A method and system for noise control of fuel cell bus vehicle station stops

Abstract

This invention discloses a noise control method and system for fuel cell buses stopping at bus stops, relating to the field of fuel cell vehicle technology. The method includes: acquiring the distance between the vehicle's current position and the bus stop, and the current vehicle speed; when the distance is less than or equal to a set distance threshold and the vehicle speed is less than or equal to a set speed threshold, controlling the reduction of the fuel cell engine's output power, and acquiring the duty cycle of each fan in the fuel cell radiator; when the duty cycle of any fan is greater than a set proportional threshold, controlling the reduction of the fan duty cycle, disconnecting the connection between the fuel cell and the fuel cell radiator, and opening the connection between the fuel cell and the heat exchanger to reduce the temperature of the fuel cell coolant in the heat exchanger, thereby achieving short-term auxiliary cooling of the fuel cell, solving the problem of insufficient cooling of the fuel cell coolant, and balancing noise control and system thermal safety.

Description

Technical Field

[0001] This invention relates to the field of fuel cell vehicle technology, and in particular to a method and system for noise control when a fuel cell bus stops at a station. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] During operation, fuel cell buses need to frequently start and stop at stations along the route. Passengers waiting for the bus and people getting on and off the bus will gather around the vehicle. The noise generated during the operation and stopping of the vehicle will directly affect the comfort of the sound environment around the station and reduce the passenger waiting and travel experience.

[0004] At present, the main noise source of fuel cell buses is the cooling fan of the fuel cell system: on the one hand, due to the limited space layout of the vehicle, the cooling fan is located close to the outside of the vehicle or the passenger activity area, and the noise of the fan itself can be directly transmitted to the surrounding people; on the other hand, when the fuel cell is under high load, the cooling fan needs to run at high speed and large duty cycle, which significantly increases the noise intensity and causes obvious noise interference to people waiting at the platform and getting off the bus. The scope and degree of interference are quite prominent.

[0005] Among existing optimization technologies for fuel cell heat dissipation noise, some studies have focused on reducing noise by controlling the operating sequence of cooling fans. This approach, through adjusting the fan start-up, stop, and rotation logic, can reduce continuous high noise output to some extent, but it is only applicable to the low-power operating range of the fuel cell. When the vehicle is under high-load conditions such as climbing, acceleration, or full load, and the fuel cell enters the high-power range, the cooling fans must operate continuously at high load to meet heat dissipation requirements. In such cases, this control strategy cannot effectively reduce noise, limiting its applicability.

[0006] Other studies have explored noise reduction through optimizing radiator layout, but the overall layout of buses must prioritize ensuring smooth airflow to and from the cooling system, a reasonable center of gravity, and compact installation space. Due to constraints such as vehicle structure, chassis space, and air duct layout, optimizing radiator layout is difficult to apply directly to fuel cell buses.

[0007] Furthermore, there is a strong contradiction between heat dissipation and the safe operation of fuel cells: simply reducing the speed of the cooling fan to reduce noise will lead to insufficient heat dissipation capacity of the fuel cell coolant, resulting in a significant decrease in heat dissipation efficiency. Buses are characterized by short stop times at bus stops and frequent fluctuations in operating conditions. If the heat dissipation rate is too slow during these short stops, the fuel cell temperature is highly likely to overheat, trigger over-temperature alarms, or even shut down, seriously affecting the reliability of the fuel cell system and driving safety.

[0008] In summary, existing technologies cannot achieve a balance between noise reduction under high power conditions, vehicle space adaptation, efficient heat dissipation in short time, and safe operation of fuel cells, making it difficult to simultaneously meet the noise control and thermal management requirements of fuel cell buses. Summary of the Invention

[0009] To address the aforementioned issues, this invention proposes a noise control method and system for fuel cell buses stopping at bus stops. By reducing the speed of the radiator fan to reduce noise, the method also controls and reduces the output power of the fuel cell engine, and utilizes the air conditioning system and heat exchanger to provide short-term auxiliary cooling for the fuel cell, thus solving the problem of insufficient cooling of the fuel cell coolant and balancing noise control with system thermal safety.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a noise control method for fuel cell buses stopping at bus stops, comprising: Obtain the distance between the vehicle's current location and the platform, as well as the vehicle's current speed; When the distance is less than or equal to a set distance threshold and the vehicle speed is less than or equal to a set vehicle speed threshold, the output power of the fuel cell engine is reduced, and the duty cycle of each fan of the current fuel cell radiator is obtained. When the fan duty cycle exceeds a set threshold, the fan duty cycle is reduced, the connection between the fuel cell and the fuel cell radiator is disconnected, and the connection between the fuel cell and the heat exchanger is opened to reduce the temperature of the fuel cell coolant in the heat exchanger.

[0011] As an alternative implementation, when the distance is less than or equal to a set distance threshold and the vehicle speed is less than or equal to a set vehicle speed threshold, the output power of the fuel cell engine is controlled to be reduced to idle power.

[0012] As an alternative implementation, when the duty cycle of each fan is less than or equal to a set proportional threshold, the fuel cell and the heat exchanger are kept in a shut-off state, and the radiator operates normally as required.

[0013] As an alternative implementation, when the duty cycle of a fan is greater than a set percentage threshold, the fan is controlled to decrease to the set percentage threshold.

[0014] As an alternative implementation, the set ratio threshold is 30%.

[0015] As an alternative implementation, after the connection between the fuel cell and the heat exchanger is opened, the fuel cell coolant flows through the heat exchanger. Inside the heat exchanger, the temperature of the fuel cell coolant is reduced by the cooling water of the air conditioning system. After being cooled by the heat exchanger, the fuel cell coolant flows back to the fuel cell engine through the fuel cell radiator.

[0016] Secondly, the present invention provides a noise control system for fuel cell buses stopping at bus stops, comprising: The vehicle controller is configured to obtain the distance between the vehicle's current position and the platform, as well as the current vehicle speed. When it is determined that the distance is less than or equal to a set distance threshold and the vehicle speed is less than or equal to a set vehicle speed threshold, it sends a control command to the fuel cell controller. The fuel cell controller is configured to reduce the output power of the fuel cell engine according to the received control command and obtain the duty cycle of each fan of the current fuel cell radiator. When the duty cycle of a fan is greater than a set proportional threshold, the fuel cell radiator controller controls the fan duty cycle to be reduced, and at the same time controls the disconnection between the fuel cell and the fuel cell radiator and the opening of the connection between the fuel cell and the heat exchanger to reduce the temperature of the fuel cell coolant in the heat exchanger.

[0017] As an alternative implementation, the fuel cell controller is integrated into the fuel cell engine, the fuel cell radiator controller is integrated into the fuel cell radiator, and the fuel cell engine, fuel cell radiator and heat exchanger are connected through a three-way valve; the fuel cell controller is connected to the three-way valve, and by controlling the three-way valve, the opening and closing of the fuel cell and the fuel cell and the heat exchanger can be realized.

[0018] As an alternative implementation, after the connection between the fuel cell and the heat exchanger is opened, the fuel cell coolant flows through the heat exchanger. Inside the heat exchanger, the temperature of the fuel cell coolant is reduced by the cooling water of the air conditioning system. After being cooled by the heat exchanger, the fuel cell coolant flows back to the fuel cell engine through the fuel cell radiator.

[0019] Thirdly, the present invention provides a fuel cell vehicle including the noise control system described in the second aspect for controlling the noise of the fuel cell bus stopping at a station.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) Effectively reduce vehicle noise and improve the comfort of the surrounding sound environment and user experience.

[0021] By accurately identifying the distance between the vehicle and the platform and the current vehicle speed, noise reduction control is only activated when the vehicle is close to the platform and traveling at a low speed, avoiding unnecessary power adjustments that could disrupt normal vehicle operation. By controlling the fuel cell engine's output power to reduce idle speed, the load on the cooling system is reduced at the source. Simultaneously, for cooling fans with excessive duty cycles, their duty cycles are lowered, directly weakening the noise output intensity of the main noise sources and overcoming the limitation of existing technologies in reducing noise at high power levels. This noise reduction significantly improves the auditory experience for passengers waiting at the platform and those boarding or alighting, reducing noise interference and enhancing the comfort and satisfaction of public transportation travel.

[0022] (2) Solve the coupling contradiction between heat dissipation and noise reduction, and ensure the safe and stable operation of the fuel cell system.

[0023] To address the issue that simply reducing fan speed can lead to insufficient coolant dissipation and fuel cell overheating, this invention reduces the fan duty cycle, disconnects the fuel cell from the radiator, and simultaneously connects the fuel cell to the heat exchanger. The heat exchanger efficiently cools the fuel cell coolant, achieving a balance between noise reduction and heat dissipation. This design is precisely suited to the short stopping times of buses, ensuring rapid coolant cooling even during short stops, despite the fan operating at a low duty cycle. This effectively prevents risks such as overheating alarms and shutdowns due to slow heat dissipation, significantly improving the reliability, stability, and lifespan of the fuel cell system and ensuring driving safety.

[0024] (3) It is suitable for the space constraints of public transport vehicles and has engineering feasibility and mass implementation value.

[0025] This invention does not require altering the original layout of the fuel cell radiator and heat exchanger. It achieves coordinated control of noise reduction and heat dissipation simply through optimized control logic and switching of pipeline connectivity. This avoids the problem in existing technologies where noise reduction through optimized radiator layout is limited by insufficient space in buses. It requires no additional large equipment or significant modifications to the overall vehicle layout, adapting to the compact space requirements of buses. The modification is simple and cost-effective, and can be directly applied to the upgrade and retrofit of existing fuel cell buses, demonstrating engineering practicality and value for mass production.

[0026] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 This is an architecture diagram of a noise control system for fuel cell buses stopping at bus stops provided by the present invention. Figure 2 A flowchart of the noise control method for fuel cell bus stops at bus stops provided by the present invention; The components include: 1. GPS system; 2. Speed ​​sensor; 3. Vehicle controller; 4. Fuel cell controller; 5. Fuel cell engine; 6. Fuel cell radiator controller; 7. Fuel cell radiator; 8. Three-way valve; 9. Heat exchanger; and 10. Air conditioning system. Detailed Implementation

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

[0030] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0031] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. Furthermore, it should be understood that the terms “comprising” and “including”, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0032] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0033] During operation, fuel cell buses need to frequently start and stop at stations along the route. Passengers waiting for the bus and people getting on and off the bus will gather around the vehicle. The noise generated during the operation and stopping of the vehicle will directly affect the comfort of the sound environment around the station and reduce the passenger waiting and travel experience.

[0034] At present, the main noise source of fuel cell buses is the cooling fan of the fuel cell system: on the one hand, due to the limited space layout of the vehicle, the cooling fan is located close to the outside of the vehicle or the passenger activity area, and the noise of the fan itself can be directly transmitted to the surrounding people; on the other hand, when the fuel cell is under high load, the cooling fan needs to run at high speed and large duty cycle, which significantly increases the noise intensity and causes obvious noise interference to people waiting at the platform and getting off the bus. The scope and degree of interference are quite prominent.

[0035] When fuel cell buses stop at stations, to reduce the impact of radiator noise on passengers, a quieter radiator can be used. However, there are currently no mature technologies or products on the market to replace the existing fuel cell cooling solutions for vehicles, so this is not feasible for the time being. Alternatively, the radiator can be placed away from passengers, but this requires better vehicle layout space. Currently, for buses, especially double-decker buses, it is more reasonable to place the radiator on the rear sides of the vehicle.

[0036] This invention uses a method of reducing the speed of the radiator fan to reduce noise. However, the reduced speed of the radiator fan will lead to insufficient heat dissipation capacity of the fuel cell coolant, resulting in a significant decrease in heat dissipation efficiency. This can easily lead to excessively high fuel cell temperature, over-temperature alarms, or even shutdown risks, seriously affecting the reliability of the fuel cell system and driving safety.

[0037] Therefore, this invention, based on reducing noise by lowering the radiator fan speed, achieves short-term auxiliary cooling of the fuel cell by controlling and reducing the output power of the fuel cell engine, and by utilizing the air conditioning system and heat exchanger, thus solving the problem of fuel cell coolant cooling under low duty cycle of the fuel cell radiator fan, thereby reducing the noise emitted by the vehicle after entering the bus stop.

[0038] Therefore, a noise control method for fuel cell buses stopping at bus stops is provided to reduce the noise generated when the vehicle enters the bus stop and improve the comfort of passengers waiting at the bus stop and passengers getting off the vehicle.

[0039] Mainly includes: Obtain the distance between the vehicle's current location and the platform, as well as the vehicle's current speed; When the distance is less than or equal to a set distance threshold and the vehicle speed is less than or equal to a set vehicle speed threshold, the output power of the fuel cell engine is reduced, and the duty cycle of each fan of the current fuel cell radiator is obtained. When the fan duty cycle exceeds a set threshold, the fan duty cycle is reduced, the connection between the fuel cell and the fuel cell radiator is disconnected, and the connection between the fuel cell and the heat exchanger is opened to reduce the temperature of the fuel cell coolant in the heat exchanger.

[0040] The above method is applied to, for example Figure 1 The noise control system for a fuel cell bus parked at a station is shown. It includes: a vehicle controller 3, a fuel cell controller 4, a fuel cell engine 5, a fuel cell radiator controller 6, a fuel cell radiator 7, a heat exchanger 9, and an air conditioning system 10.

[0041] The fuel cell controller 4 is integrated into the fuel cell engine 5, the fuel cell radiator controller 6 is integrated into the fuel cell radiator 7, the vehicle controller 3 and the fuel cell controller 4 are connected through the vehicle CAN network, and the fuel cell controller 4 and the fuel cell radiator controller 6 are connected through the vehicle CAN network.

[0042] The vehicle controller 3 is connected to the GPS system 1 and the speed sensor 2 via the vehicle CAN network to obtain the vehicle's current position and current speed.

[0043] The fuel cell engine 5, fuel cell radiator 7, and heat exchanger 9 are connected via a three-way valve 8, and the fuel cell controller 4 is connected to the three-way valve 8 via the vehicle CAN network; the heat exchanger 9 is connected to the air conditioning system 10.

[0044] Therefore, the implementation principle of the above noise control method and system is as follows: Figure 2 As shown, it specifically includes: S1: The vehicle's current position is located by the GPS system 1 equipped with the vehicle, and the distance between the vehicle's current position and the platform is monitored in real time. The current vehicle speed is monitored in real time by the speed sensor 2 and sent to the vehicle control unit (VCU).

[0045] S2: Determine whether the distance between the vehicle's current position and the platform is less than or equal to a set distance threshold (e.g., 20m) and whether the vehicle speed is less than or equal to a set speed threshold (e.g., ≤3km / h). If so, proceed to step S3; Otherwise, if it is assumed that there are no passengers waiting for the bus near the bus stop and no passengers on the bus want to get off, no special control will be exercised over the vehicle.

[0046] S3: The VCU sends control commands to the fuel cell control unit (FCU); the control commands include controlling the output power of the fuel cell engine 5 to reduce to idle power, and forcibly controlling the speed of the fan of the fuel cell radiator 7 to reduce the noise generated by the radiator by reducing its speed.

[0047] S4: After receiving the control command, the FCU controls the supply conditions of hydrogen, air and coolant to the fuel cell engine 5, and reduces the output power of the fuel cell engine 5 to the idle power. At the same time, it communicates with the fuel cell radiator controller (Electronic Control Unit, ECU) to obtain the duty cycle of each fan of the fuel cell radiator 7.

[0048] S5: Based on experimental data analysis, when the duty cycle of the fan in the fuel cell radiator 7 is less than 30%, the noise generated by the fuel cell radiator 7 will be lower than the noise generated by other components of the vehicle.

[0049] Therefore, when the duty cycle of each fan is less than or equal to 30%, the FCU will not send a command to the ECU to reduce the duty cycle. At this time, the on / off state of the heat exchanger 9 is maintained, and the fuel cell radiator 7 still works normally as required. The fuel cell radiator 7 can meet the heat dissipation requirements of the fuel cell.

[0050] If the fan duty cycle is greater than 30%, proceed to step S6.

[0051] S6: The FCU sends a command to the ECU, forcing the ECU to control the duty cycle of each fan to 30%. However, this will cause the fuel cell radiator 7 to be unable to meet the heat dissipation requirements of the fuel cell. Therefore, the three-way valve 8 is controlled to execute step S7.

[0052] S7: Close the valve between the fuel cell engine 5 and the fuel cell radiator 7, and open the valve from the fuel cell engine 5 to the heat exchanger 9.

[0053] In all other cases, the valve leading directly to the fuel cell radiator 7 is normally open, while the valve leading to the heat exchanger 9 is normally closed.

[0054] S8: After opening the valve from the fuel cell engine 5 to the heat exchanger 9, the fuel cell coolant flows through the heat exchanger 9, at which point the heat exchanger 9 begins to operate. The heat exchanger 9 uses the low temperature of the cooling water from the air conditioning system 10 to lower the temperature of the fuel cell coolant. The coolant, after being cooled by the heat exchanger 9, flows into the fuel cell radiator 7 and then continues to flow back to the fuel cell engine 5. Thus, the cooling requirements of the fuel cell coolant are met through the heat exchanger 9.

[0055] S9: After the vehicle leaves the platform by 20m, the VCU releases the command to forcibly reduce the power demand of the fuel cell and the command to forcefully control the fan speed sent to the FCU. The VCU will then send the power demand to the FCU normally. The FCU will also release the restriction on the ECU to control the fan duty cycle of 30%. The valve of the three-way valve 8 will also be restored to open the valve that directly connects to the fuel cell radiator 7 and close the valve that directly connects to the heat exchanger 9. The heat exchanger 9 will enter the standby state.

[0056] The proposed noise control and heat dissipation solution for fuel cell buses addresses the core pain points of existing technologies that cannot simultaneously achieve noise reduction under high power conditions, vehicle space adaptation, efficient heat dissipation in short periods, and safe operation of fuel cells. Combining the actual operating characteristics of buses, which frequently stop at stations and experience frequent fluctuations in operating conditions, the solution achieves multiple beneficial effects through a combination of precise control strategies and a collaborative heat dissipation structure, as detailed below.

[0057] (1) Effectively reduce vehicle noise and improve the comfort of the surrounding sound environment and user experience.

[0058] By accurately identifying the distance between the vehicle and the platform and the current vehicle speed, noise reduction control is only activated when the vehicle is close to the platform (distance ≤ set threshold) and at a low speed (speed ≤ set threshold), avoiding unnecessary power adjustments that could affect normal vehicle operation. By controlling the fuel cell engine's output power to reduce to idle speed, the load on the cooling system is reduced at the source. Simultaneously, for cooling fans with excessive duty cycles, their duty cycles are reduced, directly weakening the noise output intensity of the main noise source (cooling fans), overcoming the limitation of existing technologies in reducing noise at high power levels. After noise reduction, the auditory experience of passengers waiting at the platform and boarding / alighting is significantly improved, noise interference is reduced, and the comfort and satisfaction of public transportation travel are enhanced.

[0059] (2) Solve the coupling contradiction between heat dissipation and noise reduction, and ensure the safe and stable operation of the fuel cell system.

[0060] To address the issue of insufficient coolant cooling and fuel cell overheating caused by simply reducing fan speed, this solution simultaneously reduces the fan duty cycle, disconnects the fuel cell from the radiator, and opens the connection between the fuel cell and the heat exchanger. The heat exchanger efficiently cools the fuel cell coolant, achieving a balance between noise reduction and heat dissipation. This design is precisely suited to the short stopping times of buses, ensuring rapid coolant cooling even during short stops, despite the fan operating at a low duty cycle. This effectively prevents risks such as overheating alarms and shutdowns due to slow heat dissipation, significantly improving the reliability, stability, and lifespan of the fuel cell system and ensuring driving safety.

[0061] (3) It is suitable for the space constraints of public transport vehicles and has engineering feasibility and mass implementation value.

[0062] This solution does not require altering the original layout of the fuel cell radiator and heat exchanger. It achieves coordinated noise reduction and heat dissipation control simply by optimizing the control logic and switching pipeline connectivity. This avoids the problem of existing technologies that optimize radiator layout for noise reduction but are limited by space constraints in buses. It requires no additional large equipment or significant modifications to the overall vehicle layout, adapting to the compact space requirements of buses. The modification is simple and cost-effective, and can be directly applied to the upgrade of existing fuel cell buses, demonstrating engineering practicality and value for mass production.

[0063] (4) Adapt to the operating conditions of public transport vehicles, taking into account both noise reduction effect and vehicle driving performance.

[0064] This solution uses both distance and vehicle speed thresholds to determine performance. Under normal driving conditions where noise reduction is not required, the fuel cell can maintain normal power output, and the cooling system operates in conventional mode without affecting the vehicle's power performance and driving efficiency. This precise control ensures targeted noise control while avoiding unnecessary power loss, achieving a balance between noise reduction needs and driving performance, and is suitable for the frequent starts, stops, and station stops of buses.

[0065] In further embodiments, a fuel cell vehicle is also provided, including the aforementioned noise control system for fuel cell bus stops at bus stops, for the purpose of achieving noise control for fuel cell bus stops at bus stops.

[0066] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A noise control method for fuel cell buses stopping at bus stops, characterized in that, include: Obtain the distance between the vehicle's current location and the platform, as well as the vehicle's current speed; When the distance is less than or equal to a set distance threshold and the vehicle speed is less than or equal to a set vehicle speed threshold, the output power of the fuel cell engine is reduced, and the duty cycle of each fan of the current fuel cell radiator is obtained. When the fan duty cycle exceeds a set threshold, the fan duty cycle is reduced, the connection between the fuel cell and the fuel cell radiator is disconnected, and the connection between the fuel cell and the heat exchanger is opened to reduce the temperature of the fuel cell coolant in the heat exchanger.

2. The noise control method for fuel cell buses stopping at bus stops as described in claim 1, characterized in that, When the distance is less than or equal to a set distance threshold and the vehicle speed is less than or equal to a set vehicle speed threshold, the output power of the fuel cell engine is reduced to the idle speed power.

3. The noise control method for fuel cell buses stopping at bus stops as described in claim 1, characterized in that, When the duty cycle of each fan is less than or equal to the set proportional threshold, the fuel cell and heat exchanger are kept off, and the radiator operates normally as required.

4. The noise control method for fuel cell buses stopping at bus stops as described in claim 1, characterized in that, When the duty cycle of a fan is greater than a set percentage threshold, the fan is controlled to reduce to the set percentage threshold.

5. The noise control method for fuel cell buses stopping at bus stops as described in claim 1, characterized in that, The set ratio threshold is 30%.

6. The noise control method for fuel cell buses stopping at bus stops as described in claim 1, characterized in that, After the connection between the fuel cell and the heat exchanger is opened, the fuel cell coolant flows through the heat exchanger. Inside the heat exchanger, the temperature of the fuel cell coolant is reduced by the cooling water from the air conditioning system. After being cooled by the heat exchanger, the fuel cell coolant flows back to the fuel cell engine through the fuel cell radiator.

7. A noise control system for fuel cell buses stopping at bus stops, characterized in that, include: The vehicle controller is configured to obtain the distance between the vehicle's current position and the platform, as well as the current vehicle speed. When it is determined that the distance is less than or equal to a set distance threshold and the vehicle speed is less than or equal to a set vehicle speed threshold, it sends a control command to the fuel cell controller. The fuel cell controller is configured to reduce the output power of the fuel cell engine according to the received control command and obtain the duty cycle of each fan of the current fuel cell radiator. When the duty cycle of a fan is greater than a set proportional threshold, the fuel cell radiator controller controls the fan duty cycle to be reduced, and at the same time controls the disconnection between the fuel cell and the fuel cell radiator and the opening of the connection between the fuel cell and the heat exchanger to reduce the temperature of the fuel cell coolant in the heat exchanger.

8. The noise control system for fuel cell buses stopping at bus stops as described in claim 7, characterized in that, The fuel cell controller is integrated into the fuel cell engine, and the fuel cell radiator controller is integrated into the fuel cell radiator. The fuel cell engine, fuel cell radiator, and heat exchanger are connected through a three-way valve. The fuel cell controller is connected to the three-way valve and controls the three-way valve to open and close the connection between the fuel cell and the fuel cell radiator and the connection between the fuel cell and the heat exchanger.

9. A noise control system for fuel cell buses stopping at bus stops as described in claim 7, characterized in that, After the connection between the fuel cell and the heat exchanger is opened, the fuel cell coolant flows through the heat exchanger. Inside the heat exchanger, the temperature of the fuel cell coolant is reduced by the cooling water from the air conditioning system. After being cooled by the heat exchanger, the fuel cell coolant flows back to the fuel cell engine through the fuel cell radiator.

10. A fuel cell vehicle, characterized in that, Including the noise control system as described in any one of claims 7-9.

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