An electric purging control device for a fuel cell bus

Abstract

The present application relates to a kind of electric purging control device for fuel cell bus, connect with fuel cell system, the fuel cell system includes fuel cell system controller, and the purging module is connected with fuel cell system controller and the subsequent control loop of vehicle ON power supply, it is characterized in that, the device includes emergency power-down switch, fuel cell system operation request switch and signal processing module, the input end of fuel cell system operation request switch is connected with fuel cell system controller, the output of fuel cell system controller is connected with the input of signal processing module, the input of emergency power-down switch is connected with signal processing module, the output of signal processing module is connected with the subsequent control loop of vehicle ON power supply in parallel.Compared with prior art, the present application has the advantages of improving safety, reducing vehicle failure rate and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cell system equipment, and in particular to an electric purge control device for a fuel cell bus. Background Art

[0002] Fuel cell buses have become a hot topic in the new energy bus market. By utilizing clean, renewable energy, they offer advantages such as fast energy loading, long driving range, zero pollution, and low cost. However, the development of fuel cells is still in its early stages. Current fuel cell systems require a "purge" after shutdown. This process, known as power-off purge, primarily removes water and hydrogen from the pipelines. This is a necessary procedure after fuel cell shutdown, but currently this operation is largely manual, with limited effectiveness and safety. This process requires specific controls; otherwise, a shutdown could occur due to driver oversight during the power-off process, where the purge is not completed.

[0003] Due to professional habits and other unexpected circumstances, drivers may turn off the key while the fuel cell system is still operating, resulting in a failure to "purge", which can easily lead to serious consequences. Therefore, how to ensure that the fuel cell system does not cause the entire vehicle to lose power due to unexpected circumstances or human oversight while it is operating is an urgent problem to be solved. Summary of the Invention

[0004] The purpose of the present invention is to provide an electric purge control device for a fuel cell bus in order to overcome the above-mentioned defects in the prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] An electric purge control device for a fuel cell bus is connected to a fuel cell system. The fuel cell system includes a fuel cell system controller, a purge module connected to the fuel cell system controller, and a subsequent control circuit for the vehicle's ON-speed power supply. The device includes an emergency power-off switch, a fuel cell system work request switch, and a signal processing module. The fuel cell system work request switch is connected to an input of the fuel cell system controller, an output of the fuel cell system controller is connected to an input of the signal processing module, the emergency power-off switch is connected to an input of the signal processing module, and an output of the signal processing module is connected in parallel to the subsequent control circuit for the vehicle's ON-speed power supply.

[0007] The fuel cell system working request switch provides an enabling signal to the fuel cell system controller, the fuel cell system controller judges whether the fuel cell system needs to work or to be powered off and purged, if powered off and purged, the cleaning module is controlled to be powered off and purged, after the purging is completed, the input to the signal processing module is disconnected, the signal processing module outputs a signal to the power supply at the key source to realize power self-locking, the emergency power-off switch outputs a signal to the signal processing module, the signal processing module is powered off, the whole vehicle ON power supply subsequent control loop in the self-locking state is not controlled by the key, and emergency power-off processing in the failure mode is realized; meanwhile, the signal processing module judges the system state, and disconnects the power output after confirmation.

[0008] Preferably, the signal processing module is connected in parallel with the whole vehicle ON power supply subsequent control loop through a diode, and the whole vehicle ON power supply subsequent control loop is connected with the constant power through the key ON switch.

[0009] Preferably, a relay is arranged between the diode and the constant power, and the relay is controlled by the signal processing module.

[0010] Preferably, the signal processing module is a vehicle-mounted ECU.

[0011] Preferably, the emergency power-off switch is a normally closed one-time switch.

[0012] Preferably, the device further comprises a display screen for displaying the real-time state of the fuel cell control system, and the display screen is connected with the output end of the fuel cell system controller.

[0013] Preferably, the device further comprises an alarm for prompting the driver to perform emergency operation, and the alarm is connected with the output end of the fuel cell system controller.

[0014] Preferably, the alarm is an audible and visual alarm.

[0015] Preferably, the emergency power-off switch is arranged at the driving operation panel of the fuel cell bus, and the fuel cell system working request switch is arranged at the driving operation panel of the fuel cell bus.

[0016] Preferably, the relay is a 24V relay.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] (1) The present application controls the power purge of the fuel cell system, provides an enabling signal to the fuel cell system controller through the fuel cell system working request switch, judges whether the fuel cell system is powered off by the fuel cell system controller, and then controls the cleaning module of the fuel cell system to connect to purge the hydrogen and water in the pipeline, which improves the control efficiency and accuracy compared with the artificial control in the prior art;

[0019] (2) The emergency power-off switch of the application can form self-locking through the power supply provided by the signal processing module. Only after purging is completed, the signal processing module cancels the power output. When the signal processing module is powered on, the subsequent control loop of the vehicle ON power supply is not controlled by the key, which can prevent the misoperation of the driver and improve the safety of the control;

[0020] (3) The application realizes the self-locking of the vehicle power supply through the signal processing module by feeding back the state of the fuel cell system controller, ensures the normal power-off of the fuel cell system, improves the safety of the vehicle, and reduces the failure rate of the vehicle;

[0021] (4) The protection system in the application further comprises a display screen arranged on the driving operation panel and connected with the fuel cell controller, which can display the state of the fuel cell system in real time, and the driver can operate normally according to the state displayed on the display screen;

[0022] (5) The protection system of the application further comprises an alarm connected with the vehicle controller, which adopts an audible and visual alarm to remind the driver to perform emergency power-off processing in a special state, further improving the safety;

[0023] (6) The display screen of the application adopts a liquid crystal display screen with a solar panel as an auxiliary power supply, which is energy-saving and environmentally friendly. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an electric purging control device for a fuel cell bus;

[0025] Figure 2 It is a schematic diagram of the circuit structure of an electric purging control device for a fuel cell bus;

[0026] Figure 3 It is a functional principle diagram of an electric purging control device for a fuel cell bus.

[0027] The symbols in the figure are shown as follows:

[0028] 1, diode, 2, fuel cell system controller, 3, emergency power-off switch, 4, fuel cell system working request switch, 5, signal processing module, 6, display screen, 7, alarm, 8, fuel cell system, 9, driving operation panel, 10, constant power, 11, key ON switch, 12, relay, 13, subsequent control loop of vehicle ON power supply. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example

[0031] The present invention relates to an electric purge control device for fuel cell buses, which is used to prevent safety and quality problems caused by the fuel cell system "purging" hydrogen and water in the pipeline before shutting down. Figure 1 As shown, the device of the present invention includes a fuel cell system controller 2, an emergency power-off switch 3, a fuel cell system operation request switch 4, a signal processing module 5, a display screen 6, and an alarm 7. The signal processing module 5 is a signal recognition and processing circuit having an enable terminal, an input terminal, and an output terminal. The fuel cell system controller 2 has an enable terminal, an input terminal, and an output terminal. The fuel cell system controller 2 is connected to the fuel cell system cleaning module. The fuel cell system operation request switch 4 is a switch located next to the driving operation panel 9. The emergency power-off switch 3 is a one-time switch located next to the driving operation panel 9. The display screen 6 is located on the driving operation panel and connected to the fuel cell system controller 2 to display the real-time system status. The alarm 7 is connected to the fuel cell system controller 2 to prompt the driver to perform emergency operations. Preferably, the display screen 6 uses a liquid crystal display with a solar panel as an auxiliary power source, and the alarm 7 uses an audible and visual alarm. Preferably, the display screen uses a liquid crystal display with a solar panel as an auxiliary power source, which is energy-saving and environmentally friendly.

[0032] like Figure 2 As shown, the output of the fuel cell system controller 2 is connected to the input of the signal processing module 5, and the input of the fuel cell system controller 2 is hard-wired to the fuel cell system operation request switch 4. The fuel cell system operation request switch 4 provides an enable to the fuel cell system controller 2 so that it can determine whether operation or power-off purge is required. The signal processing module 5 is an onboard ECU.

[0033] The emergency power-off switch 3 is connected to the input end of the signal processing module 5 through a relay 12, and the output end of the signal processing module 5 is connected in parallel with the vehicle ON-speed power supply subsequent control circuit 13 of the fuel cell system 8 through a diode 1, which is used to adjust the power distribution of the front end to prevent electric leakage. The vehicle ON-speed power supply subsequent control circuit 13 is connected to the normal power 10 through the key ON-speed switch 11. A relay 12 is provided between the diode 1 and the normal power 10, and the relay 12 is controlled by the signal processing module 5. The emergency power-off switch 3 is a normally closed switch, which is mainly self-locked by the power supply provided by the signal processing module 5. The relay 12 is preferably a 24V relay. The normal power 10 is a line circuit that is not controlled by the key door and is always connected to the positive pole of the battery without interruption of power supply.

[0034] The working principle of the present invention is:

[0035] The fuel cell system operation request switch 4 provides an enable signal to the fuel cell system controller 2. The fuel cell system controller 2 determines whether the fuel cell system 8 requires operation or power-off purging. If power-off purging is required, it controls the purge module to perform the power-off purging. After the purge is complete, the input to the signal processing module 5 is disconnected. The signal processing module 5 outputs a signal through the fuel cell system controller 2, which is fed back to the power supply at the key source via diode 1 to achieve self-locking. In this self-locking state, the vehicle's ON-position power subsequent control circuit 13 is not controlled by the key, preventing driver error. Simultaneously, the signal processing module 5 determines the system status and ensures that the power output is disconnected after completion. The present invention utilizes the status feedback from the fuel cell system controller to achieve vehicle power self-locking using the signal processing module, ensuring that the fuel cell system can be shut down in a standardized manner, improving vehicle safety and reducing vehicle failure rate. The emergency power-off switch 3 outputs a signal to the signal processing module 5, de-energizing it for emergency power-off in failure mode. Simultaneously releasing the power self-lock ensures that, in an emergency, the fuel cell system 8 can be immediately shut down without purging.

[0036] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. An electric purge control device for a fuel cell bus, connected to a fuel cell system (8), wherein the fuel cell system (8) comprises a fuel cell system controller (2), a purge module connected to the fuel cell system controller (2), and a vehicle ON gear power subsequent control circuit (13), characterized in that: The device comprises an emergency power-off switch (3), a fuel cell system work request switch (4) and a signal processing module (5); the fuel cell system work request switch (4) is connected to the input end of the fuel cell system controller (2); the output end of the fuel cell system controller (2) is connected to the input end of the signal processing module (5); the emergency power-off switch (3) is connected to the input end of the signal processing module (5); and the output end of the signal processing module (5) is connected in parallel to a vehicle ON gear power supply subsequent control circuit (13); The fuel cell system operation request switch (4) provides an enable signal to the fuel cell system controller (2), and the fuel cell system controller (2) determines whether the fuel cell system (8) needs to work or power-down purge. If power-down purge is to be performed, the cleaning module is controlled to perform power-down purge. After the purge is completed, the input to the signal processing module (5) is disconnected. The signal processing module (5) outputs a signal to the power supply at the key source to realize power self-locking. The signal processing module (5) determines the system state and disconnects the power output after confirmation. If the emergency power-off switch (3) is pressed during the power-on process, the emergency power-off switch (3) outputs a signal to the signal processing module (5), the signal processing module (5) is powered off, and the vehicle ON gear power subsequent control circuit (13) in the self-locking state is not controlled by the key, thereby realizing emergency power-off processing in the failure mode.

2. The electric purge control device for a fuel cell bus according to claim 1, characterized in that: The signal processing module (5) is connected in parallel with the vehicle ON gear power subsequent control circuit (13) through a diode (1), and the vehicle ON gear power subsequent control circuit (13) is connected to the normal power (10) through a key ON gear switch (11).

3. The electric purge control device for a fuel cell bus according to claim 2, characterized in that: A relay (12) is provided between the diode (1) and the constant current (10), and the relay (12) is controlled by the signal processing module (5).

4. The electric purge control device for a fuel cell bus according to claim 3, characterized in that: The signal processing module (5) is a vehicle-mounted ECU.

5. The electric purge control device for a fuel cell bus according to claim 3, characterized in that: The emergency power-off switch (3) is a normally closed one-time switch.

6. The electric purge control device for a fuel cell bus according to claim 1, characterized in that: The device also includes a display screen (6) for displaying the real-time status of the fuel cell control system. The display screen (6) is connected to the output end of the fuel cell system controller (2).

7. The electric purge control device for a fuel cell bus according to claim 1, characterized in that: The device also includes an alarm (7) for prompting the driver to perform emergency operations. The alarm (7) is connected to the output end of the fuel cell system controller (2).

8. The electric purge control device for a fuel cell bus according to claim 7, characterized in that: The alarm (7) is an audible and visual alarm.

9. The electric purge control device for a fuel cell bus according to claim 5, characterized in that: The emergency power-off switch (3) is arranged on the driving operation panel (9) of the fuel cell bus, and the fuel cell system operation request switch (4) is arranged on the driving operation panel (9) of the fuel cell bus.

10. The electric purge control device for a fuel cell bus according to claim 3, characterized in that: The relay (12) is a 24V relay.

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