A thermal management system for an engine

Abstract

The application discloses a kind of heat management systems of engine, comprising: exhaust pipe, exhaust treatment device being installed on exhaust pipe, hydrogen supply device being coupled to the exhaust pipe between engine and exhaust treatment device, ammonia supply device being coupled to the outlet side of exhaust treatment device on exhaust pipe, first temperature sensor, second temperature sensor, third temperature sensor, fourth temperature sensor and control device, control device is used to control the exhaust heat of engine to hydrogen supply device and / or ammonia supply device according to the first temperature detected by first temperature sensor, the second temperature detected by second temperature sensor, the third temperature detected by third temperature sensor and the fourth temperature detected by fourth temperature sensor.The above technical scheme can ensure that exhaust heat can be fully utilized to improve the combustion effect of engine, which is beneficial to save the power consumption and energy consumption of engine.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and more particularly to a thermal management system for an engine. Background Technology

[0002] With the development of new technologies, more and more countries have begun to include ammonia as a low-carbon fuel in their energy policies. However, the exhaust gas produced by engines during operation has a certain temperature, and this heat is usually directly released into the atmosphere, which not only raises the atmospheric temperature but is also a waste. Therefore, how to rationally utilize the heat from exhaust gas has become one of the more popular research issues. Summary of the Invention

[0003] This invention provides a thermal management system for an engine, which can ensure that the heat of the exhaust gas can be fully utilized to improve the combustion efficiency of the engine and help save the engine's electricity and energy consumption.

[0004] This invention provides a thermal management system for an engine, comprising:

[0005] An exhaust pipe, connected to the engine exhaust outlet, is used to discharge the exhaust gas produced by the engine;

[0006] An exhaust gas treatment device is installed on the exhaust pipe to treat the exhaust gas;

[0007] A hydrogen supply device, coupled to the exhaust pipe between the engine and the exhaust gas treatment device, is used to generate hydrogen from liquid ammonia using the heat of the engine's exhaust gas and supply it to the engine.

[0008] An ammonia supply device is coupled to the exhaust pipe on the outlet side of the exhaust gas treatment device, and is used to vaporize the liquid ammonia into ammonia gas using the heat of the engine exhaust gas and supply it to the engine.

[0009] A first temperature sensor is installed on the exhaust pipe between the engine and the hydrogen supply device to detect the first temperature of the exhaust gas in real time.

[0010] A second temperature sensor is installed on the exhaust pipe between the hydrogen supply device and the exhaust gas treatment device to detect the second temperature of the exhaust gas in real time.

[0011] A third temperature sensor is installed on the exhaust pipe between the exhaust gas treatment device and the ammonia supply device to detect the third temperature of the exhaust gas in real time.

[0012] A fourth temperature sensor is installed at the outlet end of the exhaust pipe to detect the fourth temperature of the exhaust gas in real time.

[0013] The control device is electrically connected to the first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor, respectively, and is used to control the supply of exhaust heat from the engine to the hydrogen supply device and / or the ammonia supply device based on the first temperature, the second temperature, the third temperature, and the fourth temperature.

[0014] Optionally, the control device is specifically used to determine whether the exhaust gas treatment device has completed heat storage based on the second temperature and the third temperature, and to determine, based on the determination result, that the exhaust gas heat of the engine is preferentially supplied to the ammonia supply device or the hydrogen supply device.

[0015] Optionally, the control device is specifically used to determine whether the first temperature is greater than the first preset threshold when the exhaust gas treatment device has completed heat storage, and to determine, based on the determination result, to preferentially supply the exhaust gas heat of the engine to the ammonia supply device or the hydrogen supply device.

[0016] Optionally, the control device is specifically used to determine that when the first temperature is greater than the first preset threshold, the exhaust heat of the engine is preferentially supplied to the hydrogen supply device.

[0017] Optionally, the engine's thermal management system further includes a first control valve, which is located at the exhaust gas heat inlet of the hydrogen supply device.

[0018] The control device is electrically connected to the first control valve and is used to obtain the hydrogen production power of the hydrogen supply device after determining that the exhaust heat of the engine is preferentially supplied to the hydrogen supply device, and control the opening degree of the first control valve according to the hydrogen production power to adjust the amount of exhaust heat supplied to the hydrogen supply device.

[0019] Optionally, the control device is specifically used to control the opening degree of the first control valve to the maximum opening degree value when it is determined that the hydrogen production power is not equal to zero and the fourth temperature is greater than the second preset threshold.

[0020] The second preset threshold is the lowest temperature value of the exhaust pipe.

[0021] Optionally, the control device is specifically used to control the opening degree of the first control valve to 20% of the maximum opening degree when it is determined that the hydrogen production power is equal to zero, so as to preheat the hydrogen supply device.

[0022] Optionally, the engine's thermal management system further includes a second control valve, which is located at the exhaust heat inlet of the ammonia supply device;

[0023] The control device is electrically connected to the second control valve and is used to determine whether the fourth temperature is greater than the third preset threshold after controlling the opening of the first control valve according to the hydrogen production power to adjust the amount of heat of the exhaust gas supplied to the hydrogen supply device, and to control the second control valve to open when it is determined that the fourth temperature is greater than the third preset threshold.

[0024] Optionally, the control device is used to determine that when the first temperature is less than or equal to the first preset threshold, the exhaust heat of the engine is preferentially supplied to the ammonia supply device.

[0025] Optionally, the engine's thermal management system further includes a second control valve, which is located at the exhaust heat inlet of the ammonia supply device;

[0026] The control device is electrically connected to the second control valve and is specifically used to determine whether the fourth temperature is greater than the third preset threshold, and when the fourth temperature is determined to be greater than the third preset threshold, control the second control valve to open.

[0027] Optionally, the engine's thermal management system further includes a first control valve, which is located at the exhaust gas heat inlet of the hydrogen supply device.

[0028] The control device is electrically connected to the first control valve and is used to obtain the ammonia vaporization power of the ammonia supply device after controlling the second control valve to open, determine whether the ammonia vaporization power reaches the ammonia vaporization target power value, and control the opening or closing of the first control valve according to the determination result.

[0029] Optionally, the control device is specifically used to control the first control valve to open when it is determined that the ammonia vaporization power reaches the ammonia vaporization target power value and the fourth temperature is greater than the second preset threshold, and the opening degree of the first control valve is 20% of the maximum opening degree value.

[0030] The second preset threshold is the lowest temperature value of the exhaust pipe.

[0031] Optionally, the control device is specifically used to control the first control valve to close when it is determined that the ammonia vaporization power has not reached the ammonia vaporization target power value.

[0032] Optionally, the control device is specifically used to determine that the exhaust heat from the engine is preferentially supplied to the ammonia supply device when it is determined that the exhaust gas treatment device has not completed heat storage.

[0033] Optionally, the engine's thermal management system further includes a second control valve, which is located at the exhaust heat inlet of the ammonia supply device;

[0034] The control device is electrically connected to the second control valve and is specifically used to determine whether the fourth temperature is greater than the third preset threshold, and when the fourth temperature is determined to be greater than the third preset threshold, control the second control valve to open.

[0035] Optionally, the control device is further configured to, after controlling the second control valve to open, control the opening degree of the second control valve to change in a positive correlation with the target power value of ammonia vaporization, and control the second control valve to close when the fourth temperature is detected to be less than or equal to the second preset threshold.

[0036] Wherein, the second preset threshold is the lowest temperature value of the exhaust pipe, and the second preset threshold is less than the third preset threshold.

[0037] Optionally, the control device is specifically used to determine that the exhaust gas treatment device has completed heat storage when it is determined that the second temperature is greater than a fourth preset threshold and the difference between the second temperature and the third temperature is less than a fifth preset threshold.

[0038] When the second temperature is determined to be less than or equal to the fourth preset threshold, or the difference between the second temperature and the third temperature is greater than or equal to the fifth preset threshold, it is determined that the exhaust gas treatment device has not completed heat storage.

[0039] Optionally, the control device is further configured to, upon detecting an abnormality in any one of the first, second, and third temperature sensors, issue a fault alarm and control the engine to stop supplying exhaust heat to the hydrogen supply device; and / or,

[0040] When an abnormality is detected in the fourth temperature sensor, a fault alarm is triggered, and the exhaust heat from the engine is stopped from being supplied to the ammonia supply device.

[0041] The solution provided by this invention includes a hydrogen supply device in the engine's thermal management system. This allows the hydrogen supply device to utilize the heat from the exhaust gas to convert liquid ammonia into hydrogen, which is then supplied to the engine to promote in-cylinder combustion. Simultaneously, an ammonia supply device is also included, allowing it to similarly utilize the heat from the exhaust gas to vaporize liquid ammonia into ammonia, which is then supplied to the engine, thus improving the engine's in-cylinder combustion efficiency. Furthermore, by installing a first temperature sensor, a second temperature sensor, a third temperature sensor, and a fourth temperature sensor at various locations on the exhaust pipe to detect a first temperature, a second temperature sensor to detect a second temperature, a third temperature sensor to detect a third temperature, and a fourth temperature sensor to detect a fourth temperature, the control device can further determine which exhaust gas heat to supply to the hydrogen and / or ammonia supply devices based on these temperatures. This ensures that the exhaust gas heat is fully utilized, improving engine combustion efficiency and helping to save on engine power and energy consumption.

[0042] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, although the drawings described below are some specific embodiments of the present invention, those skilled in the art can extend and extend the basic concepts of the device structure, driving method and manufacturing method disclosed and indicated by various embodiments of the present invention to other structures and drawings. Undoubtedly, these should all be within the scope of the claims of the present invention.

[0044] Figure 1 This is a schematic diagram of the structure of a thermal management system for an engine provided in an embodiment of the present invention;

[0045] Figure 2 A flowchart of a control method for an engine thermal management system provided in an embodiment of the present invention;

[0046] Figure 3 A flowchart illustrating another control method for an engine's thermal management system provided in an embodiment of the present invention;

[0047] Figure 4 A flowchart of another control method for an engine thermal management system provided in an embodiment of the present invention. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this invention. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the basic concepts disclosed and indicated in the embodiments of this invention, all other embodiments obtained by those skilled in the art are within the scope of protection of this invention.

[0049] Figure 1 This is a schematic diagram of the structure of a thermal management system for an engine provided in an embodiment of the present invention, as shown below. Figure 1As shown, the engine's thermal management system 100 includes: an exhaust pipe 10 connected to the exhaust outlet of the engine 70 for discharging exhaust gas generated by the engine 70; an exhaust gas treatment device 20 installed on the exhaust pipe 10 for treating the exhaust gas; a hydrogen supply device 30 coupled to the exhaust pipe 10 between the engine 70 and the exhaust gas treatment device 20 for using the heat from the exhaust gas of the engine 70 to prepare hydrogen from liquid ammonia and supply it to the engine 70; an ammonia supply device 40 coupled to the exhaust pipe 10 on the outlet side of the exhaust gas treatment device 20 for using the heat from the exhaust gas of the engine 70 to vaporize liquid ammonia into ammonia and supply it to the engine 70; and a first temperature sensor 51 installed on the exhaust pipe 10 between the engine 70 and the hydrogen supply device 30 for real-time detection of the exhaust gas. A first temperature sensor 51, a second temperature sensor 52, a third temperature sensor 53, and a fourth temperature sensor 54 are installed on the exhaust pipe 10 between the exhaust gas supply device 30 and the exhaust gas treatment device 20 to detect the second temperature of the exhaust gas in real time. A third temperature sensor 53 is installed on the exhaust pipe 10 between the exhaust gas treatment device 20 and the ammonia supply device 40 to detect the third temperature of the exhaust gas in real time. A fourth temperature sensor 54 is installed at the outlet end of the exhaust pipe 10 to detect the fourth temperature of the exhaust gas in real time. A control device 60 is electrically connected to the first temperature sensor 51, the second temperature sensor 52, the third temperature sensor 53, and the fourth temperature sensor 54 respectively, and is used to control the exhaust gas heat of the engine 70 to be supplied to the hydrogen supply device 30 and / or the ammonia supply device 40 according to the first temperature, the second temperature, the third temperature, and the fourth temperature.

[0050] Continue to refer to Figure 1 Engine 70 can be understood as a hybrid fuel engine. While traditional engines primarily use diesel fuel, liquid ammonia can be supplied to the ammonia supply device 40 via ammonia tank 80. This allows the ammonia supply device 40 to utilize the heat from the exhaust gas to vaporize the liquid ammonia into ammonia gas, which is then supplied to engine 70. Since ammonia combustion does not produce carbon dioxide, it can be considered a low-carbon fuel. This reduces diesel fuel consumption and significantly improves the engine's in-cylinder combustion efficiency. It is understood that ammonia gas is easier to burn completely than liquid ammonia and is less likely to accumulate in pipes, causing corrosion to pipes or seals. Because ammonia has a high ignition energy, it requires hydrogen or diesel fuel for ignition. Therefore, liquid ammonia from ammonia tank 80 can simultaneously be supplied to the hydrogen supply device 30. This allows the hydrogen supply device 30 to utilize the heat from the exhaust gas to convert the liquid ammonia into hydrogen gas, which is then supplied to engine 70. This accelerates the in-cylinder combustion rate, reduces diesel fuel consumption, and consequently reduces carbon emissions.

[0051] Continue to refer to Figure 1 NO will be present in the exhaust gas produced during the operation of engine 70. X To remove harmful emissions such as NO, an exhaust gas treatment device 20 is installed on the exhaust pipe 10 to treat the NO in the exhaust gas. XCatalytic reduction, such as reducing to ammonia under the action of a catalyst, can reduce the NO content in exhaust gases emitted into the atmosphere. X The content of harmful emissions, etc. It is understandable that during the operation of the exhaust gas treatment device 20, the catalytic reaction needs to be carried out at a certain high temperature, which will also affect the temperature change of the exhaust gas heat.

[0052] Specifically, since the exhaust heat generated by the engine 70 at startup differs significantly from that after prolonged stable operation, and the amount of exhaust heat utilized by the hydrogen supply device 30 and the ammonia supply device 40 also differs, determining the optimal supply of exhaust heat to the hydrogen supply device 30 and / or the ammonia supply device 40 is crucial for the normal operation of the engine and the reliability of the entire system. Therefore, by installing a first temperature sensor 51 at various locations on the exhaust pipe 10 to detect the first temperature at the engine 70 outlet, a second temperature sensor 52 to detect the second temperature at the exhaust gas treatment device 20 inlet, a third temperature sensor 53 to detect the third temperature at the exhaust gas treatment device 20 outlet, and a fourth temperature sensor 54 to detect the fourth temperature at the entire exhaust pipe 10 outlet, the control device 60 can further analyze and process these temperatures to ensure the exhaust heat is rationally distributed to the hydrogen supply device 30 and / or the ammonia supply device 40. This allows for full utilization of the exhaust heat, improving the combustion efficiency of the engine 70 and saving on electricity and fuel consumption.

[0053] In this embodiment, by setting the engine's thermal management system to include a hydrogen supply device, the hydrogen supply device can utilize the heat from the exhaust gas to prepare hydrogen from liquid ammonia and supply it to the engine, thereby promoting in-cylinder combustion. Simultaneously, an ammonia supply device is also set, allowing it to similarly utilize the heat from the exhaust gas to vaporize liquid ammonia and supply it to the engine, thus improving the engine's in-cylinder combustion efficiency. Furthermore, a first temperature sensor, a second temperature sensor, a third temperature sensor, and a fourth temperature sensor are installed at various locations on the exhaust pipe to detect a first temperature, a second temperature sensor to detect a second temperature, a third temperature sensor to detect a third temperature, and a fourth temperature sensor to detect a fourth temperature. The control device can further determine which exhaust gas heat to supply to the hydrogen supply device and / or the ammonia supply device based on these temperatures, ensuring that the exhaust gas heat is fully utilized to improve engine combustion efficiency and save on engine power and energy consumption.

[0054] Figure 2 A flowchart of a control method for an engine thermal management system provided in an embodiment of the present invention, in conjunction with reference to [reference needed]. Figure 1 and Figure 2As shown, the control device 60 is specifically used to determine whether the exhaust gas treatment device has completed heat storage based on the second temperature and the third temperature, and to determine, based on the determination result, that the exhaust gas heat of the engine is preferentially supplied to the ammonia supply device or the hydrogen supply device.

[0055] Specifically, the exhaust gas treatment device 20 needs to maintain a certain operating temperature during the catalytic treatment of exhaust gases to ensure efficient catalytic reaction. Therefore, when the engine 70 is first started, the exhaust gas treatment device 20 needs to store heat to ensure that the exhaust gases are treated promptly after passing through it, preventing them from being released into the atmosphere and causing air pollution. For example, the heat storage temperature of the exhaust gas treatment device 20 can be between 300℃ and 500℃.

[0056] refer to Figure 1 and Figure 2 After acquiring the first, second, third, and fourth temperatures, the control device 60 first determines whether the exhaust gas treatment device 20 has completed heat storage based on the second and third temperatures. If it determines that the exhaust gas treatment device 20 has completed heat storage, it further determines whether the first temperature is greater than a first preset threshold, and determines, based on the determination result, that the exhaust gas heat from the engine 70 is preferentially supplied to the ammonia supply device 40 or the hydrogen supply device 30. Conversely, if it determines that the exhaust gas treatment device 20 has not completed heat storage, it determines that the exhaust gas heat from the engine 70 is preferentially supplied to the ammonia supply device 40.

[0057] The specific value of the first preset threshold can be set according to the actual situation, and is not specifically limited here. It should be noted that since the hydrogen supply device 30 also requires electric heating for auxiliary heating during normal operation, in order to solve the problem of electrical energy, more exhaust gas heat can be provided to the hydrogen supply device 30, but it is also necessary to ensure that there is a surplus of exhaust gas heat for the equipment in the subsequent pipeline. Therefore, the specific value of the first preset threshold can be set according to the minimum temperature requirement of the exhaust gas heat required for normal operation of the hydrogen supply device 30, for example, the first preset temperature is 550℃.

[0058] Specifically, when it is determined that the exhaust gas treatment device 20 has completed heat storage, it indicates that the exhaust gas treatment device 20 can normally and efficiently treat harmful emissions in the exhaust gas. At this time, it can be further determined whether the first temperature is greater than the first preset temperature. Since the temperature required for the normal operation of the hydrogen supply device 30 is much higher than the temperature required for the normal operation of the ammonia supply device 40, the exhaust gas heat can be further determined to be supplied to the ammonia supply device 40 or the hydrogen supply device based on the comparison result of the first temperature and the first preset temperature. However, when it is determined that the exhaust gas treatment device 20 has not completed heat storage, it is necessary to ensure that the exhaust gas heat can store as much heat as possible in the exhaust gas treatment device 20. During the continuous heat storage process of the exhaust gas heat in the exhaust gas treatment device 20, some heat will also be output by the exhaust gas treatment device 20. At this time, the exhaust gas heat of the engine 70 can be preferentially supplied to the ammonia supply device 40.

[0059] Optionally, the control device 60 is specifically used to determine that the exhaust gas treatment device 20 has completed heat storage when it is determined that the second temperature is greater than the fourth preset threshold and the difference between the second temperature and the third temperature is less than the fifth preset threshold; and to determine that the exhaust gas treatment device 20 has not completed heat storage when it is determined that the second temperature is less than or equal to the fourth preset threshold, or the difference between the second temperature and the third temperature is greater than or equal to the fifth preset threshold.

[0060] The fourth preset threshold is the minimum temperature limit required for the exhaust gas treatment device 20 to perform catalytic treatment on the exhaust gas. Its specific value can be set according to the actual situation, for example, the fourth preset threshold is 300℃.

[0061] The fifth preset threshold is the maximum difference in temperature of the exhaust gas heat before and after the exhaust gas treatment device 20 performs catalytic treatment on the exhaust gas. Its specific value is set according to the actual situation and is not specifically limited here. For example, the fifth preset threshold is 100℃.

[0062] Specifically, when the second temperature is greater than the fourth preset threshold, and the difference between the second and third temperatures is less than the fifth preset threshold, it indicates that the temperature at the inlet of the exhaust gas treatment device 20 is greater than the minimum temperature limit required for catalytic treatment of the exhaust gas by the exhaust gas treatment device 20, and the temperature difference between the inlet and outlet of the exhaust gas treatment device 20 (i.e., the difference between the second and third temperatures) is also small. Therefore, the exhaust gas treatment device 20 can be considered to have completed heat storage. Conversely, when the second temperature is less than or equal to the fourth preset threshold, or the difference between the second and third temperatures is greater than or equal to the fifth preset threshold, the exhaust gas treatment device 20 can be considered to have not completed heat storage. Optionally, continue to refer to... Figure 1 and Figure 2 As shown, the control device 60 is specifically used to determine that when the first temperature is greater than the first preset threshold, the exhaust heat of the engine 70 is preferentially supplied to the hydrogen supply device.

[0063] Specifically, when it is determined that the exhaust gas treatment device 20 has completed heat storage and the first temperature is greater than the first preset threshold, it indicates that the temperature of the exhaust gas heat generated by the engine 70 is relatively high. It can be determined that the exhaust gas heat of the engine 70 is preferentially supplied to the hydrogen supply device 30 so that the hydrogen supply device 30 can use the exhaust gas heat to prepare liquid ammonia into hydrogen and supply it to the engine 70, thereby promoting in-cylinder combustion of the engine 70, which helps to save diesel fuel and makes the combustion more complete.

[0064] Further reference Figure 1 The engine thermal management system 100 also includes a first control valve 91, which is located at the exhaust heat inlet of the hydrogen supply device 30, and the control device 60 is electrically connected to the first control valve 91; the engine thermal management system 100 also includes a second control valve 92, which is located at the exhaust heat inlet of the ammonia supply device 40, and the control device 60 is electrically connected to the second control valve 92.

[0065] Figure 3 A flowchart of another control method for an engine's thermal management system is provided as an embodiment of the present invention, in conjunction with reference to [reference needed]. Figure 1 and Figure 3 As shown, the control device 60 is used to obtain the hydrogen production power of the hydrogen supply device 30 after determining that the exhaust heat of the engine 70 is preferentially supplied to the hydrogen supply device 30, and to control the opening degree of the first control valve 91 according to the hydrogen production power to adjust the amount of exhaust heat supplied to the hydrogen supply device 30.

[0066] Specifically, the hydrogen production power is used to characterize the amount of hydrogen produced. The higher the hydrogen production power, the more hydrogen is produced; conversely, the lower the hydrogen production power, the less hydrogen is produced. Depending on the hydrogen production power, the amount of tail gas heat required by the hydrogen supply device 30 will also vary. That is, the higher the hydrogen production power, the greater the tail gas heat required by the hydrogen supply device 30, and the larger the opening of the first control valve 91 controlled by the control device 60; conversely, the lower the hydrogen production power, the less tail gas heat required by the hydrogen supply device 30, and the smaller the opening of the first control valve 91 controlled by the control device 60.

[0067] Further optionally, the control device 60 is specifically used to control the opening degree of the first control valve 91 to the maximum opening degree value when it is determined that the hydrogen production power is not equal to zero and the fourth temperature is greater than the second preset threshold; wherein, the second preset threshold is the lowest temperature value of the exhaust pipe 10.

[0068] The specific value of the second preset threshold can be set according to the actual situation, and no specific limit is made here. For example, the second preset threshold is 130℃.

[0069] Specifically, when the temperature of the exhaust pipe 10 is low, the exhaust gas produced by the engine 70 will produce condensate, and the NO in the exhaust gas will... X It will dissolve in the condensate to produce sulfuric acid, which easily corrodes the exhaust pipe 10. Therefore, it is necessary to ensure that the temperature of the exhaust pipe 10 does not fall below its minimum temperature value during the transfer of exhaust gas heat through the exhaust pipe 10. In addition, since the hydrogen supply device 30 requires auxiliary heating from electric heating devices when using exhaust gas heat to produce hydrogen, when the hydrogen production power is not zero and the fourth temperature is greater than the second preset threshold, the opening of the first control valve 91 can be controlled to the maximum opening value regardless of the hydrogen production power. This ensures that the exhaust gas heat can be provided to the hydrogen supply device 30 to the maximum extent, so as to promote the hydrogen supply device 30 to produce hydrogen from liquid ammonia while reducing the auxiliary heating heat of the electric heating devices and saving energy.

[0070] Continue to refer to Figure 3 The control device 60 is specifically used to control the opening degree of the first control valve 91 to 20% of the maximum opening degree when the hydrogen production power is determined to be zero, so as to preheat the hydrogen supply device 30.

[0071] Specifically, when the hydrogen production power is determined to be zero, it indicates that the hydrogen stored in the hydrogen supply device 30 is sufficient and there is no need to produce hydrogen. At this time, the opening degree of the first control valve 91 can be controlled to 20% of the maximum opening value to preheat the hydrogen supply device 30. When the hydrogen supply device 30 needs to produce hydrogen again, the temperature of the liquid ammonia catalytic decomposition can be quickly brought up to the required temperature, thereby accelerating the reaction efficiency of liquid ammonia catalytic production into hydrogen.

[0072] Optional, continue to refer to Figure 1 and Figure 3 The control device 60 is used to determine whether the fourth temperature is greater than the third preset threshold after adjusting the opening of the first control valve 91 according to the hydrogen production power to adjust the amount of tail gas heat supplied to the hydrogen supply device 30, and when it is determined that the fourth temperature is greater than the third preset threshold, it controls the second control valve 92 to open.

[0073] The third preset threshold is the initial threshold for controlling the second control valve 92 to open. Its specific value can be set according to actual conditions and is not specifically limited here. The third preset threshold can be set to be greater than the second preset threshold to avoid a decrease in the fourth temperature after the second control valve 92 opens, which could affect the normal opening of the first control valve 91. For example, the third preset threshold is 160℃.

[0074] Specifically, after the control device 60 adjusts the amount of heat from the exhaust gas supplied to the hydrogen supply device 30 by controlling the opening of the first control valve 91 according to the hydrogen production power, it can further determine whether the fourth temperature is greater than the third preset threshold to determine whether the heat from the exhaust gas is sufficient. When the fourth temperature is determined to be greater than the third preset threshold, it can be considered that the heat from the exhaust gas is relatively sufficient. At this time, the second control valve 92 can be controlled to open so that the heat from the exhaust gas can continue to be supplied to the ammonia supply device 40, allowing the ammonia supply device 40 to simultaneously use the heat from the exhaust gas to vaporize liquid ammonia into ammonia gas. Conversely, when the fourth temperature is determined to be less than or equal to the third preset threshold, the second control valve 92 can be controlled to remain closed.

[0075] Continue to refer to Figure 2 or Figure 3 The control device 60 is used to determine that when the first temperature is less than or equal to the first preset threshold, the exhaust heat of the engine 70 is preferentially supplied to the ammonia supply device 40.

[0076] Specifically, when it is determined that the exhaust gas treatment device 20 has completed heat storage, and further determined that the first temperature is less than or equal to the first preset threshold, it indicates that the exhaust gas heat is low. Although the hydrogen supply device 30 has an auxiliary heating electric heating device, it will lead to excessive power consumption. However, compared with the hydrogen supply device 30, the ammonia supply device 40 can use less exhaust gas heat to vaporize liquid ammonia into ammonia. Thus, when it is determined that the first temperature is less than or equal to the first preset threshold, the exhaust gas heat of the engine 70 can be preferentially supplied to the ammonia supply device 40 to prioritize the preparation of ammonia and improve the in-cylinder combustion efficiency of the engine 70.

[0077] Further options are available for reference. Figure 3 The control device 60 is specifically used to determine whether the fourth temperature is greater than the third preset threshold, and when it is determined that the fourth temperature is greater than the third preset threshold, it controls the second control valve 92 to open.

[0078] Specifically, after determining that the exhaust heat from the engine 70 is preferentially supplied to the ammonia supply device 40, the control device 60 will further determine whether the fourth temperature is greater than the third preset threshold. When the fourth temperature is determined to be greater than the third preset threshold, it can be considered that the exhaust heat is still relatively sufficient. At this time, the second control valve 92 can be controlled to open so that the exhaust heat can continue to be supplied to the ammonia supply device 40, allowing the ammonia supply device 40 to use the exhaust heat to vaporize liquid ammonia into ammonia gas. Conversely, when the fourth temperature is determined to be less than or equal to the third preset threshold, the second control valve 92 can be controlled to remain closed.

[0079] Further options are available for reference. Figure 3The control device 60 is used to obtain the ammonia vaporization power of the ammonia supply device 40 after the second control valve 92 is opened, and to determine whether the ammonia vaporization power has reached the ammonia vaporization target power value, and to control the opening or closing of the first control valve according to the determination result.

[0080] Specifically, the ammonia vaporization power refers to the actual amount of ammonia produced by the ammonia supply device. After the control device 60 opens the second control valve 92, it continues to acquire the ammonia vaporization power of the ammonia supply device 40. This ammonia vaporization power can be compared with the target ammonia vaporization power value, which can be any value set by the user. The specific value can be set according to actual conditions and is not specifically limited here. Based on the judgment result, it can be determined whether the liquid ammonia has been vaporized, and then the first control valve 91 can be controlled to open accordingly.

[0081] Further options are available for reference. Figure 3 The control device 60 is specifically used to control the first control valve 91 to open when it is determined that the ammonia vaporization power reaches the ammonia vaporization target power value and the fourth temperature is greater than the second preset threshold. The opening degree of the first control valve 91 is 20% of the maximum opening degree value. The second preset threshold is the lowest temperature value of the exhaust pipe.

[0082] Specifically, when the control device 60 determines that the ammonia vaporization power has reached the target ammonia vaporization power value, it indicates that the ammonia supply device 40 has completed the vaporization of all the received liquid ammonia. At this time, it can be further determined whether the fourth temperature is greater than the second preset threshold. If it is further determined that the fourth temperature is also greater than the second preset threshold, the excess tail gas heat can be controlled to continue to be supplied to the hydrogen supply device 30. This avoids excessive tail gas heat being supplied to the hydrogen supply device, which would cause a large drop in the fourth temperature and affect the opening of the second control valve 92. The opening degree of the first control valve 91 can be controlled to be 20% of the maximum opening value. In addition, considering that this part of the tail gas heat cannot effectively enable the hydrogen supply device 30 to produce hydrogen, the small part of the tail gas heat supplied to the hydrogen supply device 30 can be used to preheat the hydrogen supply device 30.

[0083] Optional, continue to refer to Figure 3 The control device 60 is specifically used to control the first control valve 91 to close when it is determined that the ammonia vaporization power has not reached the ammonia vaporization target power value.

[0084] Specifically, when the control device 60 determines that the ammonia vaporization power has not reached the target ammonia vaporization power value, it means that the ammonia supply device has not yet completed the vaporization of all the received liquid ammonia. At this time, the tail gas heat can continue to be preferentially supplied to the ammonia supply device, and the first control valve 91 is controlled to close.

[0085] Optional, continue to refer to Figure 3When it is determined that the exhaust gas treatment device 20 has not completed heat storage, and the exhaust gas heat of the engine 70 is preferentially supplied to the ammonia supply device 40, the control device 60 is specifically used to determine whether the fourth temperature is greater than the third preset threshold, and when it is determined that the fourth temperature is greater than the third preset threshold, the control device 60 controls the second control valve to open.

[0086] Specifically, after determining that the exhaust gas treatment device 20 has not completed heat storage and controlling the exhaust gas heat from the engine 70 to be preferentially supplied to the ammonia supply device 40, the control device 60 will continue to determine whether the fourth temperature is greater than the third preset threshold. When the fourth temperature is determined to be greater than the third preset threshold, it can be considered that the exhaust gas heat is still relatively sufficient. At this time, the second control valve 92 can be controlled to open so that the exhaust gas heat can be supplied to the ammonia supply device 40, allowing the ammonia supply device 40 to use the exhaust gas heat to vaporize liquid ammonia into ammonia gas. Conversely, when the fourth temperature is determined to be less than or equal to the third preset threshold, the second control valve 92 can be controlled to remain closed.

[0087] Optional, Figure 4 A flowchart of a control method for an engine thermal management system provided in an embodiment of the present invention is shown in the reference. Figure 1 and Figure 4 As shown, the control device 60 is also used to control the opening degree of the second control valve 92 to change in a positive correlation with the target power value of ammonia vaporization after the second control valve 92 is opened, and to control the second control valve to close when the fourth temperature is detected to be less than or equal to the second preset threshold; wherein, the second preset threshold is the lowest temperature value of the exhaust pipe, and the second preset threshold is less than the third preset threshold.

[0088] Specifically, after the control device 60 opens the second control valve 92, the ammonia supply device 40 can vaporize liquid ammonia into ammonia gas based on the heat of the exhaust gas. At this time, the opening degree of the second control valve 92 can be adjusted according to the target power of ammonia vaporization. The two are positively correlated; that is, the higher the target power of ammonia vaporization, the larger the opening degree of the second control valve 92, and vice versa. As the heat of the exhaust gas is continuously and preferentially supplied to the ammonia supply device 40, the fourth temperature will also change. At this time, the fourth temperature can be detected in real time, and it can be determined whether the fourth temperature is greater than the second preset threshold. When it is determined that the fourth temperature is less than or equal to the second preset threshold, the second control valve 92 is closed to prevent the temperature of the exhaust pipe 10 from being too low, which would cause condensation in the exhaust gas and reduce the NO in the exhaust gas. X The sulfuric acid produced when dissolved in condensate corrodes the exhaust pipe 10. Conversely, when the fourth temperature is determined to be greater than the second preset threshold, the second control valve 92 can continue to be kept open.

[0089] It should be noted that the second preset threshold here is less than the third preset threshold. The reason is that the second control valve 92 is initially closed. The second control valve 92 is set to open only when the fourth temperature is detected to be greater than the third preset threshold. This can prevent the second control valve 92 from closing as soon as it opens due to the decrease in the fourth temperature, which would cause the second control valve 92 to operate frequently and reduce its service life.

[0090] Optionally, based on any of the above embodiments, refer to... Figure 1 When the control device 60 detects an abnormality in any one of the first temperature sensor 51, the second temperature sensor 52, and the third temperature sensor 53, it issues a fault alarm and controls the engine 70 to stop supplying exhaust heat to the hydrogen supply device 30; and / or, when it detects an abnormality in the fourth temperature sensor 54, it issues a fault alarm and controls the engine 70 to stop supplying exhaust heat to the ammonia supply device 40.

[0091] Specifically, since the hydrogen supply device 30 requires a higher temperature than the ammonia supply device 40, if any of the three temperature sensors—first temperature sensor 51, second temperature sensor 52, and third temperature sensor 53—malfunctions, the temperature value detected by the malfunctioning sensor cannot be accurately obtained. Therefore, it cannot be determined whether the exhaust heat is sufficient to meet the needs of the hydrogen supply device 30. In this case, the exhaust heat supply to the hydrogen supply device 30 can be stopped to ensure the stable operation of the engine 70, and a fault alarm can be triggered to remind personnel to perform timely maintenance. Furthermore, to prevent condensation from the exhaust gas produced by the engine 70 and potential damage to the exhaust pipe 10, the temperature at the outlet of the exhaust pipe 10 must meet certain requirements while ensuring the engine 70 fully utilizes the exhaust heat. When the fourth temperature sensor 54 is detected to be malfunctioning, the exhaust heat supply to the ammonia supply device 40 can be stopped to ensure the stable operation of the engine 70, and a fault alarm can be triggered to remind personnel to perform timely maintenance.

[0092] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A thermal management system for an engine, characterized in that, include: An exhaust pipe, connected to the engine exhaust outlet, is used to discharge the exhaust gas produced by the engine; An exhaust gas treatment device is installed on the exhaust pipe to treat the exhaust gas; A hydrogen supply device, coupled to the exhaust pipe between the engine and the exhaust gas treatment device, is used to generate hydrogen from liquid ammonia using the heat of the engine's exhaust gas and electric auxiliary heating and supply it to the engine. An ammonia supply device is coupled to the exhaust pipe on the outlet side of the exhaust gas treatment device, and is used to vaporize liquid ammonia into ammonia gas using the heat of the engine exhaust gas and supply it to the engine. A first temperature sensor is installed on the exhaust pipe between the engine and the hydrogen supply device to detect the first temperature of the exhaust gas in real time. A second temperature sensor is installed on the exhaust pipe between the hydrogen supply device and the exhaust gas treatment device to detect the second temperature of the exhaust gas in real time. A third temperature sensor is installed on the exhaust pipe between the exhaust gas treatment device and the ammonia supply device to detect the third temperature of the exhaust gas in real time. A fourth temperature sensor is installed at the outlet end of the exhaust pipe to detect the fourth temperature of the exhaust gas in real time. A control device is electrically connected to the first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor, respectively, and is used to control the supply of exhaust heat from the engine to the hydrogen supply device and / or the ammonia supply device based on the first temperature, the second temperature, the third temperature, and the fourth temperature. The control device is used to determine whether the exhaust gas treatment device has completed heat storage based on the second temperature and the third temperature, and to determine, based on the determination result, that the exhaust gas heat of the engine is preferentially supplied to the ammonia supply device or the hydrogen supply device. The control device is used to determine whether the first temperature is greater than the first preset threshold when the exhaust gas treatment device has completed heat storage, and to determine, based on the determination result, to preferentially supply the exhaust gas heat of the engine to the ammonia supply device or the hydrogen supply device. The control device is used to determine that when the first temperature is greater than the first preset threshold, the exhaust heat of the engine is preferentially supplied to the hydrogen supply device. The control device is used to determine that when the first temperature is less than or equal to the first preset threshold, the exhaust heat of the engine is preferentially supplied to the ammonia supply device. The control device is used to determine that, when it is determined that the exhaust gas heat from the engine has not completed heat storage, the exhaust gas heat should be preferentially supplied to the ammonia supply device.

2. The thermal management system for the engine according to claim 1, characterized in that, The engine's thermal management system also includes a first control valve, which is located at the exhaust heat inlet of the hydrogen supply device. The control device is electrically connected to the first control valve and is used to obtain the hydrogen production power of the hydrogen supply device after determining that the exhaust heat of the engine is preferentially supplied to the hydrogen supply device, and control the opening degree of the first control valve according to the hydrogen production power to adjust the amount of exhaust heat supplied to the hydrogen supply device.

3. The thermal management system for the engine according to claim 2, characterized in that, The control device is used to control the opening degree of the first control valve to the maximum opening degree value when it is determined that the hydrogen production power is not equal to zero and the fourth temperature is greater than the second preset threshold. The second preset threshold is the minimum temperature value at which condensation is avoided in the exhaust pipe.

4. The thermal management system for the engine according to claim 2, characterized in that, The control device is used to control the opening degree of the first control valve to 20% of the maximum opening value when it is determined that the hydrogen production power is equal to zero, so as to preheat the hydrogen supply device.

5. The thermal management system for the engine according to claim 2, characterized in that, The engine's thermal management system also includes a second control valve, which is located at the exhaust heat inlet of the ammonia supply device. The control device is electrically connected to the second control valve and is used to determine whether the fourth temperature is greater than the third preset threshold after controlling the opening of the first control valve according to the hydrogen production power to adjust the amount of heat of the exhaust gas supplied to the hydrogen supply device, and to control the second control valve to open when it is determined that the fourth temperature is greater than the third preset threshold.

6. The thermal management system for the engine according to claim 1, characterized in that, The engine's thermal management system also includes a second control valve, which is located at the exhaust heat inlet of the ammonia supply device. The control device is electrically connected to the second control valve and is used to determine whether the fourth temperature is greater than the third preset threshold. When it is determined that the fourth temperature is greater than the third preset threshold, the control device controls the second control valve to open.

7. The thermal management system for the engine according to claim 6, characterized in that, The engine's thermal management system also includes a first control valve, which is located at the exhaust heat inlet of the hydrogen supply device. The control device is electrically connected to the first control valve and is used to obtain the ammonia vaporization power of the ammonia supply device after controlling the second control valve to open, determine whether the ammonia vaporization power reaches the ammonia vaporization target power value, and control the opening or closing of the first control valve according to the determination result.

8. The thermal management system for the engine according to claim 7, characterized in that, The control device is used to control the first control valve to open when it is determined that the ammonia vaporization power reaches the ammonia vaporization target power value and the fourth temperature is greater than the second preset threshold, and the opening degree of the first control valve is 20% of the maximum opening degree value.

9. The thermal management system for the engine according to claim 7, characterized in that, The control device is used to control the first control valve to close when it is determined that the ammonia vaporization power has not reached the ammonia vaporization target power value.

10. The thermal management system for the engine according to claim 5 or 6, characterized in that, The control device is also used to control the opening degree of the second control valve to change in a positive correlation with the target power value of ammonia vaporization after the second control valve is opened, and to control the second control valve to close when the fourth temperature is detected to be less than or equal to the second preset threshold. The second preset threshold is the minimum temperature value at which condensation is avoided in the exhaust pipe, and the second preset threshold is less than the third preset threshold.

11. The thermal management system for the engine according to claim 1, characterized in that, The control device is used to determine that the exhaust gas treatment device has completed heat storage when it is determined that the second temperature is greater than a fourth preset threshold and the difference between the second temperature and the third temperature is less than a fifth preset threshold. When the second temperature is determined to be less than or equal to the fourth preset threshold, or the difference between the second temperature and the third temperature is greater than or equal to the fifth preset threshold, it is determined that the exhaust gas treatment device has not completed heat storage.

12. The thermal management system for the engine according to claim 1, characterized in that, The control device is further configured to, upon detecting an abnormality in any one of the first, second, and third temperature sensors, issue a fault alarm and control the engine to stop supplying exhaust heat to the hydrogen supply device; and / or, When an abnormality is detected in the fourth temperature sensor, a fault alarm is triggered, and the exhaust heat from the engine is stopped from being supplied to the ammonia supply device.

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