the hydrogen system controller (200) is in normal operation; at this time, the hydrogen system controller (200) confirms that S=1 in the automatic mode and enters the password door verification process of the replacement mode; L102, when the S=1 state is maintained, the hydrogen system controller (200) continuously drives the sound and light alarm (302); if the S=0 state appears for more than 0.5s in the middle, the hydrogen system controller (200) stops driving the sound and light alarm (302), exits the current verification process, returns to the beginning of the process L101, and the N count is reset; When the S=1 state is maintained for a rated time T(N+1), the hydrogen system controller (200) drives the sound and light alarm (302) at a high frequency. At this time, the on-site operator can observe the fast flashing light as a prompt and perform the disconnection operation. The hydrogen system controller (200) starts to determine the S=0 state; L103, if the S=1 state appears for more than 0.5s in the middle, the hydrogen system controller (200) stops driving the sound and light alarm (302), exits the current verification process, returns to the beginning of the process L101, and the N count is reset; When the S=0 state is maintained for the rated time T (N+2), the counting variable N is incremented by 1; L104, determine whether N is equal to 2 at this time. If N is not equal to 2, the process returns to the top of L102, and the hydrogen system controller (200) switches to continuously drive the sound and light alarm (302) again. At this time, it can be observed that the light switches from fast flashing to continuous high brightness. This is used as a prompt to perform a short-circuit operation and enter the second round of password door verification; Similarly, after completing the second round of password door verification according to the above process, L104 determines that N is equal to 2. At this time, the hydrogen system controller (200) drives the sound and light alarm (302) at a low frequency to prompt the personnel to perform replacement.

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