A fuel cell electric vehicle tail exhaust control method, tail exhaust device and vehicle

Abstract

The application provides a tail exhaust control method and device of a fuel cell electric vehicle and the vehicle, and relates to the field of new energy vehicles.The tail exhaust control method comprises the following steps: reading a transition temperature value and an ambient temperature value; determining a target hydrogen discharge mode based on the transition temperature value, the ambient temperature value, and a mapping relationship between the transition temperature value, the ambient temperature value, and the hydrogen discharge mode; and switching the hydrogen discharge mode of the fuel cell according to the target hydrogen discharge mode.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicles, specifically to a method for controlling exhaust emissions, an exhaust device, and a vehicle for a fuel cell-powered vehicle. Background Technology

[0002] Fuel cells are power generation devices that convert the chemical energy in fuel and oxidant into electrical energy through a chemical reaction. Due to their energy-saving and environmentally friendly advantages, fuel cells are receiving increasing attention and favor from the public. During normal operation, fuel cells produce clean water, which is discharged in either liquid or gaseous form. In fuel cell-powered vehicles, the produced water is discharged into the external environment through the air outlet of the fuel cell stack.

[0003] However, in cold winters, water generated by the hydrogen fuel cell in fuel cell vehicles can flow through a long exhaust pipe during operation. Due to the low temperature, most of the water, which is originally a gas-liquid mixture, condenses into liquid water. This liquid water is discharged through the exhaust pipe outlet and drips onto the road surface. The water dripping onto the road surface easily freezes into ice at low temperatures, causing following vehicles to skid and potentially leading to accidents. The paper "A Method for Controlling Water Removal and Drying of Hydrogen Path in Fuel Cell Winter Low-Temperature Storage" (Announcement No. CN113224354B) proposes a method for controlling water removal and drying of hydrogen path in fuel cell winter low-temperature storage. This method focuses on the anode, purging the hydrogen path after the fuel cell is shut down to reduce the water content inside the fuel cell, i.e., the amount of ice forming at low temperatures. This helps with system storage or the next start-up, significantly improving efficiency. However, it does not address the potential presence of liquid water in the exhaust pipe of the fuel cell vehicle's air path. Summary of the Invention

[0004] This invention provides a method for controlling exhaust emissions, an exhaust device, and a vehicle for fuel cell-powered vehicles, in order to solve the problem in the prior art where the exhaust pipes of fuel cell-powered vehicles discharge water onto the road surface, which easily causes the road surface to freeze and poses a safety hazard to following vehicles.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A method for controlling exhaust emissions in a fuel cell-powered vehicle, the fuel cell-powered vehicle comprising:

[0007] The exhaust pipe has an inlet and an outlet, the inlet being used to receive exhaust gas emitted by the fuel cell stack in the fuel cell-powered vehicle.

[0008] A catalytic generator is disposed inside the tailpipe and is used to catalyze the exhaust gas discharged from the fuel cell stack to release heat.

[0009] The exhaust control method includes:

[0010] The transition temperature value and the ambient temperature value are read. The transition temperature value is the temperature of the exhaust gas after it has been heated by the catalytic generator.

[0011] Based on the transition temperature value, the ambient temperature value, and the mapping relationship between the transition temperature value, the ambient temperature value, and the hydrogen emission mode, the target hydrogen emission mode is determined.

[0012] The hydrogen emission mode of the fuel cell is switched according to the target hydrogen emission mode.

[0013] In an exemplary embodiment, the hydrogen emission mode includes a normal hydrogen emission mode and an accelerated hydrogen emission mode; within a unit time, the amount of hydrogen emitted in the fuel cell exhaust gas under the accelerated hydrogen emission mode is greater than the amount of hydrogen emitted in the fuel cell exhaust gas under the normal hydrogen emission mode.

[0014] In an exemplary embodiment, determining a target hydrogen emission mode based on the transition temperature value, the ambient temperature value, and the mapping relationship between the transition temperature value, the ambient temperature value, and the hydrogen emission mode includes:

[0015] If the ambient temperature is less than or equal to 0 degrees Celsius and the transition temperature is less than or equal to the first preset value, the target hydrogen emission mode is the accelerated hydrogen emission mode.

[0016] If the ambient temperature is greater than 0 degrees Celsius or the transition temperature is greater than the second preset value, the target hydrogen emission mode is the normal hydrogen emission mode.

[0017] If the ambient temperature is less than or equal to 0 degrees Celsius, and the transition temperature is greater than the first preset value and less than or equal to the second preset value, the target hydrogen emission mode is the accelerated hydrogen emission mode.

[0018] Wherein, the first preset value is less than the second preset value.

[0019] In one exemplary embodiment, the accelerated hydrogen emission mode increases the amount of hydrogen emitted by increasing the number of hydrogen emissions per unit time.

[0020] In one exemplary embodiment, switching the hydrogen emission mode of the fuel cell according to the target hydrogen emission mode includes:

[0021] Obtain the current hydrogen emission mode and compare it with the target hydrogen emission mode.

[0022] If the current hydrogen emission mode is different from the target hydrogen emission mode, then the hydrogen emission mode of the fuel cell is switched to the target hydrogen emission mode;

[0023] If the current hydrogen emission mode is the same as the target hydrogen emission mode, then the current hydrogen emission mode shall be maintained.

[0024] In an exemplary embodiment, the difference between the second preset value and the first preset value is ≥3 degrees Celsius.

[0025] An exhaust system for a fuel cell-powered vehicle includes:

[0026] The tailpipe has an inlet and an outlet, the inlet being used to receive the exhaust gas discharged from the fuel cell stack;

[0027] A catalytic generator is disposed inside the tailpipe and is used to catalyze the exhaust gas discharged from the fuel cell stack to release heat.

[0028] A temperature testing unit, which is used to measure the transition temperature value and the ambient temperature value;

[0029] A logic comparison unit is used to determine a target hydrogen emission mode based on the transition temperature value, the ambient temperature value, and the mapping relationship between the transition temperature value, the ambient temperature value, and the hydrogen emission mode.

[0030] A hydrogen emission control unit is used to switch the hydrogen emission mode of the fuel cell according to the target hydrogen emission mode.

[0031] In one exemplary embodiment, the catalytic generator is provided with a porous structure.

[0032] In one exemplary embodiment, the fuel cell of the fuel cell-powered vehicle is a hydrogen fuel cell, and the catalyst in the catalytic generator is platinum.

[0033] In an exemplary embodiment, the temperature testing unit includes a first temperature sensor and a second temperature sensor. The first temperature sensor is disposed at the exhaust port of the tailpipe, and the second temperature sensor is disposed inside the tailpipe, located between the catalytic generator and the exhaust port.

[0034] In one exemplary embodiment, the second temperature sensor is located near the catalytic generator.

[0035] An automobile includes a fuel cell and an exhaust system for a fuel cell-powered vehicle as described above, wherein the fuel cell is connected to the exhaust system.

[0036] The beneficial effects of this invention are:

[0037] By reading the transition temperature of the exhaust gas heated by the catalytic converter and the ambient temperature, the gas-liquid state of the water at the exhaust pipe outlet can be predicted. Through the mapping relationship between the transition temperature, the ambient temperature, and the hydrogen emission mode, the target hydrogen emission mode can be determined. When the exhaust gas heat is insufficient and the gaseous water condenses into liquid water, the hydrogen emission mode can be adjusted to allow the catalytic converter to release more heat, increasing the exhaust gas temperature. This temperature increase ensures that the water in the exhaust gas remains gaseous before exiting the exhaust pipe, preventing the formation of ice on the road after being released into the atmosphere and ensuring driving safety. Attached Figure Description

[0038] Figure 1 This is a flowchart illustrating the exhaust control method for fuel cell-powered vehicles according to the present invention.

[0039] Figure 2 This is a flowchart of the exhaust control method for fuel cell-powered vehicles according to the present invention.

[0040] Figure 3 This is a schematic diagram of the exhaust system of the fuel cell-powered vehicle of the present invention.

[0041] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle.

[0042] Figure 5 This is a schematic diagram of the catalytic generator of the present invention.

[0043] Figure 6 For the present invention Figure 5 Sectional view at point BB.

[0044] Figure 7 This is a structural block diagram of the exhaust device for the fuel cell-powered vehicle of the present invention.

[0045] Among them, 1-muffler; 2-catalytic generator; 3-second temperature sensor; 4-first temperature sensor; 5-tailpipe; 6-porous structure. Detailed Implementation

[0046] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0047] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0048] like Figure 1 As shown, this embodiment proposes an exhaust control method for a fuel cell-powered vehicle. The fuel cell-powered vehicle includes an exhaust pipe 5 and a catalytic generator 2. The exhaust pipe 5 has an inlet and an outlet. The inlet is used to receive the exhaust gas discharged from the fuel cell stack in the fuel cell-powered vehicle. The catalytic generator is installed inside the exhaust pipe 5 and is used to catalyze the exhaust gas discharged from the fuel cell stack to release heat.

[0049] Because the exhaust gas contains water generated from the chemical reaction of the fuel cell, this water is typically released into the atmosphere in gaseous form through the exhaust pipe. However, in cold winters, when the outside temperature is below 0°C, the water generated during normal operation of a fuel cell-powered vehicle can easily condense in the exhaust pipe, forming liquid water. This liquid water droplets falling onto the road surface can create ice, causing following vehicles to slip and posing a safety hazard. The exhaust gas emitted from the fuel cell stack contains hydrogen-containing fuel materials. The catalytic generator contains a catalyst that catalyzes these hydrogen-containing fuel materials. When the hydrogen-containing fuel materials come into contact with the catalyst, a catalytic reaction occurs. This catalytic reaction is exothermic, releasing heat to heat the exhaust gas, preventing the water generated below 0°C from condensing and being discharged as a liquid, thus avoiding a safety accident.

[0050] In one exemplary embodiment, the vehicle is equipped with a first temperature sensor 4 for measuring the ambient temperature and a second temperature sensor 3 for measuring the temperature near the catalytic converter. The first temperature sensor 4 is located at the exhaust port of the exhaust pipe 5, and the second temperature sensor 3 is located inside the exhaust pipe 5 between the catalytic converter and the exhaust port, close to the catalytic converter. The second sensor can measure the temperature of the exhaust gas heated by the catalytic converter. Based on the temperature values ​​from the first and second sensors, subsequent strategy adjustments can be made to prevent water generated by the fuel cell from dripping onto the road surface in a liquid state. In another exemplary embodiment, the first temperature sensor 4 can be located in other positions within the vehicle, depending on whether it can measure the actual ambient temperature.

[0051] Exhaust control methods include:

[0052] S110: Read the transition temperature value and the ambient temperature value. The transition temperature value is the temperature value of the exhaust gas after being heated by the catalytic generator.

[0053] S120: Determine the target hydrogen emission mode based on the transition temperature value, the ambient temperature value, and the mapping relationship between the transition temperature value, the ambient temperature value, and the hydrogen emission mode.

[0054] The target hydrogen emission mode is the hydrogen emission mode that a fuel cell vehicle should operate in during its operation, based on the transition temperature value, the ambient temperature value, and the mapping relationship between the transition temperature value, the ambient temperature value, and the hydrogen emission mode. The hydrogen emission mode refers to different ways in which hydrogen-containing fuel substances are discharged into the exhaust pipe 5, and this hydrogen emission mode is divided according to the amount of hydrogen emitted per unit time.

[0055] The hydrogen emission modes include a normal hydrogen emission mode and an accelerated hydrogen emission mode. In a unit of time, the amount of hydrogen emitted from the fuel cell exhaust gas in the accelerated hydrogen emission mode is greater than that in the normal hydrogen emission mode. In one exemplary embodiment, the accelerated hydrogen emission mode increases the amount of hydrogen emitted by increasing the number of hydrogen emission cycles per unit of time. In another exemplary embodiment, the accelerated hydrogen emission mode increases the total amount of hydrogen emitted by increasing the amount of hydrogen emitted each time per unit of time. By increasing the amount of hydrogen emitted per unit of time, the content of hydrogen-containing fuel material in the catalytic generator can be increased. By increasing the content of fuel material in the catalytic generator, the fuel material can release more heat in the catalytic generator to heat the exhaust gas.

[0056] In an exemplary embodiment, step S120 determines the target hydrogen emission mode based on the transition temperature value, the ambient temperature value, and the mapping relationship between the transition temperature value, the ambient temperature value, and the hydrogen emission mode, and further includes step S210.

[0057] S210: If the ambient temperature is greater than 0 degrees Celsius or the transition temperature is greater than the second preset value, the target hydrogen emission mode is the normal hydrogen emission mode; if the ambient temperature is less than or equal to 0 degrees Celsius and the transition temperature is greater than the first preset value and less than or equal to the second preset value, the target hydrogen emission mode is the accelerated hydrogen emission mode; wherein, the first preset value is less than the second preset value.

[0058] When the ambient temperature is below 0°C and the transition temperature is less than or equal to a first preset temperature, the water generated after the fuel cell reaction generates electricity is easily spilled onto the road surface in liquid form, forming ice. This can cause vehicles behind to slip on the ice, posing a safety hazard. Therefore, when the ambient temperature is below 0°C and the transition temperature is less than or equal to the first preset temperature, the hydrogen emission mode needs to be switched to an accelerated hydrogen emission mode to increase the amount of hydrogen emitted. In one exemplary embodiment, the accelerated hydrogen emission mode increases the amount of hydrogen emitted by increasing the number of hydrogen emissions per unit time. In another exemplary embodiment, the accelerated hydrogen emission mode increases the total amount of hydrogen emitted per unit time by increasing the amount of hydrogen emitted in a single emission. When the ambient temperature is below 0°C and the transition temperature is greater than a second preset temperature, although the ambient temperature is below 0°C and liquid water in the atmosphere is prone to condense into ice, the transition temperature is greater than the second preset temperature, ensuring that the water in the exhaust gas flows in gaseous form within the exhaust pipe and is discharged into the atmosphere, making it difficult for it to condense and form streams of water.

[0059] In one exemplary embodiment, the difference between the second preset value and the first preset value is ≥3℃. Setting the difference between the second preset value and the first preset value to 3℃ ensures that when the hydrogen emission mode switches from accelerated hydrogen emission mode to normal hydrogen emission mode, the transition temperature value remains above the first preset value for a certain period of time. This prevents the hydrogen emission mode of the fuel cell vehicle from frequently switching back and forth between normal hydrogen emission mode and accelerated hydrogen emission mode. For example, when the hydrogen emission mode of the fuel cell vehicle is accelerated hydrogen emission mode and the ambient temperature is less than or equal to 0℃, if the difference between the first preset value and the second preset value is too small, and the transition temperature value gradually rises to the second preset value, the fuel cell vehicle may switch from accelerated hydrogen emission mode to normal hydrogen emission mode and then back to accelerated hydrogen emission mode in a short period of time. In another exemplary embodiment, the difference between the second preset value and the first preset value can be set to other values ​​according to the actual situation. In another exemplary embodiment, the first preset value, the second preset value, and the difference between the first preset value and the second preset value can all be variables, and the above values ​​can be determined according to the actual system strategy and calibration results.

[0060] S130: Switch the hydrogen emission mode of the fuel cell according to the target hydrogen emission mode.

[0061] In an exemplary embodiment, step S130, which switches the hydrogen emission mode of the fuel cell according to the target hydrogen emission mode, further includes step S310.

[0062] S310: Obtain the current hydrogen emission mode, compare the current hydrogen emission mode with the target hydrogen emission mode. If the current hydrogen emission mode is different from the target hydrogen emission mode, switch the hydrogen emission mode of the fuel cell to the target hydrogen emission mode; if the current hydrogen emission mode is the same as the target hydrogen emission mode, keep the current hydrogen emission mode.

[0063] The current hydrogen emission mode is the one currently being used by fuel cell vehicles. The target hydrogen emission mode is determined based on the transition temperature value, the ambient temperature value, and the mapping relationship between these values ​​and the hydrogen emission mode. By comparing the current and target hydrogen emission modes, it can be determined whether the current mode needs to be switched.

[0064] like Figure 2 As shown, during operation, the fuel cell-powered vehicle reads the ambient temperature in real time. If the ambient temperature is greater than 0°C, the fuel cell-powered vehicle uses the normal hydrogen emission mode. If the ambient temperature is less than or equal to 0°C, the vehicle reads the transition temperature, which is the temperature of the exhaust gas after passing through the catalytic generator 2. If the transition temperature is greater than the first preset temperature, the fuel cell-powered vehicle uses the normal hydrogen emission mode. If the transition temperature is less than or equal to the first preset temperature, the vehicle uses the accelerated hydrogen emission mode. The accelerated hydrogen emission mode increases the frequency of hydrogen emission per unit time, thereby increasing the amount of hydrogen emitted. The hydrogen fuel can release more heat in the catalytic generator to heat the exhaust gas. When the hydrogen emission mode of a fuel cell electric vehicle is in accelerated hydrogen emission mode, if the ambient temperature is greater than 0°C, the hydrogen emission mode of the fuel cell electric vehicle switches to normal hydrogen emission mode. If the ambient temperature is less than or equal to 0°C, the transition temperature value is read. If the transition temperature value is greater than a first preset value, the hydrogen emission mode of the fuel cell electric vehicle switches to normal hydrogen emission mode. If the transition temperature value is less than or equal to the first preset value, the hydrogen emission mode of the fuel cell electric vehicle remains in accelerated hydrogen emission mode.

[0065] In summary, by reading the transition temperature value of the exhaust gas heated by the catalytic converter and the ambient temperature value, the gas-liquid state of the water at the outlet of the exhaust pipe 5 can be predicted. By analyzing the transition temperature value, the ambient temperature value, and the mapping relationship between the transition temperature value, the ambient temperature value, and the hydrogen emission mode, the target hydrogen emission mode can be determined. When the exhaust gas is not hot enough and the gaseous water in it will condense and liquefy into liquid water, the hydrogen emission mode can be adjusted to allow the catalytic converter to release more heat, thereby increasing the temperature of the exhaust gas. This ensures that the water in the exhaust gas remains in a gaseous state before being discharged from the exhaust pipe 5, preventing the formation of ice on the road after being discharged into the atmosphere and ensuring driving safety.

[0066] like Figures 3 to 5 As shown, this embodiment proposes an exhaust device for a fuel cell-powered vehicle, comprising:

[0067] Tail exhaust pipe 5 has an inlet and an outlet. The inlet is used to receive the exhaust gas discharged from the fuel cell stack.

[0068] The catalytic generator is installed in the tailpipe 5. The catalytic generator 2 is used to catalyze the exhaust gas discharged from the fuel cell stack to release heat.

[0069] Temperature testing unit, used to measure transition temperature and ambient temperature;

[0070] The logic comparison unit is used to determine the target hydrogen emission mode based on the transition temperature value, the ambient temperature value, and the mapping relationship between the transition temperature value, the ambient temperature value and the hydrogen emission mode.

[0071] The hydrogen emission control unit is used to switch the hydrogen emission mode of the fuel cell according to the target hydrogen emission mode.

[0072] In one exemplary embodiment, a porous structure 6 is provided within the catalytic generator 2. The catalyst is attached to the framework of the porous structure 6, which increases the contact area between the exhaust gas and the catalyst, thereby increasing the catalytic efficiency of the catalyst and enhancing the catalytic heating effect on the exhaust gas. In another exemplary embodiment, the porous structure 6 within the catalytic generator 2 is similar to the pore structure of a sponge. In yet another exemplary embodiment, the porous structure 6 within the catalytic generator 2 has a plurality of parallel unit pores, the pores of which are arranged along the extension direction of the exhaust pipe.

[0073] In one exemplary embodiment, the fuel cell in the fuel cell-powered vehicle is a hydrogen fuel cell, which uses hydrogen as fuel and air or oxygen as an oxidant to generate electricity. The catalyst in the catalytic generator 2 is platinum. Platinum can catalyze a vigorous exothermic reaction between hydrogen and oxygen at room temperature. The heat generated by the catalytic generator 2 can heat the exhaust gas, increasing its temperature and preventing gaseous water in the exhaust gas from condensing into liquid water due to temperature reduction. In another exemplary embodiment, the fuel cell in the fuel cell-powered vehicle can be any other fuel cell containing hydrogen.

[0074] In one exemplary embodiment, the temperature testing unit includes a first temperature sensor 4 and a second temperature sensor 3. The first temperature sensor 4 is disposed at the exhaust port of the tailpipe 5, and the second temperature sensor 3 is disposed inside the tailpipe 5, located between the catalytic converter and the exhaust port. The second temperature sensor 3 is close to the catalytic converter.

[0075] In an exemplary embodiment, a muffler 1 for reducing or eliminating noise is provided on the tailpipe 5, and the muffler 1 is located away from the outlet of the catalytic generator 2. The muffler 1 can attenuate or reflect the noise in the tailpipe 5, thereby reducing or eliminating the noise in the tailpipe 5.

[0076] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A method for controlling exhaust emissions in a fuel cell-powered vehicle, characterized in that, The fuel cell-powered vehicles include: The exhaust pipe has an inlet and an outlet. The inlet is used to receive the exhaust gas discharged from the fuel cell stack in the fuel cell vehicle. The exhaust gas includes anode exhaust gas and cathode exhaust gas. A catalytic generator is disposed in the tailpipe and contains a catalyst for an exothermic reaction between hydrogen and oxygen in the exhaust gas discharged from the fuel cell stack. The exhaust control method includes: The transition temperature value and the ambient temperature value are read. The transition temperature value is the temperature of the exhaust gas after it has been heated by the catalytic generator. Based on the transition temperature value, the ambient temperature value, and the mapping relationship between the transition temperature value, the ambient temperature value, and the hydrogen emission mode, the target hydrogen emission mode is determined. The hydrogen emission mode of the fuel cell is switched according to the target hydrogen emission mode.

2. The exhaust control method for fuel cell-powered vehicles according to claim 1, characterized in that, The hydrogen emission modes include normal hydrogen emission mode and accelerated hydrogen emission mode; Within a unit of time, the amount of hydrogen emitted from the fuel cell exhaust gas in the accelerated hydrogen emission mode is greater than the amount of hydrogen emitted from the fuel cell exhaust gas in the normal hydrogen emission mode.

3. The exhaust control method for fuel cell-powered vehicles according to claim 2, characterized in that: Based on the transition temperature value, the ambient temperature value, and the mapping relationship between the transition temperature value, the ambient temperature value, and the hydrogen emission mode, the target hydrogen emission mode is determined, including: If the ambient temperature is less than or equal to 0 degrees Celsius and the transition temperature is less than or equal to the first preset value, the target hydrogen emission mode is the accelerated hydrogen emission mode. If the ambient temperature is greater than 0 degrees Celsius or the transition temperature is greater than the second preset value, the target hydrogen emission mode is the normal hydrogen emission mode. If the ambient temperature is less than or equal to 0 degrees Celsius, and the transition temperature is greater than the first preset value and less than or equal to the second preset value, the target hydrogen emission mode is the accelerated hydrogen emission mode. Wherein, the first preset value is less than the second preset value.

4. The exhaust control method for fuel cell-powered vehicles according to claim 2, characterized in that, The accelerated hydrogen emission mode increases the amount of hydrogen emitted by increasing the number of hydrogen emission cycles per unit time.

5. The exhaust control method for fuel cell-powered vehicles according to claim 1, characterized in that, According to the target hydrogen emission mode, switching the hydrogen emission mode of the fuel cell includes: Obtain the current hydrogen emission mode and compare it with the target hydrogen emission mode. If the current hydrogen emission mode is different from the target hydrogen emission mode, then the hydrogen emission mode of the fuel cell is switched to the target hydrogen emission mode; If the current hydrogen emission mode is the same as the target hydrogen emission mode, then the current hydrogen emission mode shall be maintained.

6. The exhaust control method for fuel cell-powered vehicles according to claim 3, characterized in that: The difference between the second preset value and the first preset value is ≥3 degrees Celsius.

7. An exhaust system for a fuel cell-powered vehicle, characterized in that, include: The tailpipe has an inlet and an outlet. The inlet is used to receive the exhaust gas discharged from the fuel cell stack. The exhaust gas includes anode exhaust gas and cathode exhaust gas. A catalytic generator is disposed in the tailpipe and contains a catalyst for an exothermic reaction between hydrogen and oxygen in the exhaust gas discharged from the fuel cell stack. A temperature testing unit is used to measure the transition temperature value and the ambient temperature value, wherein the transition temperature value is the temperature value of the exhaust gas after being heated by the catalytic generator. A logic comparison unit is used to determine a target hydrogen emission mode based on the transition temperature value, the ambient temperature value, and the mapping relationship between the transition temperature value, the ambient temperature value, and the hydrogen emission mode. A hydrogen emission control unit is used to switch the hydrogen emission mode of the fuel cell according to the target hydrogen emission mode.

8. The exhaust device for a fuel cell-powered vehicle according to claim 7, characterized in that: The catalytic generator is equipped with a porous structure.

9. The exhaust device for a fuel cell-powered vehicle according to claim 7, characterized in that: The fuel cell in the fuel cell-powered vehicle is a hydrogen fuel cell, and the catalyst in the catalytic generator is platinum.

10. The exhaust device for a fuel cell-powered vehicle according to claim 7, characterized in that: The temperature testing unit includes a first temperature sensor and a second temperature sensor. The first temperature sensor is located at the exhaust port of the tailpipe, and the second temperature sensor is located inside the tailpipe, between the catalytic generator and the exhaust port.

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