Hydrogen fuel cell internal combustion engine system and control method with exhaust thermal management strategy coupled with EGR

Abstract

This invention relates to a hydrogen fuel cell internal combustion engine system and control method that couples exhaust thermal management strategy with EGR. The hydrogen fuel cell internal combustion engine system includes a hydrogen fuel cell internal combustion engine, an ECU, a dehumidification device, an EGR module, an exhaust heating module, and an aftertreatment device. The aftertreatment device includes an SCR module and a main exhaust pipe. The EGR module includes EGR pipelines and solenoid valves controlling the opening and closing of each EGR pipeline. The EGR pipelines include a wet exhaust gas branch, a dry exhaust gas branch, and a main EGR pipe. The exhaust heating module includes a heating jacket located downstream of the hydrogen fuel cell internal combustion engine exhaust pipe and exhaust pipe branches connected to the upstream and downstream of the hydrogen fuel cell internal combustion engine exhaust pipe, respectively. Compared with existing technologies, this invention can rationally select wet exhaust gas before drying or dry exhaust gas after drying for EGR, ensuring stable operation of the internal combustion engine while efficiently reducing NOx emissions; alleviating the hydrothermal aging problem of the SCR module; and ensuring that the exhaust gas before entering the SCR module is at a temperature suitable for efficient SCR catalysis.

Description

Technical Field

[0001] This invention relates to the field of exhaust aftertreatment technology for hydrogen fuel cell internal combustion engines, and in particular to a hydrogen fuel cell internal combustion engine system and control method that couples exhaust thermal management strategy with EGR. Background Technology

[0002] Selective catalytic reduction (SCR) technology is the most effective way to reduce nitrogen oxide (NOx) emissions from internal combustion engines and is currently widely used in diesel engine exhaust purification. The SCR module uses urea as a reducing agent to reduce NOx through its own catalytic action, ultimately reducing NOx emissions. In hydrogen fuel cell internal combustion engines, especially those using only hydrogen as fuel, NOx is the main emission pollutant. Therefore, the SCR module has become an indispensable after-treatment device for hydrogen fuel cell internal combustion engines. The conversion efficiency of the SCR module is affected by many factors, including NO2 input concentration, reaction temperature, and catalyst. When the exhaust temperature of the internal combustion engine is too low, the NO2 conversion efficiency of the SCR module will decrease significantly.

[0003] Exhaust gas recirculation (EGR) is an external purification measure that recirculates exhaust gas from an internal combustion engine back into the engine. By controlling the opening of the EGR valve, a certain amount of exhaust gas is recirculated into the cylinder of the internal combustion engine to reduce the oxygen content and maximum temperature in the cylinder, thereby reducing NOx emissions.

[0004] Therefore, coupling EGR with exhaust thermal management strategy is of great significance for reducing NOx emissions from hydrogen fuel cell internal combustion engines.

[0005] Patent 201410837974.5 discloses a control method and device for an SCR module. This method adds a correction to the theoretical maximum conversion efficiency of the catalyst. It compares the target conversion efficiency of the catalyst under each operating condition with the theoretical maximum conversion efficiency and selects the smaller one to determine the urea injection amount. This can accurately control the urea injection amount under each operating condition, thereby avoiding excessive urea injection under various engine operating conditions and reducing the risk of ammonia leakage.

[0006] Patent 201580008476.2 discloses a technique for controlling the aftertreatment system of an SCR module. This invention provides control over the amount of reducing agent injected by determining the amount of NOx and / or NH3 escape downstream of the catalyst in the SCR module by disconnecting the NOx-NH3 measurement value from the output of a second NOx sensor.

[0007] Patent 201710011098.4 invented a feedforward control method for an SCR module. It determines the SCR module efficiency urea injection quantity based on air speed, average temperature of the SCR module, NO2 / NOx ratio, NOx mass flow rate, and urea concentration. It achieves precise control of the feedforward urea injection quantity through a correction factor, which greatly reduces the difficulty of subsequent feedback adjustment of urea injection quantity.

[0008] Patent 202211257910.9 invented an EGR intake structure, its parameter calculation method and related equipment. By designing different EGR branches, it reduces the airflow disturbance in front of the turbine, ensures the stability of the turbine's work, reduces the exhaust back pressure of the cylinders on both sides, and improves the consistency of the engine cylinders.

[0009] Patent 202211257890.5 invented an EGR and turbine intake structure, its parameter calculation method and related equipment. By optimizing the design of the EGR branch, the engine cylinder consistency is further improved while reducing the airflow disturbance in front of the turbine and ensuring the turbine's working stability.

[0010] The above patents address the use of SCR modules and EGR in conventional internal combustion engines, but they do not innovate on the SCR modules and EGR for the unique exhaust conditions of hydrogen fuel cell internal combustion engines. These patents do not consider the impact of hydrogen fuel cell internal combustion engine exhaust on the hydrothermal aging of the SCR module, nor the impact of the temperature reduction after exhaust drying by a dehumidifier on the SCR module's conversion efficiency; nor do they consider that moisture in the exhaust of hydrogen fuel cell internal combustion engines can enhance the EGR's effect on reducing in-cylinder temperature. Summary of the Invention

[0011] The purpose of this invention is to overcome the shortcomings of the prior art by providing a hydrogen fuel cell internal combustion engine system and control method that couples exhaust thermal management strategy with EGR, which can regulate the working state of the EGR system according to the working conditions of the hydrogen fuel cell engine, and at the same time provide efficient catalytic conditions for the SCR module based on exhaust thermal management.

[0012] The objective of this invention can be achieved through the following technical solutions:

[0013] The first aspect of the present invention provides a hydrogen fuel cell internal combustion engine system with exhaust thermal management strategy coupled with EGR, the hydrogen fuel cell internal combustion engine system including a hydrogen fuel cell internal combustion engine, an ECU, a dehumidification device, an EGR module, an exhaust heating module and an aftertreatment device, the aftertreatment device including an SCR module and an exhaust manifold main circuit;

[0014] The left end of the dehumidification device is connected to the upstream of the exhaust pipe of the hydrogen fuel internal combustion engine, and the right end is connected to the downstream of the exhaust pipe of the hydrogen fuel internal combustion engine.

[0015] The EGR module includes EGR pipelines and solenoid valves that control the opening and closing of each EGR pipeline.

[0016] The EGR pipeline includes a wet exhaust gas branch, a dry exhaust gas branch, and a main EGR pipeline. The wet exhaust gas branch is connected to the upstream of the exhaust pipe of the hydrogen fuel cell internal combustion engine, the dry exhaust gas branch is connected to the downstream of the exhaust pipe of the hydrogen fuel cell internal combustion engine, and the main EGR pipeline is connected to the wet exhaust gas branch and the dry exhaust gas branch respectively, and the main EGR pipeline is connected to the intake pipe of the hydrogen fuel cell internal combustion engine.

[0017] The solenoid valve includes an EGR valve that controls the opening and closing of the EGR pipeline, and a wet exhaust gas valve and a dry exhaust gas valve that control the opening and closing of the EGR branch.

[0018] The exhaust heating module includes a heating jacket located downstream of the exhaust pipe of the hydrogen fuel internal combustion engine, and exhaust pipe branches connected to the upstream and downstream of the exhaust pipe of the hydrogen fuel internal combustion engine, respectively.

[0019] Furthermore, the exhaust heating module also includes an air pump, a heating air valve, and a one-way valve located on the exhaust pipe branch;

[0020] The heating valve is used to control the opening and closing of the exhaust pipe branch;

[0021] The one-way valve is used to control the direction of exhaust flow, ensuring that the exhaust in the exhaust pipe branch can only flow to the wet exhaust gas branch.

[0022] The heating jacket is wrapped around the outer wall of the main exhaust pipe and is located downstream of the dehumidification device.

[0023] Furthermore, the exhaust pipe branch starts from the upstream of the hydrogen fuel internal combustion engine exhaust pipe and connects to the shell-side inlet of the heating jacket, and connects to the wet exhaust gas branch from the shell-side outlet of the heating jacket.

[0024] Furthermore, the hydrogen fuel internal combustion engine system also includes a first humidity sensor and a second humidity sensor respectively located at both ends of the dehumidification device, a temperature sensor located at the front end of the SCR module, and a control unit;

[0025] The first humidity sensor, the second humidity sensor, and the temperature sensor are respectively connected to the control unit in communication.

[0026] Furthermore, the wet exhaust gas valve and the dry exhaust gas valve are solenoid valves, and the wet exhaust gas valve and the dry exhaust gas valve are respectively communicatively connected to the control unit;

[0027] The control unit controls the opening and closing of the wet exhaust valve and the dry exhaust valve, allowing the exhaust gas from the internal combustion engine to enter the wet exhaust branch or the dry exhaust branch and flow to the main EGR pipe.

[0028] Furthermore, the exhaust gas from the internal combustion engine can enter the exhaust heating module to heat the dried exhaust gas in the main exhaust pipe.

[0029] Furthermore, the control unit monitors the signal from the temperature sensor and controls the heating valve and the air pump to introduce the undehumidified exhaust gas into the heating jacket, heat the exhaust gas in the main exhaust pipe, and allow it to flow into the wet exhaust gas branch through the one-way valve.

[0030] The control unit monitors the signal from the temperature sensor and controls the heating valve and air pump to introduce undehumidified exhaust gas into the heating jacket, heat the exhaust gas in the main exhaust pipe, and then flow into the wet exhaust gas branch through the one-way valve.

[0031] Furthermore, the control unit is communicatively connected to the ECU, EGR valve, wet exhaust gas valve, dry exhaust gas valve, heating gas valve, air pump, first humidity sensor, second humidity sensor, and temperature sensor. The control unit can record data from these sensors and control the opening and closing of the valves and the start and stop of the pump.

[0032] Furthermore, the dehumidification device can be a cooling dehumidification device or an adsorption dehumidification device.

[0033] Furthermore, the EGR module can operate in both wet EGR mode and dry EGR mode.

[0034] A second aspect of the present invention provides a control method for a hydrogen fuel cell internal combustion engine system coupled with an exhaust thermal management strategy as described above, comprising the following steps:

[0035] S1: Calibrate the SCR module;

[0036] S2: Calibrate the hydrogen fuel cell internal combustion engine;

[0037] S3: When the hydrogen fuel cell internal combustion engine is running, the control unit monitors the humidity of the exhaust gas in the upstream and downstream exhaust pipes of the dehumidification device in real time through the first humidity sensor and the second humidity sensor, and records it in the control unit.

[0038] S4: When the hydrogen fuel internal combustion engine is running, the control unit monitors the combustion status signal S value of the hydrogen fuel internal combustion engine in real time through the ECU and stores the S value in the control unit;

[0039] Step 5: When the hydrogen fuel cell internal combustion engine is running, the control unit closes the wet exhaust valve, the dry exhaust valve, and the EGR valve.

[0040] When S≠S e At this time, the control unit closes the dry exhaust gas valve and opens the wet exhaust gas valve and EGR valve, entering the wet EGR operating mode.

[0041] When S = S e the control unit controls to close the wet exhaust gas valve, the dry exhaust gas valve and the EGR valve;

[0042] Step Six: After the wet exhaust gas valve is opened, the control unit keeps monitoring S:

[0043] When S = S e the control unit closes the wet exhaust gas valve, opens the dry exhaust gas valve, and keeps the EGR valve open,

[0044] When S ≠ Se, the control unit continues to monitor S;

[0045] Step Seven: After the dry exhaust gas valve is opened, the control unit keeps monitoring S:

[0046] When S = S e the control unit closes the wet exhaust gas valve, closes the dry exhaust gas valve, closes the EGR valve, and returns to Step Five,

[0047] When S ≠ S e the control unit opens the wet exhaust gas valve, closes the dry exhaust gas valve, and keeps the EGR valve open, and returns to Step Six;

[0048] Step Eight: When the hydrogen fuel internal combustion engine is running, the heating gas valve is closed, the air pump is closed, and the control unit monitors the signal T of the temperature sensor in real time:

[0049] When T < Ti, the control unit controls to open the heating gas valve and open the air pump.

[0050] Furthermore, among them, the T i value is obtained by the following process:

[0051] a. According to the selected SCR module, conduct a catalytic calibration experiment on the gas containing NOx,

[0052] b. Through experiments, determine the gas temperature T i ,

[0053] when the SCR module cannot efficiently catalyze the gas containing NOx, i c. Store T

[0054] in the control unit; e Furthermore, among them, the S

[0055] value is obtained by the following process:

[0056] a. Conduct calibration experiments on the hydrogen fuel internal combustion engine under various working conditions, and use the ECU to monitor and record the in-cylinder combustion situation and power output state of the hydrogen fuel internal combustion engine;

[0057] c. When determining the abnormal combustion state of a hydrogen fuel cell internal combustion engine under various operating conditions, the corresponding S e Value, and S e The value is stored in the control unit.

[0058] Compared with the prior art, the present invention has the following technical advantages:

[0059] 1) The hydrogen fuel cell internal combustion engine system and its control method based on exhaust thermal management strategy coupled with EGR designed in this invention, during the operation of the hydrogen fuel cell internal combustion engine, by real-time monitoring of the internal combustion engine operation, rationally selects wet exhaust before drying or dry exhaust after drying for EGR, so as to ensure stable operation of the internal combustion engine while efficiently reducing NOx emissions.

[0060] 2) This invention dries the exhaust gas using a dehumidification device, thus alleviating the hydrothermal aging problem of the SCR module;

[0061] 3) This invention uses an exhaust heating module to ensure that the exhaust gas before entering the SCR module is at a temperature suitable for the efficient catalysis of the SCR module, thereby further reducing NOx emissions. Attached Figure Description

[0062] Figure 1 This is a schematic diagram of the overall system of the present invention.

[0063] Figure 2 yes Figure 1 A schematic diagram of the heating jacket structure.

[0064] Figure 3 This is a schematic diagram of the control logic of the control unit.

[0065] The attached figures are labeled as follows:

[0066] 100-ECU; 201-EGR valve; 202-Wet exhaust gas valve; 203-Dry exhaust gas valve; 204-Wet exhaust gas branch; 205-Dry exhaust gas branch; 206-Main EGR pipe; 300-Dehumidification device; 401-Heating gas valve; 402-Air pump; 403-Exhaust pipe branch; 404-Heating jacket; 405-One-way valve; 500-SCR module; 501-Main exhaust pipe; 600-Control unit; 601-First humidity sensor; 602-Second humidity sensor; 603-Temperature sensor. Detailed Implementation

[0067] This invention addresses the issue of reduced exhaust temperature and decreased SCR module catalytic efficiency in hydrogen fuel cell internal combustion engines, which require dehumidification, as well as the characteristics of fluctuating exhaust humidity. It proposes a hydrogen fuel cell internal combustion engine system and its control method based on an exhaust thermal management strategy coupled with EGR.

[0068] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Any structural / module names, control modes, algorithms, processes, or composition ratios not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0069] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0070] Example 1

[0071] Combined with appendix Figure 1 The diagram shown is a general schematic of the system of the present invention, including ECU100, EGR module, EGR valve 201, wet exhaust gas valve 202, dry exhaust gas valve 203, wet exhaust gas branch 204, dry exhaust gas branch 205, main EGR pipe 206, dehumidification device 300, exhaust heating module, heating valve 401, air pump 402, exhaust pipe branch 403, heating jacket 404, one-way valve 405, aftertreatment device, SCR module 500, exhaust pipe main 501, control unit 600, first humidity sensor 601, second humidity sensor 602, and temperature sensor 603.

[0072] In specific implementation, the ECU 100 is connected to the control unit 600. The dehumidification device 300, the heating jacket 404, and the SCR module 500 are installed on the main exhaust pipe 501. The first humidity sensor 601 and the second humidity sensor 602 are installed on the main exhaust pipe 501 upstream and downstream of the dehumidification device 300. The temperature sensor 603 is installed on the main exhaust pipe 501 upstream of the SCR module 500.

[0073] In practice, the control unit 600 includes a CPU, ROM, and RAM, which can perform signal processing, instruction transmission, and information storage.

[0074] In specific implementation, the wet exhaust gas branch 204 connects the main exhaust pipe 501 to the main EGR pipe 206, with the connection point located upstream of the dehumidification device 300. The wet exhaust gas valve 202 is installed within the wet exhaust gas branch 204. The dry exhaust gas branch 205 connects the main exhaust pipe 501 to the main EGR pipe 206, with the connection point located downstream of the dehumidification device 300. The dry exhaust gas valve 203 is installed within the dry exhaust gas branch 205, and the EGR valve 201 is installed within the main EGR pipe 206.

[0075] In specific implementation, the exhaust pipe branch 403 connects the heating sleeve 404 to the main exhaust pipe 501 and the wet exhaust gas branch 204, with the connection point to the wet exhaust gas branch 204 located above the wet exhaust gas valve 202. The heating sleeve 404 is located outside the main exhaust pipe 501 and downstream of the dehumidification device 300. The heating valve 401 is installed upstream of the heating sleeve 404 in the exhaust pipe branch 403. The air pump 402 is installed in the exhaust pipe branch 403 downstream of the heating sleeve 404. The one-way valve 405 is installed in the exhaust pipe branch 403 downstream of the heating sleeve 404.

[0076] In specific implementation, the exhaust gas from the hydrogen fuel cell internal combustion engine flows through the main exhaust pipe 501, passes through the dehumidification device 300 to remove moisture, is heated by the heating jacket 404, enters the SCR module 500 for denitrification, and then flows into the atmosphere through the main exhaust pipe 501. The exhaust gas from the hydrogen fuel cell internal combustion engine enters the main EGR pipe 206 through the wet exhaust gas branch 204 or the dry exhaust gas branch 205, and re-enters the cylinder of the hydrogen fuel cell internal combustion engine under the control of the EGR valve 201. The exhaust gas from the hydrogen fuel cell internal combustion engine enters the heating jacket 404 through the exhaust pipe branch 403, under the control of the heating valve 401 and the air pump 402, to heat the exhaust gas in the main exhaust pipe 501, and then returns to the wet exhaust gas branch 204 through the one-way valve 405.

[0077] In specific implementation, the control unit 600 is connected to the first humidity sensor 601, the second humidity sensor 602, the temperature sensor 603, the EGR valve 201, the wet exhaust gas valve 202, the dry exhaust gas valve 203, the heating gas valve 401, and the air pump 402.

[0078] In specific implementation, the first humidity sensor 601 and the second humidity sensor 602 are used to monitor and record the exhaust humidity in the main exhaust pipe 501 upstream and downstream of the dehumidification device, and the temperature sensor 603 is used to monitor and record the exhaust temperature in the main exhaust pipe 501 upstream of the SCR module 500. The control unit 600 compares the measured value of the temperature sensor 603 with the temperature readings. i In comparison, it is determined whether the dried exhaust gas needs to be heated. The ECU 100 is used to monitor and record the parameter S of the combustion conditions in the cylinder of the hydrogen fuel cell internal combustion engine. The control unit 600 compares the measured S value of the ECU 100 with the measured S value of the hydrogen fuel cell internal combustion engine. e The control unit 600 determines the required operating state of the EGR module and adjusts the operating state of the EGR module by controlling the opening states of the EGR valve 201, the wet exhaust gas valve 202, and the dry exhaust gas valve 203.

[0079] Combined with appendix Figure 2 The diagram shown is a structural schematic of the heating jacket 404. The heating jacket 404 is a hollow structure that encloses the main exhaust pipe 501. The undehumidified exhaust gas flows within the heating jacket 404, heating the dehumidified exhaust gas in the main exhaust pipe 501.

[0080] Combined with appendix Figure 3 The diagram shows a flowchart illustrating exemplary steps of the control method execution in the control unit 600. This invention utilizes different connection methods between the EGR branch and the dehumidification device to construct two EGR operating modes: Mode 1: Wet EGR mode, where the exhaust gas from the hydrogen fuel cell internal combustion engine enters the main EGR pipe 206 via the wet exhaust gas branch 204 and the wet exhaust gas valve 202, and then enters the hydrogen fuel cell internal combustion engine intake pipe under the control of the EGR valve 201; Mode 2: Dry EGR mode, where the exhaust gas from the hydrogen fuel cell internal combustion engine is dried by the dehumidification device 300, then enters the main EGR pipe 206 via the dry exhaust gas branch 205 and the dry exhaust gas valve 203, and then enters the hydrogen fuel cell internal combustion engine intake pipe under the control of the EGR valve 201. The present invention utilizes the exhaust heating module. The control unit 600 reads the measured data of the temperature sensor 603 and, when exhaust heating is required, controls the heating gas valve 401 and the gas pump 402 to allow the exhaust gas from the hydrogen fuel internal combustion engine to flow into the heating jacket 404 through the exhaust pipe branch 403 before entering the dehumidification device 300, and then flow through the exhaust pipe branch 403 and the one-way valve 405 into the wet exhaust gas branch 204.

[0081] In step 601, the hydrogen fuel cell internal combustion engine starts operating. In step 602, the ECU 100 begins monitoring the operating conditions of the internal combustion engine. In step 603, the control unit 600 controls the wet exhaust valve 202 to close, controls the dry exhaust valve 203 to close, and controls the EGR valve 201 to close. In step 604, the control unit 600 determines whether S is S. e If S equals S e If S is not equal to S, then return to step 603; e Then proceed to step 605. In step 605, the control unit 600 controls the dry exhaust gas valve 203 to close, controls the wet exhaust gas valve 202 to open, and controls the EGR valve 201 to open, so that the EGR module operates in wet EGR mode. In step 606, the control unit 600 determines whether S is S. e If S is not equal to S e Then return to step 605; if S equals S eThen proceed to step 607. In step 607, the control unit 600 controls the dry exhaust gas valve 203 to open, controls the wet exhaust gas valve 202 to close, and controls the EGR valve 201 to open, so that the EGR module operates in dry EGR mode. In step 608, the control unit 600 determines whether S is S. e If S is not equal to S e Then return to step 605; if S equals S e Then proceed to step 603. In step 609, the control unit 600 controls the heating gas valve 401 to close and the air pump 402 to close. In step 610, the control unit 600 compares the measured value T of the temperature sensor 603 with T... i In comparison, if T is less than T i Then proceed to step 611; if T is not less than T i Then return to step 609. In step 611, the control unit 600 controls the heating gas valve 401 to open and the gas pump 402 to open, allowing the exhaust gas from the hydrogen fuel cell internal combustion engine to enter the exhaust pipe branch 403 and the heating jacket 404, heating the dried exhaust gas in the main exhaust pipe 501. At this point, the control method for the entire hydrogen fuel cell internal combustion engine dehumidification and exhaust gas heating system in conjunction with EGR has been fully implemented.

[0082] In the description of this invention, it should be understood that the terms "upstream," "downstream," "above," "below," "inner," "outer," "middle," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0083] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0084] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A hydrogen fuel cell internal combustion engine system with exhaust thermal management strategy coupled to EGR, the hydrogen fuel cell internal combustion engine system comprising a hydrogen fuel cell internal combustion engine, an ECU (100), a dehumidification device (300), an EGR module, an exhaust heating module, and an aftertreatment device, characterized in that, The aftertreatment device includes an SCR module (500) and an exhaust manifold (501). The dehumidification device (300) is connected at its left end to the upstream end of the exhaust pipe of the hydrogen fuel internal combustion engine and at its right end to the downstream end of the exhaust pipe of the hydrogen fuel internal combustion engine. The EGR module includes EGR pipelines and solenoid valves that control the opening and closing of each EGR pipeline. The EGR pipeline includes a wet exhaust gas branch (204), a dry exhaust gas branch (205), and a main EGR pipeline (206). The wet exhaust gas branch (204) is connected to the upstream exhaust pipe of the hydrogen fuel internal combustion engine, the dry exhaust gas branch (205) is connected to the downstream exhaust pipe of the hydrogen fuel internal combustion engine, and the main EGR pipeline (206) is connected to the wet exhaust gas branch (204) and the dry exhaust gas branch (205) respectively, and the main EGR pipeline (206) is connected to the intake pipe of the hydrogen fuel internal combustion engine. The solenoid valves include an EGR valve (201) for controlling the opening and closing of the EGR pipeline and a wet exhaust gas valve (202) and a dry exhaust gas valve (203) for controlling the opening and closing of the EGR branch. The exhaust heating module includes a heating jacket (404) located downstream of the exhaust pipe of the hydrogen fuel internal combustion engine, and exhaust pipe branches (403) connected to the upstream and downstream of the exhaust pipe of the hydrogen fuel internal combustion engine, respectively.

2. The hydrogen fuel cell internal combustion engine system with exhaust thermal management strategy coupled to EGR according to claim 1, characterized in that, The exhaust heating module also includes an air pump (402), a heating valve (401), and a one-way valve (405) installed on the exhaust pipe branch (403). The heating valve (401) is used to control the opening and closing of the exhaust pipe branch (403); The one-way valve (405) is used to control the direction of exhaust flow, and controls the exhaust in the exhaust pipe branch (403) to flow only to the wet exhaust gas branch (204); The heating jacket (404) is wrapped around the outer wall of the main exhaust pipe (501) and is located downstream of the dehumidification device (300).

3. A hydrogen fuel cell internal combustion engine system with exhaust thermal management strategy coupled to EGR according to claim 2, characterized in that, The exhaust pipe branch (403) starts from the upstream of the hydrogen fuel internal combustion engine exhaust pipe and connects to the shell-side inlet of the heating jacket (404), and connects to the wet exhaust gas branch (204) from the shell-side outlet of the heating jacket (404).

4. A hydrogen fuel cell internal combustion engine system with exhaust thermal management strategy coupled to EGR according to claim 2, characterized in that, The hydrogen fuel internal combustion engine system also includes a first humidity sensor (601) and a second humidity sensor (602) respectively located at both ends of the dehumidification device (300), a temperature sensor (603) located at the front end of the SCR module (500), and a control unit (600). The first humidity sensor (601), the second humidity sensor (602), and the temperature sensor (603) are respectively connected to the control unit (600) in communication.

5. A hydrogen fuel cell internal combustion engine system with exhaust thermal management strategy coupled to EGR according to claim 4, characterized in that, The wet exhaust gas valve (202) and the dry exhaust gas valve (203) are solenoid valves, and the wet exhaust gas valve (202) and the dry exhaust gas valve (203) are respectively connected to the control unit (600) in communication. The control unit (600) controls the opening and closing of the wet exhaust valve (202) and the dry exhaust valve (203) to allow the exhaust gas from the internal combustion engine to enter the wet exhaust branch (204) or the dry exhaust branch (205) and flow to the main EGR pipe (206).

6. A hydrogen fuel cell internal combustion engine system with exhaust thermal management strategy coupled to EGR according to claim 2, characterized in that, The exhaust gas from the internal combustion engine can enter the exhaust heating module to heat the exhaust gas in the main exhaust pipe (501) after it has been dried.

7. A hydrogen fuel cell internal combustion engine system with exhaust thermal management strategy coupled to EGR according to claim 5, characterized in that, The control unit (600) controls the heating gas valve (401) and the air pump (402) by monitoring the signal of the temperature sensor (603), introduces the un-dehumidified exhaust gas into the heating jacket (404), heats the exhaust gas in the main exhaust pipe path (501), and flows into the wet exhaust gas branch (204) through the one-way valve (405).

8. A hydrogen fuel cell internal combustion engine system with exhaust thermal management strategy coupled to EGR according to claim 7, characterized in that, The control unit (600) is communicatively connected to the ECU (100), the EGR valve (201), the wet exhaust gas valve (202), the dry exhaust gas valve (203), the heating gas valve (401), the air pump (402), the first humidity sensor (601), the second humidity sensor (602), and the temperature sensor (603) respectively.

9. A control method for a hydrogen fuel cell internal combustion engine system coupled with an exhaust thermal management strategy as described in any one of claims 1 to 8, characterized in that, It includes the following steps: S1: Calibrate the SCR module (500); S2: Conduct a calibration experiment on the hydrogen fuel internal combustion engine: S3: When the hydrogen fuel internal combustion engine is running, the control unit (600) monitors the humidity of the exhaust gas in the upstream and downstream exhaust pipes of the dehumidification device (300) in real time through the first humidity sensor (601) and the second humidity sensor (602), and records it in the control unit (600); S4: When the hydrogen fuel internal combustion engine is running, the control unit (600) monitors the combustion state signal S value of the hydrogen fuel internal combustion engine in real time through the ECU (100), and stores the S value in the control unit (600); Step Five: When the hydrogen fuel internal combustion engine is running, the control unit (600) controls the wet exhaust gas valve (202) to close, the dry exhaust gas valve (203) to close, and the EGR valve (201) to close; When S≠S e At this time, the control unit (600) controls the dry exhaust gas valve (203) to close, and opens the wet exhaust gas valve (202) and EGR valve (201) to enter the wet EGR working mode. When S=S e At that time, the control unit (600) controls the closure of the wet exhaust gas valve (202), the dry exhaust gas valve (203) and the EGR valve (201). Step Six: After the wet exhaust gas valve (202) is opened, the control unit (600) keeps monitoring S: When S=S e At this time, the control unit (600) closes the wet exhaust gas valve (202), opens the dry exhaust gas valve (203), and keeps the EGR valve (201) open. When S≠Se, the control unit (600) continues to monitor S; Step Seven: After the dry exhaust gas valve (203) is opened, the control unit (600) keeps monitoring S: When S=S e At this time, the control unit (600) closes the wet exhaust gas valve (202), closes the dry exhaust gas valve (203), closes the EGR valve (201), and returns to step five. When S≠S e When the control unit opens the wet exhaust gas valve (202), closes the dry exhaust gas valve (203), keeps the EGR valve (201) open, and returns to step six; Step Eight: When the hydrogen fuel internal combustion engine is running, the heating gas valve (401) is closed, the air pump (402) is closed, and the control unit (600) monitors the signal T of the temperature sensor (603) in real time; When T<Ti, the control unit (600) controls the heating gas valve (401) to open and the air pump (402) to start.

10. The control method for a hydrogen fuel cell internal combustion engine system with exhaust thermal management strategy coupled to EGR according to claim 9, characterized in that, Wherein, T i The value is obtained through the following process: a. Conduct a catalytic calibration experiment on the NOx gas-containing according to the selected SCR module (500); b. The gas temperature T at which the SCR module cannot efficiently catalyze NOx-containing gas was determined experimentally. i , c. T i Stored to the control unit; Among them, S e The value is obtained through the following process: a. Conduct calibration experiments on the hydrogen fuel internal combustion engine under various working conditions, and use the ECU (100) to monitor and record the in-cylinder combustion condition and power output state of the hydrogen fuel internal combustion engine; b. Establish the parameter S characterizing the in-cylinder combustion condition of the hydrogen fuel internal combustion engine; c. When determining the abnormal combustion state of a hydrogen fuel cell internal combustion engine under various operating conditions, the corresponding S e Value, and S e The value is stored in the control unit.

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