Hydrogen internal combustion engine nitrogen oxide emission control method, controller, and vehicle

Abstract

The application discloses a hydrogen internal combustion engine nitrogen oxide emission control method, a controller and a vehicle, and is applied to a post-processing controller in a hydrogen internal combustion engine nitrogen oxide emission control device. The method comprises the following steps: when a hydrogen internal combustion engine is cold started, the cooling water temperature of the hydrogen internal combustion engine is obtained; if the cooling water temperature is lower than a first preset temperature, the cooling water heating vaporization circuit is disconnected from the cooling water pipeline of the hydrogen internal combustion engine, and liquid hydrogen in an external liquid hydrogen tank is controlled to enter the tail gas heating vaporization circuit to be vaporized in the tail gas heating vaporization circuit, so that the tail gas temperature in the tail gas heating vaporization circuit is reduced; if the cooling water temperature reaches the first preset temperature, the temperature of the tail gas output by the tail gas heating vaporization circuit is obtained; according to the temperature of the tail gas output by the tail gas heating vaporization circuit, the cooling water heating vaporization circuit is controlled to be disconnected or connected with the cooling water pipeline of the hydrogen internal combustion engine, and the liquid hydrogen in the external liquid hydrogen tank is controlled to enter the tail gas heating vaporization circuit and / or the cooling water heating vaporization circuit. The method can effectively improve the engine economy of the vehicle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle exhaust aftertreatment, in particular to a hydrogen internal combustion engine nitrogen oxide emission control method, a controller and a vehicle. BACKGROUND

[0002] Hydrogen fuel engines, as a clean energy technology, have relatively less pollutants, but there are still some. The main pollutant of hydrogen fuel engines is nitrogen oxide (NOx), because in the hydrogen fuel combustion process, due to high temperature conditions, a certain amount of nitrogen oxides, including nitric oxide (NO) and nitrogen dioxide (NO2), may be produced.

[0003] Hydrogen internal combustion engines use liquid hydrogen storage, which needs to be vaporized before being injected and combusted in actual application. Generally, hydrogen vaporizers use engine cooling water for heating and vaporization, but this scheme has the problem that the engine cooling water is not enough, especially when the engine is cold started, the cooling water temperature is low, the liquid hydrogen vaporization is insufficient, and the gas-liquid mixing phenomenon affects combustion. Liquid hydrogen vaporization absorbs a large amount of heat, which also causes the engine cooling water temperature to drop sharply, affecting the engine economy. SUMMARY

[0004] The embodiment of the present application provides a hydrogen internal combustion engine nitrogen oxide emission control method, a controller and a vehicle, which solves the problem of insufficient liquid hydrogen vaporization by controlling the connection and disconnection of the exhaust gas heating and vaporization circuit and the cooling water heating and vaporization circuit, avoids the problem that the engine cooling water temperature drops sharply due to the large amount of heat absorbed by liquid hydrogen vaporization, and improves the engine economy of the vehicle, greatly improving the user experience.

[0005] In a first aspect, the present application provides the following technical scheme through an embodiment of the present application:

[0006] A hydrogen internal combustion engine nitrogen oxide emission control method applied to a post-processing controller in a hydrogen internal combustion engine nitrogen oxide emission control device, the device further comprising a hydrogen internal combustion engine, an exhaust gas heating and vaporization circuit and a cooling water heating and vaporization circuit, the exhaust gas heating and vaporization circuit being in communication with the exhaust pipe of the hydrogen internal combustion engine, and the method comprising:

[0007] The cooling water temperature of the hydrogen internal combustion engine is obtained when the hydrogen internal combustion engine is cold started; if the cooling water temperature is lower than a first preset temperature, the cooling water heating vaporization circuit is disconnected from the cooling water pipeline of the hydrogen internal combustion engine, and liquid hydrogen in an external liquid hydrogen tank is controlled to enter the tail gas heating vaporization circuit, vaporization occurs in the tail gas heating vaporization circuit to reduce the tail gas temperature in the tail gas heating vaporization circuit; if the cooling water temperature reaches the first preset temperature, the temperature of the tail gas output by the tail gas heating vaporization circuit is obtained; according to the temperature of the tail gas output by the tail gas heating vaporization circuit, the cooling water heating vaporization circuit is controlled to be disconnected or connected with the cooling water pipeline of the hydrogen internal combustion engine, and liquid hydrogen in the external liquid hydrogen tank is controlled to enter the tail gas heating vaporization circuit and / or the cooling water heating vaporization circuit.

[0008] Preferably, the device further comprises a tail gas treatment circuit, the tail gas treatment circuit comprising a catalyst reducer provided with a reduction catalyst, the catalyst reducer being in communication with the output end of the tail gas heating vaporization circuit, and the control of the cooling water heating vaporization circuit to be disconnected or connected with the cooling water pipeline of the hydrogen internal combustion engine and the control of liquid hydrogen in the external liquid hydrogen tank to enter the tail gas heating vaporization circuit and / or the cooling water heating vaporization circuit according to the temperature of the tail gas output by the tail gas heating vaporization circuit comprises: obtaining a first switching temperature and a second switching temperature of the reduction catalyst, wherein the first switching temperature and the second switching temperature are determined based on a conversion efficiency-temperature relationship curve of the reduction catalyst, the first switching temperature being less than the second switching temperature; determining a first target temperature and a second target temperature based on the first switching temperature, the second switching temperature and a preset concentration value, wherein the first target temperature is less than or equal to the first switching temperature, and the second target temperature is greater than or equal to the second switching temperature; controlling the cooling water heating vaporization circuit to be disconnected or connected with the cooling water pipeline of the hydrogen internal combustion engine and controlling liquid hydrogen in the external liquid hydrogen tank to enter the tail gas heating vaporization circuit and / or the cooling water heating vaporization circuit based on the first switching temperature, the second switching temperature, the first target temperature, the second target temperature and the tail gas temperature.

[0009] Preferably, the reduction catalyst is an H2-SCR catalyst.

[0010] Preferably, the obtaining the first switching temperature and the second switching temperature of the H2-SCR catalyst comprises: obtaining a conversion efficiency-temperature curve of the H2-SCR catalyst, the curve being obtained by a temperature verification test of the H2-SCR catalyst, the abscissa of the curve being temperature, and the ordinate being conversion efficiency; determining a low-temperature nitrogen oxide conversion efficiency inflection point and a high-temperature nitrogen oxide conversion efficiency inflection point of the H2-SCR catalyst according to the curve; determining the first switching temperature according to the low-temperature nitrogen oxide conversion efficiency inflection point, and determining the second switching temperature according to the high-temperature nitrogen oxide conversion efficiency inflection point.

[0011] Preferably, the determining the first target temperature and the second target temperature based on the first switching temperature, the second switching temperature and a preset concentration value comprises: performing a temperature correction step based on the first switching temperature and the second switching temperature, wherein the first switching temperature is reduced by a preset step size, and the second switching temperature is increased by the preset step size, to obtain an adjusted first switching temperature and an adjusted second switching temperature; determining whether the exhaust emission concentration at the output end of the catalyst reducer after the H2-SCR catalyst based on the adjusted first switching temperature and the adjusted second switching temperature is within the preset concentration value, and if not, repeating the temperature correction step based on the adjusted first switching temperature and the adjusted second switching temperature until the exhaust emission concentration at the output end of the catalyst reducer is within the preset concentration value.

[0012] Preferably, the controlling the cooling water heating vaporization circuit and the cooling water pipeline of the hydrogen internal combustion engine to be disconnected or connected, and controlling the liquid hydrogen in the external liquid hydrogen tank to enter the exhaust gas heating vaporization circuit and / or the cooling water heating vaporization circuit based on the first switching temperature, the second switching temperature, the first target temperature, the second target temperature and the exhaust gas temperature comprises: if the exhaust gas temperature is lower than the first target temperature or between the first target temperature and the first switching temperature, controlling the cooling water heating vaporization circuit and the cooling water pipeline of the hydrogen internal combustion engine to be connected, and controlling the liquid hydrogen in the external liquid hydrogen tank to enter the cooling water heating vaporization circuit; if the exhaust gas temperature is between the first switching temperature and the second switching temperature, controlling the cooling water heating vaporization circuit and the cooling water pipeline of the hydrogen internal combustion engine to be disconnected or connected, and controlling the liquid hydrogen in the external liquid hydrogen tank to enter the exhaust gas heating vaporization circuit and the cooling water heating vaporization circuit; if the exhaust gas temperature is greater than the second target temperature, controlling the cooling water heating vaporization circuit and the cooling water pipeline of the hydrogen internal combustion engine to be disconnected, and controlling the liquid hydrogen in the external liquid hydrogen tank to enter the exhaust gas heating vaporization circuit.

[0013] Preferably, the tail gas heating vaporization circuit comprises a first vaporizer and a hydrogen distribution proportional valve connected in sequence, an input end of the hydrogen distribution proportional valve is connected with a liquid hydrogen tank, a first output end of the hydrogen distribution proportional valve is connected with a liquid hydrogen input port of the first vaporizer through a pipeline, the post-processing controller is electrically connected with a control end of the hydrogen distribution proportional valve, and the control of the liquid hydrogen in the liquid hydrogen tank into the tail gas heating vaporization circuit comprises: controlling the first output end of the hydrogen distribution proportional valve to be closed, so that the liquid hydrogen in the liquid hydrogen tank enters the first vaporizer from the hydrogen distribution proportional valve.

[0014] Preferably, the cooling water heating vaporization circuit comprises a second vaporizer and a cooling water control valve connected in sequence, a second output end of the hydrogen distribution proportional valve is connected with a liquid hydrogen input port of the second vaporizer through a pipeline, the post-processing controller is electrically connected with a control end of the cooling water control valve, and the control of the cooling water heating vaporization circuit being disconnected or communicated with the cooling water pipeline of the hydrogen internal combustion engine comprises: controlling the cooling water control valve to be disconnected or communicated; and the control of the liquid hydrogen in the liquid hydrogen tank into the cooling water heating vaporization circuit comprises: controlling the second output end of the hydrogen distribution proportional valve to be closed, so that the liquid hydrogen in the liquid hydrogen tank enters the second vaporizer from the hydrogen distribution proportional valve.

[0015] In a second aspect, an embodiment of the present application provides the following technical solutions:

[0016] A post-processing controller comprises:

[0017] A first acquisition module is configured to acquire a cooling water temperature of a hydrogen internal combustion engine when the hydrogen internal combustion engine is cold started;

[0018] A first control module is configured to control a cooling water heating vaporization circuit to be disconnected from a cooling water pipeline of the hydrogen internal combustion engine and control liquid hydrogen in a liquid hydrogen tank to enter a tail gas heating vaporization circuit when the cooling water temperature is lower than a first preset temperature, so that vaporization occurs in the tail gas heating vaporization circuit to reduce a tail gas temperature in the tail gas heating vaporization circuit.

[0019] A second acquisition module is configured to acquire a temperature of tail gas output by the tail gas heating vaporization circuit when the cooling water temperature reaches the first preset temperature.

[0020] A second control module is configured to control the cooling water heating vaporization circuit to be disconnected or communicated with the cooling water pipeline of the hydrogen internal combustion engine and control the liquid hydrogen in the liquid hydrogen tank to enter the tail gas heating vaporization circuit and / or the cooling water heating vaporization circuit according to the temperature of the tail gas output by the tail gas heating vaporization circuit.

[0021] In a third aspect, the present application provides the following technical solutions in an embodiment of the present application.

[0022] A vehicle, characterized in comprising a vehicle body and the aftertreatment controller as described in the second aspect.

[0023] The one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0024] The hydrogen internal combustion engine nitrogen oxide emission control method provided by the embodiments of the present application can obtain the cooling water temperature of the hydrogen internal combustion engine when the hydrogen internal combustion engine is cold started, control the cooling water heating vaporization circuit to be disconnected from the cooling water pipeline of the hydrogen internal combustion engine when the cooling water temperature of the engine is detected to be low, and control the liquid hydrogen in the external liquid hydrogen tank to enter the tail gas heating vaporization circuit, so that the liquid hydrogen is vaporized by using the heat of the tail gas. The liquid hydrogen vaporization effect is better, and the tail gas temperature is reduced. The problem of insufficient liquid hydrogen vaporization when the engine cooling water heats the vaporized liquid hydrogen can be effectively solved, and the liquid hydrogen vaporization heat absorption leading to a sharp drop in the engine cooling water temperature can be avoided. The method can improve the engine economy of the vehicle and improve the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 The flowchart of the hydrogen internal combustion engine nitrogen oxide emission control method in the embodiments of the present application;

[0027] Figure 2 The schematic diagram of the hydrogen internal combustion engine nitrogen oxide emission control device in the embodiments of the present application;

[0028] Figure 3 The schematic diagram of the relationship curve in the embodiments of the present application;

[0029] Figure 4 The comparative schematic diagram of the relationship curve in the embodiments of the present application;

[0030] Figure 5 The control flow schematic diagram in the embodiments of the present application;

[0031] Figure 6 The structure schematic diagram of the aftertreatment controller in the embodiments of the present application;

[0032] Figure 7 The structure schematic diagram of the vehicle in the embodiments of the present application. DETAILED DESCRIPTION

[0033] The inventor has found through research that in the prior art, liquid hydrogen is usually heated and vaporized by engine cooling water, and there is not enough engine cooling water, especially when the engine is cold started, the cooling water temperature is low, the liquid hydrogen vaporization is insufficient, and the gas-liquid mixing phenomenon affects combustion. Liquid hydrogen vaporization absorbs a large amount of heat, which also causes the engine cooling water temperature to drop sharply, affecting the engine economy.

[0034] Therefore, the embodiments of the present application provide a hydrogen internal combustion engine nitrogen oxide emission control method, a controller and a vehicle, by controlling the connection and disconnection of the tail gas heating and vaporizing circuit and the cooling water heating and vaporizing circuit, the problem of insufficient liquid hydrogen vaporization when the engine cooling water heats and vaporizes liquid hydrogen is solved, and the engine cooling water temperature is prevented from dropping sharply due to a large amount of heat absorption during liquid hydrogen vaporization, thereby improving the engine economy of the vehicle and greatly improving the user experience.

[0035] The technical scheme of the embodiments of the present application is to solve the above technical problems, and the general idea is as follows:

[0036] A hydrogen internal combustion engine nitrogen oxide emission control method is applied to a post-processing controller in a hydrogen internal combustion engine nitrogen oxide emission control device, the device further includes a hydrogen internal combustion engine, a tail gas heating and vaporizing circuit and a cooling water heating and vaporizing circuit, the tail gas heating and vaporizing circuit is in communication with a tail gas pipeline of the hydrogen internal combustion engine, and the method includes: when the hydrogen internal combustion engine is cold started, the temperature of the cooling water of the hydrogen internal combustion engine is obtained; if the cooling water temperature is lower than a first preset temperature, the cooling water heating and vaporizing circuit is disconnected from the cooling water pipeline of the hydrogen internal combustion engine, and the liquid hydrogen in an external liquid hydrogen tank is controlled to enter the tail gas heating and vaporizing circuit to occur vaporization, so as to reduce the temperature of the tail gas in the tail gas heating and vaporizing circuit; if the cooling water temperature reaches the first preset temperature, the temperature of the tail gas output by the tail gas heating and vaporizing circuit is obtained; according to the temperature of the tail gas output by the tail gas heating and vaporizing circuit, the cooling water heating and vaporizing circuit is controlled to be disconnected or connected with the cooling water pipeline of the hydrogen internal combustion engine, and the liquid hydrogen in the external liquid hydrogen tank is controlled to enter the tail gas heating and vaporizing circuit and / or the cooling water heating and vaporizing circuit.

[0037] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings in the specification and specific embodiments.

[0038] In a first aspect, the hydrogen internal combustion engine NOx emission control method is applied to a post-processing controller in a hydrogen internal combustion engine NOx emission control device, the device further comprising a hydrogen internal combustion engine, an exhaust gas heating vaporization circuit, and a cooling water heating vaporization circuit, the exhaust gas heating vaporization circuit being in communication with an exhaust pipe of the hydrogen internal combustion engine. Specifically, as shown in FIG. 1, the method comprises the following steps S101-S104: Figure 1

[0039] In step S101, the cooling water temperature of the hydrogen internal combustion engine is obtained when the hydrogen internal combustion engine is cold started.

[0040] In step S102, if the cooling water temperature is lower than a first preset temperature, the cooling water heating vaporization circuit is disconnected from the cooling water pipe of the hydrogen internal combustion engine, and liquid hydrogen in an external liquid hydrogen tank is introduced into the exhaust gas heating vaporization circuit to cause vaporization in the exhaust gas heating vaporization circuit to reduce the exhaust gas temperature in the exhaust gas heating vaporization circuit.

[0041] In step S103, the temperature of the exhaust gas output by the exhaust gas heating vaporization circuit is obtained when the cooling water temperature reaches the first preset temperature.

[0042] In step S104, according to the temperature of the exhaust gas output by the exhaust gas heating vaporization circuit, the cooling water heating vaporization circuit is controlled to be disconnected or connected to the cooling water pipe of the hydrogen internal combustion engine, and liquid hydrogen in the external liquid hydrogen tank is controlled to be introduced into the exhaust gas heating vaporization circuit and / or the cooling water heating vaporization circuit.

[0043] The exhaust gas heating vaporization circuit and the cooling water heating vaporization circuit are both used to communicate with the hydrogen internal combustion engine, the output end of the exhaust gas heating vaporization circuit is provided with a temperature detector, the temperature detector is electrically connected to the post-processing controller, and is used to monitor the temperature of the exhaust gas flowing into the exhaust treatment circuit. Optionally, the temperature detector can be a temperature sensor, a temperature detector, etc.

[0044] In this application, the post-processing controller is electrically connected to the electronic control unit of the hydrogen internal combustion engine, and is used to obtain the temperature of the cooling water of the hydrogen internal combustion engine in real time. When the engine is cold started, the cooling water temperature is lower than a first preset temperature c ℃, which can be between 70-100 ℃, and the specific value can be determined according to the influence on the cold start of the engine. Then the post-processing controller disconnects the cooling water heating vaporization circuit and connects the exhaust gas heating vaporization circuit.

[0045] ​In the implementation process, the hydrogen internal combustion engine nitrogen oxide emission control device can further include an exhaust treatment loop, the exhaust treatment loop including a catalyst reducer internally provided with a reduction catalyst, the catalyst reducer being in communication with an output end of the exhaust heating vaporization loop. According to the temperature of the exhaust gas output by the exhaust heating vaporization loop, the cooling water heating vaporization loop is controlled to be disconnected or communicated with the cooling water pipeline of the hydrogen internal combustion engine, and the liquid hydrogen in the external liquid hydrogen tank is controlled to enter the exhaust heating vaporization loop and / or the cooling water heating vaporization loop, which can include:

[0046] The first switching temperature and the second switching temperature of the reduction catalyst are obtained, wherein the first switching temperature and the second switching temperature are determined based on a conversion efficiency-temperature relationship curve of the reduction catalyst, the first switching temperature is less than the second switching temperature; based on the first switching temperature, the second switching temperature, and a preset concentration value, a first target temperature and a second target temperature are determined, wherein the first target temperature is less than or equal to the first switching temperature, and the second target temperature is greater than or equal to the second switching temperature; based on the first switching temperature, the second switching temperature, the first target temperature, the second target temperature, and the exhaust gas temperature, the cooling water heating vaporization loop is controlled to be disconnected or communicated with the cooling water pipeline of the hydrogen internal combustion engine, and the liquid hydrogen in the external liquid hydrogen tank is controlled to enter the exhaust heating vaporization loop and / or the cooling water heating vaporization loop.

[0047] Preferably, the reduction catalyst in the present application can be an H2-SCR catalyst. As shown in Figure 2 The exhaust treatment loop can include an H2-SCR catalyst 101 (hydrogen selective catalytic reduction catalyst), the H2-SCR catalyst 101 being in communication with an output end of the exhaust heating vaporization loop.

[0048] In an embodiment, the first switching temperature and the second switching temperature of the H2-SCR catalyst 101 can include: obtaining a conversion efficiency-temperature relationship curve of the H2-SCR catalyst 101, the relationship curve being obtained by temperature verification test of the H2-SCR catalyst 101, the abscissa of the relationship curve being temperature, and the ordinate being conversion efficiency; according to the relationship curve, a low-temperature nitrogen oxide conversion efficiency inflection point and a high-temperature nitrogen oxide conversion efficiency inflection point of the H2-SCR catalyst 101 are determined; the first switching temperature is determined according to the low-temperature nitrogen oxide conversion efficiency inflection point, and the second switching temperature is determined according to the high-temperature nitrogen oxide conversion efficiency inflection point.

[0049] As shown in Figure 3As shown, the relationship curve is a schematic diagram, by using the common operating points of the internal combustion engine, the temperature verification test is carried out, the conversion efficiency and temperature relationship curve is obtained, and the low temperature NOx conversion efficiency inflection point and the high temperature NOx conversion efficiency inflection point are selected, wherein the low temperature NOx conversion efficiency inflection point can be the first point of the change of the curve slope, and the high temperature NOx conversion efficiency inflection point is the second point of the change of the curve slope, the low temperature NOx conversion efficiency inflection point is taken as the first switching temperature a0, and the high temperature NOx conversion efficiency inflection point is taken as the second switching temperature b0.

[0050] Compared with the catalyst used in the prior art (such as NH3-SCR), the H2-SCR catalyst 101 can not fully hydrolyze the reductant urea aqueous solution to produce NH3 gas below 180°C, and urea crystallization is prone to occur. In addition, the conversion efficiency of the catalyst is low at low temperature. The H2-SCR catalyst 101 can achieve a certain conversion efficiency at a relatively low temperature. As shown in the figure, Figure 4 As shown, the H2-SCR catalyst 101 can avoid the condition that the conversion efficiency is relatively low at a relatively low temperature (≤X℃, X value is between 0-150℃), that is, Figure 4 As shown in the figure, the relationship curve of the two catalysts is compared.

[0051] In the present application, based on the first switching temperature, the second switching temperature and the preset concentration value, the first target temperature and the second target temperature are determined, which can include: based on the first switching temperature and the second switching temperature, performing the following temperature correction step: reducing the first switching temperature by a preset step size and increasing the second switching temperature by a preset step size to obtain the adjusted first switching temperature and the second switching temperature; judging whether the H2-SCR catalyst 101 based on the adjusted first switching temperature and the second switching temperature can make the exhaust emission concentration of the catalyst reducer output end within the preset concentration value after treating the exhaust, if not, the temperature correction step is repeatedly executed based on the adjusted first switching temperature and the second switching temperature until the exhaust emission concentration of the catalyst reducer output end is within the preset concentration value. The preset concentration value is determined according to the emission limit value requirement, and the preset step size can be between 1-3℃.

[0052] Specifically, as shown in the figure, Figure 3 As shown, the first switching temperature is reduced by a preset step size, and the second switching temperature is increased by a preset step size to obtain the low temperature switching temperature a value and the high temperature switching temperature b of the H2-SCR efficiency, and the a0℃-b0℃ interval is increased, so that the effective processing interval of the H2-SCR catalyst 101 is increased, and the exhaust NOx better meets the emission limit value requirement.

[0053] It should be noted that H2-SCR has high conversion efficiency in the low and medium temperature range of 100-300°C, but in the high temperature range, the reaction activity under the condition of oxygen enrichment is relatively low. The competitive reaction of hydrogen and oxygen inhibits the effect of selective catalytic reduction of nitrogen oxides by hydrogen, so that the effect of H2-SCR is not as expected. The exhaust gas temperature of the hydrogen internal combustion engine is higher than 300°C under medium and high load, so H2-SCR cannot meet the application requirements of the hydrogen internal combustion engine under all operating conditions. In order to solve this problem, the present application uses the first switching temperature, the second switching temperature, the first target temperature, the second target temperature, and the exhaust gas temperature to control the cooling water heating vaporization circuit and the cooling water pipeline of the hydrogen internal combustion engine 103 to be disconnected or connected, and to control the way that the liquid hydrogen in the external liquid hydrogen tank 112 enters the exhaust gas heating vaporization circuit and / or the cooling water heating vaporization circuit, so that the exhaust gas temperature input into the H2-SCR catalyst 101 can be kept in a high-efficiency range.

[0054] In specific embodiments, the control of the cooling water heating vaporization circuit and the cooling water pipeline of the hydrogen internal combustion engine 103 to be disconnected or connected, and the control of the way that the liquid hydrogen in the external liquid hydrogen tank 112 enters the exhaust gas heating vaporization circuit and / or the cooling water heating vaporization circuit based on the first switching temperature, the second switching temperature, the first target temperature, the second target temperature, and the exhaust gas temperature can include: if the exhaust gas temperature is lower than the first target temperature a°C or between the first target temperature a°C and the first switching temperature a0°C, the cooling water heating vaporization circuit and the cooling water pipeline of the hydrogen internal combustion engine 103 are connected, and the liquid hydrogen in the external liquid hydrogen tank 112 is controlled to enter the cooling water heating vaporization circuit, so that the liquid hydrogen input into the circuit is vaporized based on the hydrogen internal combustion engine 103 cooling water, and the exhaust gas heating vaporization circuit is directly used for transmitting the exhaust gas of the hydrogen internal combustion engine 103; if the exhaust gas temperature is between the first switching temperature a0°C and the second switching temperature b0°C, the cooling water heating vaporization circuit and the cooling water pipeline of the hydrogen internal combustion engine 103 are disconnected or connected, and the liquid hydrogen in the external liquid hydrogen tank 112 is controlled to enter the exhaust gas heating vaporization circuit and the cooling water heating vaporization circuit; if the exhaust gas temperature is greater than the second target temperature b°C, the cooling water heating vaporization circuit and the cooling water pipeline of the hydrogen internal combustion engine 103 are disconnected, and the liquid hydrogen in the external liquid hydrogen tank 112 is controlled to enter the exhaust gas heating vaporization circuit.

[0055] In specific embodiments, the tail gas heating vaporization circuit can include a first vaporizer 105 and a hydrogen distribution proportional valve 106 connected in series, an input end of the hydrogen distribution proportional valve 106 being connected to an external liquid hydrogen tank 112, a first output end of the hydrogen distribution proportional valve 106 being connected to a liquid hydrogen input port of the first vaporizer 105 through a pipeline, a hydrogen gas output port of the first vaporizer 105 being connected to a hydrogen gas input port of the hydrogen internal combustion engine 103, and the aftertreatment controller 102 being electrically connected to a control end of the hydrogen distribution proportional valve 106; controlling the liquid hydrogen in the external liquid hydrogen tank 112 to enter the tail gas heating vaporization circuit includes: controlling the first output end of the hydrogen distribution proportional valve 106 to be closed, so that the liquid hydrogen in the external liquid hydrogen tank 112 enters the first vaporizer 105 from the hydrogen distribution proportional valve 106.

[0056] Specifically, the cooling water heating vaporization circuit can include a second vaporizer 107 and a cooling water control valve 108 connected in series, a second output end of the hydrogen distribution proportional valve 106 being connected to a liquid hydrogen input port of the second vaporizer 107 through a pipeline, a hydrogen gas output port of the second vaporizer 107 being connected to a hydrogen gas input port of the hydrogen internal combustion engine 103, and the aftertreatment controller 102 being electrically connected to a control end of the cooling water control valve 108; controlling the cooling water heating vaporization circuit to be disconnected or connected to the cooling water pipeline of the hydrogen internal combustion engine 103 includes: controlling the cooling water control valve 108 to be disconnected or connected; controlling the liquid hydrogen in the external liquid hydrogen tank 112 to enter the cooling water heating vaporization circuit includes: controlling the second output end of the hydrogen distribution proportional valve 106 to be closed, so that the liquid hydrogen in the external liquid hydrogen tank 112 enters the second vaporizer 107 from the hydrogen distribution proportional valve 106.

[0057] Specifically, as shown in FIG. 1, Figure 2 Specifically, as shown in FIG. 1,

[0058] The tail gas output port of the hydrogen internal combustion engine 103 is communicated with the first vaporizer 105 and the input end of the tail gas treatment circuit through the cooling water pipe, for transferring the residual heat of the tail gas to the first vaporizer 105; the input end of the hydrogen distribution proportional valve 106 is connected with the liquid hydrogen tank 112 through the liquid hydrogen pipe, the first output end of the hydrogen distribution proportional valve 106 is communicated with the liquid hydrogen input port of the first vaporizer 105 through the liquid hydrogen pipe, the hydrogen gas output port of the first vaporizer 105 is communicated with the hydrogen gas input port of the hydrogen internal combustion engine 103 through the gaseous hydrogen pipe, for flowing the liquid hydrogen into the hydrogen internal combustion engine 103 after being heated and vaporized in the first vaporizer 105, the second output end of the hydrogen distribution proportional valve 106 is communicated with the liquid hydrogen input port of the cooling water heating vaporization circuit through the liquid hydrogen pipe, for flowing the liquid hydrogen into the hydrogen internal combustion engine 103 after being heated and vaporized in the cooling water heating vaporization circuit.

[0059] The cooling water heating vaporization circuit can include the second vaporizer 107 and the cooling water control valve 108, the post-processing controller 102 is electrically connected with the cooling water control valve 108; the cooling water output port of the hydrogen internal combustion engine 103 is communicated with the second vaporizer 107 through the cooling water control valve 108 and the second vaporizer 107, and then flows back to the hydrogen internal combustion engine 103, for transferring heat to the second vaporizer 107. The second output end of the hydrogen distribution proportional valve 106 is communicated with the liquid hydrogen input port of the second vaporizer 107, the hydrogen gas output port of the second vaporizer 107 is communicated with the hydrogen gas input port of the hydrogen internal combustion engine 103 through the gaseous hydrogen pipe, for heating and vaporizing the liquid hydrogen flowing into the second vaporizer 107, and the hydrogen gas obtained by vaporization flows to the hydrogen internal combustion engine 103.

[0060] Further, in order to realize more flexible adjustment of the exhaust NOX concentration, the tail gas heating vaporization circuit can further include a post-processing hydrogen nozzle 109 electrically connected with the post-processing controller 102, the post-processing hydrogen nozzle 109 is arranged between the hydrogen internal combustion engine 103 and the tail gas input port of the first vaporizer 105, the post-processing hydrogen nozzle 109 is communicated with the hydrogen gas output port of the first vaporizer 105, after obtaining the first switching temperature, the second switching temperature, the first target temperature, the second target temperature and the tail gas temperature, the method can further include:

[0061] If the tail gas temperature is lower than the first target temperature a℃, the post-processing hydrogen nozzle 109 is closed; if the tail gas temperature is between the first target temperature a℃ and the first switching temperature a0℃, the post-processing hydrogen nozzle 109 is opened; if the tail gas temperature is between the first switching temperature a0℃ and the second switching temperature b0℃, the post-processing hydrogen nozzle 109 is opened; if the tail gas temperature is greater than the second target temperature b℃, the post-processing hydrogen nozzle 109 is opened.

[0062] The post-processing hydrogen nozzle 109 is used to reduce nitrogen oxides (NOx) in the exhaust gas by spraying hydrogen, thereby reducing NOx emissions.

[0063] Further, the post-processing hydrogen nozzle 109 is also in communication with the hydrogen output end of the second vaporizer 107, so that part of the hydrogen in the second vaporizer 107 flows into the exhaust gas heating vaporization circuit through the post-processing hydrogen nozzle 109, thereby increasing the hydrogen injection amount.

[0064] Further, in order to obtain the NOX concentration of the exhaust gas, the exhaust gas treatment circuit can further include a first nitrogen oxide sensor 110 (i.e., a post-NOX sensor) arranged at the output end of the H2-SCR catalyst 101, and the first nitrogen oxide sensor 110 is electrically connected to the post-processing controller 102. The method further includes: obtaining the nitrogen oxide concentration detected by the first nitrogen oxide sensor 110 (i.e., the output of the catalyst reducer); and increasing the injection amount of the post-processing hydrogen nozzle 109 if the nitrogen oxide concentration is greater than a preset concentration value. In this way, the post-processing hydrogen nozzle 109 can dynamically adjust the hydrogen injection amount according to different combustion conditions, so as to optimize the NOx emission reduction effect.

[0065] In a specific embodiment, the exhaust gas heating vaporization circuit can further include a second nitrogen oxide sensor 111 (i.e., a pre-NOX sensor) electrically connected to the post-processing controller 102, and the second nitrogen oxide sensor 111 is arranged between the exhaust gas output end of the hydrogen internal combustion engine 103 and the exhaust gas input port of the first vaporizer 105, and is used to monitor the nitrogen oxide concentration of the exhaust gas.

[0066] In one embodiment, the injection amount of the post-processing hydrogen nozzle 109 is first determined based on the nitrogen oxide concentrations detected by the pre-NOX sensor and the post-NOX sensor, and then the injection amount of the post-processing hydrogen nozzle 109 is corrected based on the nitrogen oxide concentration of the exhaust gas detected by the post-NOX sensor, so that the NOX of the exhaust gas is always within the preset concentration value.

[0067] Specifically, as shown in FIG. 1, the exhaust gas treatment circuit can further include a first vaporizer 105 arranged at the exhaust gas output end of the hydrogen internal combustion engine 103, and the first vaporizer 105 is in communication with the exhaust gas output end of the hydrogen internal combustion engine 103 and the hydrogen input end of the second vaporizer 107. Figure 5As shown, when the engine is cold started, if the cooling water temperature is lower than the first preset temperature c ℃, the cooling water control valve 108 is controlled to be closed, so that the cooling water pipeline to the second vaporizer 107 is closed, the first output end of the hydrogen distribution proportional valve 106 is closed, so that the liquid hydrogen passes through the hydrogen distribution proportional valve 106 into the first vaporizer 105, and the liquid hydrogen is heated and vaporized in the first vaporizer 105 by the exhaust gas of the hydrogen internal combustion engine 103. The hydrogen after vaporization flows into the hydrogen internal combustion engine 103, so that the second vaporizer 107 replaces the working of the first vaporizer 105, which can reduce the heat loss of the engine cooling water when the first vaporizer 105 works, avoid the heat absorption of the engine cooling water, cause the slow rise of the engine cooling water temperature, and affect the engine starting and lubrication performance. At this time, the aftertreatment efficiency is too low, the aftertreatment hydrogen nozzle 109 is closed, and the injection of aftertreatment H2 is not performed.

[0068] When the engine cooling water temperature rises to the normal level (i.e. reaches the first preset temperature c ℃), the exhaust gas temperature detected by the temperature detector 104 is obtained, if the exhaust gas temperature is lower than the first target temperature a ℃, the cooling water control valve 108 is controlled to be connected, and the second output end of the hydrogen distribution proportional valve 106 is closed, so that the cooling water flows through the second vaporizer 107, and the liquid hydrogen flows into the first vaporizer 105. The liquid hydrogen is vaporized in the second vaporizer 107 by the cooling water. At this time, since the first vaporizer 105 is in a non-working state, the exhaust gas directly flows to the exhaust gas treatment circuit through the first vaporizer 105, so that the exhaust gas temperature rises rapidly, and the aftertreatment conversion efficiency requirement is met.

[0069] At this time, the aftertreatment efficiency is too low, that is, Figure 3 As shown, the exhaust gas temperature is lower than a ℃, the H2-SCR catalyst 101 is in a low efficiency working state, the aftertreatment hydrogen nozzle 109 is closed, and the injection of aftertreatment H2 is not performed.

[0070] If the exhaust gas temperature is between the first target temperature a ℃ and the first switching temperature a0 ℃, the cooling water control valve 108 is controlled to be connected, and the second output end of the hydrogen distribution proportional valve 106 is closed, so that the cooling water flows through the second vaporizer 107, and the liquid hydrogen is vaporized through the second vaporizer 107, so that the exhaust gas temperature continues to rise. At this time, as shown, Figure 2 As shown, the exhaust gas temperature is between a ℃ and a0 ℃, the H2-SCR catalyst 101 is in a high efficiency working state, the aftertreatment hydrogen nozzle 109 is opened, and the hydrogen injection is closed loop controlled according to the front and rear NOX sensors to purify the NOX pollutants.

[0071] If the exhaust gas temperature is between the first switching temperature a0℃ and the second switching temperature b0℃, or the exhaust gas temperature is between the first target temperature b0℃ and the first switching temperature b0℃, the hydrogen distribution proportional valve 106 is controlled to be closed or connected, and the liquid hydrogen in the external liquid hydrogen tank 112 is controlled to enter the exhaust gas heating vaporization circuit and the cooling water heating vaporization circuit, that is, the distribution proportion of the hydrogen distribution proportional valve 106 and the opening and closing of the cooling water control valve 108 are controlled, so that the liquid hydrogen is reasonably distributed between the first vaporizer 105 and the second vaporizer 107, the exhaust gas temperature can be maintained between a0 and b0, the exhaust gas temperature reaching the H2-SCR catalyst 101 can be continuously maintained in the preferred temperature range, and the H2-SCR can better meet the application in the full working condition of the hydrogen internal combustion engine. At this time, the H2-SCR catalyst 101 is in a high-efficiency working state, and the aftertreatment hydrogen nozzle 109 is opened, and the hydrogen injection is closed-loop controlled according to the front and rear NOX sensors to purify the NOX pollutants.

[0072] For example, the control of the hydrogen distribution proportional valve 106 and the cooling water control valve 108 to reasonably distribute the liquid hydrogen between the first vaporizer 105 and the second vaporizer 107 can be that when the exhaust gas temperature is close to the upper limit of a0℃ to b0℃, the first output end of the hydrogen distribution proportional valve 106 is controlled to be closed (that is, the proportion of the first output end of the hydrogen distribution proportional valve 106 is 100%, and the proportion of the second output end is 0%), and the cooling water control valve 108 is controlled to be opened to reduce the exhaust gas temperature; when the exhaust gas temperature is close to the lower limit of a0℃ to b0℃, the second output end of the hydrogen distribution proportional valve 106 is controlled to be closed (that is, the proportion of the first output end of the hydrogen distribution proportional valve 106 is 0%, and the proportion of the second output end is 100%), and the cooling water control valve 108 is controlled to be closed to keep the exhaust gas temperature rising; and when the exhaust gas temperature is in the middle zone of a0℃ to b0℃, the proportion of the first output end of the hydrogen distribution proportional valve 106 is 50%, the proportion of the second output end is 50%, and the cooling water control valve 108 is controlled to be closed.

[0073] If the exhaust gas temperature is greater than the second target temperature b0℃, the cooling water control valve 108 is controlled to be opened, and the first output end of the hydrogen distribution proportional valve 106 is controlled to be closed, so that the liquid hydrogen is completely liquefied in the exhaust gas first vaporizer 105, the exhaust gas temperature is reduced through the heat absorption of the liquid hydrogen vaporization, and the requirement of the H2-SCR conversion efficiency is met. At this time, as shown in FIG. 6, the aftertreatment hydrogen nozzle 109 is opened, and the hydrogen injection is closed-loop controlled according to the front and rear NOX sensors to purify the NOX pollutants. Figure 3

[0074] ​The method can better solve the problem that the H2-SCR cannot meet the application requirement of the hydrogen internal combustion engine in all working conditions by keeping the tail gas temperature input into the H2-SCR in a high-efficiency interval; the hydrogen internal combustion engine hydrogen injection system and the H2-SCR replace the NH3-SCR, the NH3-SCR urea injection system is reduced, the system complexity and cost are reduced, the low-temperature conversion efficiency of the NH3-SCR is low, and the crystallization problem is solved; the problem of insufficient liquid hydrogen vaporization caused by heating the liquid hydrogen by the cooling water of the hydrogen engine is avoided, the engine cooling water temperature is sharply reduced due to the large heat absorption of the liquid hydrogen vaporization, the engine economy is affected, the influence of the hydrogen vaporization heat absorption on the cooling water vaporizer and the engine performance is reduced by the tail gas heating vaporizer, and the system reliability is improved; when the tail gas is in a high-temperature state, the first vaporizer absorbs the heat of the tail gas to reduce the exhaust temperature, so that the H2-SCR can cover all engine operating conditions, the first vaporizer is used to reduce the influence of the hydrogen vaporization heat absorption on the cooling water vaporizer and the engine performance, and the system reliability is improved.

[0075] In summary, by means of the hydrogen internal combustion engine nitrogen oxide emission control method provided by the embodiment of the application, the communication and disconnection control of the tail gas heating vaporization circuit and the cooling water heating vaporization circuit can solve the problem of insufficient liquid hydrogen vaporization caused by heating the liquid hydrogen by the cooling water of the engine, avoid the problem that the engine cooling water temperature is sharply reduced due to the large heat absorption of the liquid hydrogen vaporization, and further improve the vehicle engine economy and greatly improve the user experience.

[0076] In a second aspect, based on the same inventive concept, the embodiment provides a post-processing controller, as shown in the accompanying drawings, comprising: Figure 6 as shown in the accompanying drawings, comprising:

[0077] The first acquisition module 401 is configured to acquire the cooling water temperature of the hydrogen internal combustion engine when the hydrogen internal combustion engine is cold started.

[0078] The first control module 402 is configured to, if the cooling water temperature is lower than a first preset temperature, disconnect the cooling water heating vaporization circuit from the cooling water pipeline of the hydrogen internal combustion engine, and control the liquid hydrogen in the external liquid hydrogen tank to enter the tail gas heating vaporization circuit to be vaporized in the tail gas heating vaporization circuit, so as to reduce the temperature of the tail gas in the tail gas heating vaporization circuit.

[0079] The second acquisition module 403 is configured to, if the cooling water temperature reaches the first preset temperature, acquire the temperature of the tail gas output by the tail gas heating vaporization circuit.

[0080] The second control module 404 is configured to control the cooling water heating vaporization circuit to be disconnected from or connected to the cooling water pipeline of the hydrogen internal combustion engine and control the liquid hydrogen in the external liquid hydrogen tank to enter the tail gas heating vaporization circuit and / or the cooling water heating vaporization circuit according to the temperature of the tail gas output by the tail gas heating vaporization circuit.

[0081] As an optional embodiment, the second control module 404 comprises:

[0082] A first acquisition sub-module is configured to acquire a first switching temperature and a second switching temperature of the reduction catalyst, wherein the first switching temperature and the second switching temperature are determined based on a conversion efficiency-temperature curve of the reduction catalyst, and the first switching temperature is less than the second switching temperature.

[0083] A first determination sub-module is configured to determine a first target temperature and a second target temperature based on the first switching temperature, the second switching temperature and a preset concentration value, wherein the first target temperature is less than or equal to the first switching temperature, and the second target temperature is greater than or equal to the second switching temperature.

[0084] A first control sub-module is configured to control the cooling water heating vaporization circuit to be disconnected from or connected to the cooling water pipeline of the hydrogen internal combustion engine and control the liquid hydrogen in the external liquid hydrogen tank to enter the tail gas heating vaporization circuit and / or the cooling water heating vaporization circuit based on the first switching temperature, the second switching temperature, the first target temperature, the second target temperature and the temperature of the tail gas.

[0085] As an optional embodiment, the reduction catalyst is an H2-SCR catalyst.

[0086] As an optional embodiment, the first acquisition sub-module is specifically configured to acquire a conversion efficiency-temperature curve of the H2-SCR catalyst, the conversion efficiency-temperature curve is obtained by performing a temperature verification test on the H2-SCR catalyst, the abscissa of the conversion efficiency-temperature curve is temperature, and the ordinate of the conversion efficiency-temperature curve is conversion efficiency; determine a low-temperature nitrogen oxide conversion efficiency inflection point and a high-temperature nitrogen oxide conversion efficiency inflection point of the H2-SCR catalyst according to the conversion efficiency-temperature curve; determine the first switching temperature according to the low-temperature nitrogen oxide conversion efficiency inflection point, and determine the second switching temperature according to the high-temperature nitrogen oxide conversion efficiency inflection point.

[0087] As an optional embodiment, the first determination sub-module is specifically configured to:

[0088] Based on the first switching temperature and the second switching temperature, a temperature correction step is performed: the first switching temperature is reduced by a preset step size, and the second switching temperature is increased by a preset step size, to obtain an adjusted first switching temperature and an adjusted second switching temperature; it is judged whether the H2-SCR catalyst based on the adjusted first switching temperature and the adjusted second switching temperature meets the preset concentration value of the exhaust emission concentration at the output end of the catalyst reducer after the exhaust treatment, and if not, the temperature correction step is repeatedly performed based on the adjusted first switching temperature and the adjusted second switching temperature until the exhaust emission concentration at the output end of the catalyst reducer is within the preset concentration value.

[0089] As an optional embodiment, the first control submodule is specifically configured to: if the exhaust temperature is lower than the first target temperature or is between the first target temperature and the first switching temperature, control the cooling water heating and vaporization circuit to be in communication with the cooling water pipeline of the hydrogen internal combustion engine, and control the liquid hydrogen in the external liquid hydrogen tank to enter the cooling water heating and vaporization circuit; if the exhaust temperature is between the first switching temperature and the second switching temperature, control the cooling water heating and vaporization circuit to be disconnected or in communication with the cooling water pipeline of the hydrogen internal combustion engine, and control the liquid hydrogen in the external liquid hydrogen tank to enter the exhaust heating and vaporization circuit and the cooling water heating and vaporization circuit; and if the exhaust temperature is greater than the second target temperature, control the cooling water heating and vaporization circuit to be disconnected with the cooling water pipeline of the hydrogen internal combustion engine, and control the liquid hydrogen in the external liquid hydrogen tank to enter the exhaust heating and vaporization circuit.

[0090] As an optional embodiment, the first control submodule is specifically configured to: control the first output end of the hydrogen distribution proportional valve to be closed, so that the liquid hydrogen in the external liquid hydrogen tank enters the first vaporizer from the hydrogen distribution proportional valve.

[0091] As an optional embodiment, the first control submodule is specifically configured to: control the cooling water control valve to be disconnected or in communication; and control the second output end of the hydrogen distribution proportional valve to be closed, so that the liquid hydrogen in the external liquid hydrogen tank enters the second vaporizer from the hydrogen distribution proportional valve.

[0092] The above modules can be implemented by software code, at which time the above modules can be stored in the memory of the control device. The above modules can also be implemented by hardware such as an integrated circuit chip.

[0093] The implementation principle and the technical effects of the post-processing controller provided by the embodiment of the application are the same as those of the foregoing method embodiment. For brevity of description, the part of the post-processing controller embodiment not mentioned can refer to the corresponding content in the foregoing method embodiment.

[0094] In a third aspect, based on the same inventive concept, as shown in Figure 7 The embodiment provides a vehicle 500, which comprises a vehicle body 501 and a post-processing controller 502 as described above.

[0095] Those skilled in the art will appreciate that embodiments of the present application can be readily used as software, hardware, or a combination of software and hardware. In a software embodiment, the methods can be tangibly embodied in a machine-readable storage medium having stored thereon instructions that can be used to program a computer to perform any of the methods. The software implementation can be for example, in a modulated data signal such as a carrier wave or other transport mechanism, or a computer readable storage medium.

[0096] The present application is described in reference to the drawings using a flowchart and / or a block diagram of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart and / or block diagram, and combinations of blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks.

[0097] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks.

[0098] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks.

[0099] While preferred embodiments of the application have been described, modifications and variations can be effected to such embodiments by those of ordinary skill in the art once the nature of the

[0100] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A method for controlling nitrogen oxide emissions from a hydrogen internal combustion engine, characterized in that: A post-processing controller for use in a hydrogen internal combustion engine nitrogen oxide emission control device, the device also comprising a hydrogen internal combustion engine, an exhaust gas heating and vaporization circuit, and a cooling water heating and vaporization circuit, the exhaust gas heating and vaporization circuit being in communication with an exhaust gas pipeline of the hydrogen internal combustion engine, the method comprising: When the hydrogen internal combustion engine is cold started, obtaining the cooling water temperature of the hydrogen internal combustion engine; If the cooling water temperature is lower than a first preset temperature, the cooling water heating and vaporization circuit is controlled to be disconnected from the cooling water pipeline of the hydrogen internal combustion engine, and the liquid hydrogen in the external liquid hydrogen tank is controlled to enter the exhaust gas heating and vaporization circuit, and vaporize in the exhaust gas heating and vaporization circuit to reduce the exhaust gas temperature in the exhaust gas heating and vaporization circuit; If the cooling water temperature reaches the first preset temperature, obtaining the temperature of the exhaust gas output by the exhaust gas heating and vaporization circuit; According to the temperature of the exhaust gas output by the exhaust gas heating vaporization circuit, the cooling water heating vaporization circuit is controlled to be disconnected or connected with the cooling water pipeline of the hydrogen internal combustion engine, and the liquid hydrogen in the external liquid hydrogen tank is controlled to enter the exhaust gas heating vaporization circuit and / or the cooling water heating vaporization circuit, including: if the exhaust gas temperature is lower than the first target temperature, the cooling water heating vaporization circuit is controlled to be connected with the cooling water pipeline of the hydrogen internal combustion engine, and the liquid hydrogen in the external liquid hydrogen tank is controlled to enter the cooling water heating vaporization circuit; if the exhaust gas temperature is greater than the second target temperature, the cooling water heating vaporization circuit is controlled to be disconnected from the cooling water pipeline of the hydrogen internal combustion engine, and the liquid hydrogen in the external liquid hydrogen tank is controlled to enter the exhaust gas heating vaporization circuit; the first target temperature is lower than the second target temperature.

2. The method according to claim 1, wherein The device also includes an exhaust gas treatment circuit, the exhaust gas treatment circuit includes a catalyst reducer with a reduction catalyst therein, the catalyst reducer is connected to the output end of the exhaust gas heating and vaporization circuit, and according to the temperature of the exhaust gas output by the exhaust gas heating and vaporization circuit, the cooling water heating and vaporization circuit is controlled to be disconnected or connected with the cooling water pipeline of the hydrogen internal combustion engine, and the liquid hydrogen in the external liquid hydrogen tank is controlled to enter the exhaust gas heating and vaporization circuit and / or the cooling water heating and vaporization circuit, and further includes: Obtaining a first switching temperature and a second switching temperature of the reduction catalyst, wherein the first switching temperature and the second switching temperature are determined based on a curve of a relationship between conversion efficiency and temperature of the reduction catalyst, and the first switching temperature is less than the second switching temperature; Determining the first target temperature and the second target temperature based on the first switching temperature, the second switching temperature, and a preset concentration value, wherein the first target temperature is less than or equal to the first switching temperature, and the second target temperature is greater than or equal to the second switching temperature; If the exhaust gas temperature is between the first target temperature and the first switching temperature, controlling the cooling water heating vaporization circuit to communicate with the cooling water pipeline of the hydrogen internal combustion engine, and controlling the liquid hydrogen in the external liquid hydrogen tank to enter the cooling water heating vaporization circuit; If the exhaust gas temperature is between the first switching temperature and the second switching temperature, the cooling water heating vaporization circuit is controlled to be disconnected or connected with the cooling water pipeline of the hydrogen internal combustion engine, and the liquid hydrogen in the external liquid hydrogen tank is controlled to enter the exhaust gas heating vaporization circuit and the cooling water heating vaporization circuit.

3. The method according to claim 2, wherein The reduction catalyst is a H2-SCR catalyst.

4. The method according to claim 3, wherein The obtaining of the first switching temperature and the second switching temperature of the H2-SCR catalyst includes: Obtaining a relationship curve between the conversion efficiency and temperature of the H2-SCR catalyst, wherein the relationship curve is obtained by performing a temperature verification test on the H2-SCR catalyst, the abscissa of the relationship curve being the temperature and the ordinate being the conversion efficiency; Determining a low-temperature nitrogen oxide conversion efficiency inflection point and a high-temperature nitrogen oxide conversion efficiency inflection point of the H2-SCR catalyst based on the relationship curve; A first switching temperature is determined according to the low-temperature nitrogen oxide conversion efficiency inflection point, and a second switching temperature is determined according to the high-temperature nitrogen oxide conversion efficiency inflection point.

5. The method according to claim 3, wherein The determining of a first target temperature and a second target temperature based on the first switching temperature, the second switching temperature, and a preset concentration value includes: Based on the first switching temperature and the second switching temperature, the following temperature correction step is performed: Decreasing the first switching temperature according to a preset step size, and increasing the second switching temperature according to the preset step size, to obtain adjusted first switching temperature and second switching temperature; Determine whether the exhaust gas emission concentration at the output end of the catalyst reducer is within a preset concentration value after the exhaust gas is treated by the H2-SCR catalyst based on the adjusted first switching temperature and the second switching temperature. If not, repeat the temperature correction step based on the adjusted first switching temperature and the second switching temperature until the exhaust gas emission concentration at the output end of the catalyst reducer is within the preset concentration value.

6. The method according to claim 5, wherein The tail gas heating and vaporization circuit includes a first vaporizer and a hydrogen distribution proportional valve connected to each other, an input end of the hydrogen distribution proportional valve is externally connected to a liquid hydrogen tank, a first output end of the hydrogen distribution proportional valve is connected to a liquid hydrogen input port of the first vaporizer via a pipeline, and the post-processing controller is electrically connected to a control end of the hydrogen distribution proportional valve, and the control of liquid hydrogen in the external liquid hydrogen tank entering the tail gas heating and vaporization circuit includes: The first output end of the hydrogen distribution proportional valve is controlled to be closed, so that the liquid hydrogen in the external liquid hydrogen tank enters the first vaporizer through the hydrogen distribution proportional valve.

7. The method according to claim 6, wherein The cooling water heating and vaporization circuit includes a second vaporizer and a cooling water control valve connected thereto, the second output end of the hydrogen distribution proportional valve is connected to the liquid hydrogen input port of the second vaporizer via a pipeline, the post-processing controller is electrically connected to the control end of the cooling water control valve, and the control of disconnecting or connecting the cooling water pipeline of the hydrogen internal combustion engine to the cooling water heating and vaporization circuit includes: Controlling the disconnection or connection of the cooling water control valve; The controlling of the liquid hydrogen in the external liquid hydrogen tank to enter the cooling water heating vaporization circuit comprises: The second output end of the hydrogen distribution proportional valve is controlled to be closed, so that the liquid hydrogen in the external liquid hydrogen tank enters the second vaporizer through the hydrogen distribution proportional valve.

8. A post-processing controller, characterized in that: include: A first acquisition module is used to obtain the cooling water temperature of the hydrogen internal combustion engine when the hydrogen internal combustion engine is cold started; a first control module, configured to control the cooling water heating and vaporization circuit to be disconnected from the cooling water pipeline of the hydrogen internal combustion engine if the cooling water temperature is lower than a first preset temperature, and control the liquid hydrogen in the external liquid hydrogen tank to enter the exhaust gas heating and vaporization circuit, so as to vaporize in the exhaust gas heating and vaporization circuit, thereby reducing the exhaust gas temperature in the exhaust gas heating and vaporization circuit; a second acquisition module, configured to acquire the temperature of the exhaust gas output by the exhaust gas heating and vaporization circuit if the cooling water temperature reaches the first preset temperature; The second control module is used to control the cooling water heating vaporization circuit to be disconnected or connected with the cooling water pipeline of the hydrogen internal combustion engine according to the temperature of the exhaust gas output by the exhaust gas heating vaporization circuit, and to control the liquid hydrogen in the external liquid hydrogen tank to enter the exhaust gas heating vaporization circuit and / or the cooling water heating vaporization circuit, including: if the exhaust gas temperature is lower than the first target temperature, the cooling water heating vaporization circuit is controlled to be connected with the cooling water pipeline of the hydrogen internal combustion engine, and the liquid hydrogen in the external liquid hydrogen tank is controlled to enter the cooling water heating vaporization circuit; if the exhaust gas temperature is greater than the second target temperature, the cooling water heating vaporization circuit is controlled to be disconnected from the cooling water pipeline of the hydrogen internal combustion engine, and the liquid hydrogen in the external liquid hydrogen tank is controlled to enter the exhaust gas heating vaporization circuit; the first target temperature is lower than the second target temperature.

9. A vehicle, characterized in that: The invention comprises a vehicle body and the post-processing controller according to claim 8.

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