Engine thermal management method, system, electronic device, engine and vehicle

Abstract

The application relates to the technical field of engines and provides an engine thermal management method, system, electronic device, engine and vehicle, the method comprising the following steps: acquiring a first actual conversion efficiency of an SCR aftertreatment device of an engine on to-be-treated gas; in the case that the first actual conversion efficiency is less than a preset conversion efficiency threshold, controlling the SCR aftertreatment device to perform primary regeneration; acquiring an actual conversion efficiency change trend of the SCR aftertreatment device after the primary regeneration; based on the actual conversion efficiency change trend, controlling the SCR aftertreatment device to perform secondary regeneration; based on a plurality of third actual conversion efficiencies of the SCR aftertreatment device after the secondary regeneration, obtaining a determination result of whether the SCR aftertreatment device is poisoned; and in the case that the SCR aftertreatment device is poisoned, increasing the temperature of an SCR carrier to a preset target temperature. The method can accurately determine whether the SCR aftertreatment device is poisoned, and can guarantee that the emission amount meets the standard.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and in particular to an engine thermal management method, system, electronic device, engine, and vehicle. Background Technology

[0002] With increasing environmental awareness, engine emission control has received growing attention. Engines, such as diesel engines, emit harmful gases (such as nitrogen oxides (NOx)). x Emissions control for engines such as [list of engines] primarily employs Selective Catalytic Reduction (SCR) technology. The engine's SCR aftertreatment system is effective against NOx. x The conversion efficiency of harmful gases such as NO largely depends on the activity of the SCR catalyst in the SCR aftertreatment unit, as well as the temperature of the SCR catalyst and the carrier. However, fuel quality varies from region to region. In some areas, the sulfur and phosphorus content in the fuel is high, which can easily lead to poisoning of the SCR aftertreatment unit. For example, sulfur in the fuel can react with the SCR coating itself in the SCR aftertreatment unit to form compounds, reducing the active sites of the SCR catalyst on the coating surface. At the same time, it can also generate chemicals such as ammonium sulfate that adhere to the SCR catalyst, reducing the SCR catalyst's ability to react with NO. x The conversion efficiency is low, causing sulfur poisoning in the SCR aftertreatment unit. Additionally, low SCR carrier temperatures can also lead to NO... x Excessive SO2 emissions and NH3 leaks.

[0003] Currently, NO is typically filtered out at the outlet of the engine's SCR aftertreatment system. x The method monitors the content of harmful gases and issues an alarm when the content reaches or exceeds a preset threshold, while simultaneously limiting speed and torque to prevent the emission of large amounts of harmful gases. However, this method cannot accurately determine whether the SCR aftertreatment device is poisoned, and it also alters vehicle operation, interferes with driver operation, and results in a poor user experience. Summary of the Invention

[0004] This invention provides an engine thermal management method, system, electronic device, engine, and vehicle to solve the problem in the prior art that it is impossible to accurately determine whether the SCR aftertreatment device is poisoned, and that changing the vehicle's operating conditions and interfering with the driver's driving results in a poor user experience.

[0005] This invention provides an engine thermal management method, comprising:

[0006] Obtain the first actual conversion efficiency of the gas to be treated by the SCR aftertreatment device of the engine;

[0007] If the first actual conversion efficiency is less than the preset conversion efficiency threshold, the SCR post-processing device is controlled to perform one regeneration.

[0008] The actual conversion efficiency change trend of the SCR after-treatment device after one regeneration is obtained. The actual conversion efficiency change trend is the trend of multiple second actual conversion efficiencies of the SCR after-treatment device for the gas to be treated within a preset temperature range.

[0009] Based on the actual conversion efficiency change trend, the SCR post-processing device is controlled to perform secondary regeneration.

[0010] Based on the multiple third actual conversion efficiencies of the SCR post-treatment device for the gas to be treated after secondary regeneration, the determination result of whether the SCR post-treatment device is poisoned is obtained.

[0011] In the event of poisoning of the SCR aftertreatment device, the temperature of the SCR carrier is raised to a preset target temperature to complete the SCR poisoning treatment and engine thermal management.

[0012] Optionally, the step of obtaining the actual conversion efficiency change trend of the SCR after one regeneration includes:

[0013] According to a preset first acquisition cycle, the temperature of the SCR carrier and the second actual conversion efficiency of the SCR post-processing device at each temperature are periodically acquired to obtain multiple second actual conversion efficiencies of the SCR post-processing device within the temperature range.

[0014] Based on multiple second actual conversion efficiencies, the trend of the actual conversion efficiency is obtained.

[0015] Optionally, the step of controlling the SCR post-processing device to perform secondary regeneration based on the actual conversion efficiency change trend includes:

[0016] When the actual conversion efficiency shows a decreasing trend, the SCR post-processing device is controlled to perform secondary regeneration.

[0017] Optionally, the step of determining whether the SCR post-treatment device is poisoned based on multiple third actual conversion efficiencies of the SCR post-treatment device for the gas to be treated after secondary regeneration includes:

[0018] If the multiple third actual conversion efficiencies show a decreasing trend after secondary regeneration, the temperature of the SCR carrier and the fourth actual conversion efficiency of the SCR post-processing device at each temperature are periodically collected according to the preset second collection cycle, so as to obtain the multiple fourth actual conversion efficiencies of the SCR post-processing device within the temperature range.

[0019] The determination result is obtained based on the fourth actual conversion efficiency and the preset calibrated conversion efficiency. The calibrated conversion efficiency and the fourth actual conversion efficiency have a corresponding relationship, and each calibrated conversion efficiency corresponds to a corresponding temperature.

[0020] Optionally, the step of obtaining the determination result based on the fourth actual conversion efficiency and the preset calibrated conversion efficiency includes:

[0021] When the temperature of the SCR carrier is the first temperature value of the temperature range, it is determined whether the fourth actual conversion efficiency at the first temperature value is less than the corresponding calibrated conversion efficiency. If the fourth actual conversion efficiency is less than the corresponding calibrated conversion efficiency, it is determined that the SCR post-processing device meets the first determination condition of SCR poisoning.

[0022] When the temperature of the SCR carrier reaches the second temperature value of the temperature range, multiple fifth actual conversion efficiencies of the SCR post-processing device within the temperature range are obtained, and the difference between each fifth actual conversion efficiency and the corresponding calibrated conversion efficiency is determined as an efficiency difference set; the first temperature value is less than the second temperature value.

[0023] If the difference in the efficiency difference set is decreasing, the SCR post-processing device is determined to meet the second criterion for SCR poisoning.

[0024] If the SCR post-processing device is determined to meet the preset target determination conditions at least twice, the determination result of the SCR post-processing device being poisoned is obtained, wherein the target determination conditions are the satisfaction of the first determination condition and the second determination condition.

[0025] Optionally, in the event of SCR aftertreatment device poisoning, the steps of raising the temperature of the SCR carrier to a preset target temperature to complete the SCR poisoning treatment and engine thermal management include:

[0026] In the event of poisoning of the SCR aftertreatment device, the temperature of the SCR carrier is raised and maintained at the target temperature until the engine stops running, while an SCR poisoning alarm is issued.

[0027] The present invention also provides an engine thermal management system, comprising:

[0028] The first actual conversion efficiency acquisition module is used to acquire the first actual conversion efficiency of the engine's SCR aftertreatment device for the gas to be treated in the exhaust gas.

[0029] A primary regeneration module is used to control the SCR post-processing device to perform a primary regeneration when the first actual conversion efficiency is less than a preset conversion efficiency threshold.

[0030] The trend acquisition module is used to acquire the actual conversion efficiency change trend of the SCR after-treatment device after one regeneration. The actual conversion efficiency change trend is the trend of multiple second actual conversion efficiencies of the SCR after-treatment device for the gas to be treated within a preset temperature range.

[0031] The secondary regeneration module is used to control the SCR post-processing device to perform secondary regeneration based on the actual conversion efficiency change trend.

[0032] The poisoning determination module is used to determine whether the SCR post-treatment device is poisoned based on multiple third actual conversion efficiencies of the SCR post-treatment device for the gas to be treated after secondary regeneration.

[0033] The thermal management module is used to raise the temperature of the SCR carrier to a preset target temperature in the event of poisoning of the SCR aftertreatment device, so as to complete the SCR poisoning treatment and engine thermal management.

[0034] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of any of the above-described engine thermal management methods.

[0035] The present invention also provides an engine, including: an SCR aftertreatment device and electronic equipment as described above.

[0036] The present invention also provides a vehicle comprising: an engine as described above.

[0037] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the above-described engine thermal management methods.

[0038] The engine thermal management method, system, electronic device, engine, and vehicle provided by this invention obtain the first actual conversion efficiency of the gas to be treated by the SCR aftertreatment device of the engine; if the first actual conversion efficiency is less than a preset conversion efficiency threshold, control the SCR aftertreatment device to perform a first regeneration; obtain the actual conversion efficiency change trend of the SCR aftertreatment device after the first regeneration, the actual conversion efficiency change trend being the trend of multiple second actual conversion efficiencies of the SCR aftertreatment device for the gas to be treated within a preset temperature range; based on the actual conversion efficiency change trend, control the SCR aftertreatment device to perform a second regeneration; based on the multiple third actual conversion efficiencies of the SCR aftertreatment device for the gas to be treated after the second regeneration, obtain a determination result of whether the SCR aftertreatment device is poisoned; if the SCR aftertreatment device is poisoned, raise the temperature of the SCR carrier to a preset target temperature to complete the SCR poisoning treatment and engine thermal management. It can accurately determine whether the SCR aftertreatment device is poisoned, and by increasing the temperature of the SCR carrier through thermal management to complete the poisoning treatment, it can ensure that the emissions of the gas to be treated meet the standards as much as possible in the case of poisoning of the SCR aftertreatment device, without changing the vehicle operation or intervening in the driver's driving, thus effectively improving the driving experience. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0040] Figure 1 This is a flowchart illustrating an embodiment of the engine thermal management method provided by the present invention;

[0041] Figure 2 This is a flowchart illustrating an embodiment of the engine thermal management system provided by the present invention;

[0042] Figure 3 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0043] 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. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0044] To facilitate understanding of the technical solution provided by this invention, the SCR post-processing device and its working principle are explained below.

[0045] SCR aftertreatment device: A device that uses SCR technology to treat the exhaust gas of engines (such as diesel engines).

[0046] The working principle of the SCR aftertreatment device is as follows: Urea solution is sprayed into the exhaust pipe. Due to the high temperature, the urea solution decomposes into ammonia (NH3) and carbon dioxide (CO2). NH3, under the action of the catalyst in the SCR aftertreatment device (the catalyst is attached to the SCR carrier), undergoes a reduction reaction with harmful gases such as nitrogen oxides, reducing them to nitrogen (N2) and water (H2O), thereby reducing the emission of harmful gases from the engine.

[0047] SCR aftertreatment unit poisoning: Sulfur, phosphorus, and other substances in the exhaust gas react with the SCR coating itself in the SCR aftertreatment unit to form compounds, reducing the active sites of the SCR catalyst on the coating surface. Simultaneously, chemicals such as ammonium sulfate adhere to the SCR catalyst, reducing its effectiveness against NO. x The conversion efficiency of the gas awaiting treatment is referred to as SCR aftertreatment device poisoning.

[0048] The following examples illustrate this approach. Figures 1 to 3 This invention describes the engine thermal management method, system, electronic equipment, engine, and vehicle provided by the present invention.

[0049] Please refer to Figure 1 The engine thermal management method provided in this embodiment includes:

[0050] S110: Obtain the first actual conversion efficiency of the gas to be treated by the engine's SCR aftertreatment device.

[0051] Specifically, in this embodiment, the gas to be treated refers to nitrogen oxides in the exhaust gas emitted by the engine. In actual implementation, the gas to be treated can also be carbon monoxide or other substances in the exhaust gas emitted by the engine. This embodiment obtains the first actual conversion efficiency to facilitate subsequent control of the SCR aftertreatment device to perform a single regeneration based on the first actual conversion efficiency.

[0052] S120: When the first actual conversion efficiency is less than the preset conversion efficiency threshold, control the SCR post-processing device to perform one regeneration.

[0053] Specifically, regeneration refers to the process of burning off particles or compounds in exhaust gas through exhaust heating, with regeneration temperatures typically between 550℃ and 600℃. The conversion efficiency threshold can be set according to actual needs, such as 80%. Step S120 involves forcibly controlling the SCR aftertreatment device to undergo a single regeneration when the first actual conversion efficiency is less than the conversion efficiency threshold. This single regeneration can be performed while the vehicle is parked or while it is in operation. The high regeneration temperature can decompose the sulfides produced by high-sulfur fuel oil to a certain extent, thereby improving the actual conversion efficiency of the SCR aftertreatment device. It is understandable that the reason why the first actual conversion efficiency is less than the conversion efficiency threshold may be due to factors such as a low SCR carrier temperature. Therefore, by forcibly controlling the SCR aftertreatment device to undergo a single regeneration, the actual conversion efficiency of the SCR aftertreatment device can be improved, facilitating subsequent poisoning assessment of the SCR aftertreatment device. If the actual conversion efficiency of the SCR post-processing unit is high after one regeneration, it can be determined that the reason why the current actual conversion efficiency is less than the conversion efficiency threshold is due to the low temperature of the SCR carrier, thus ruling out the possibility of poisoning. However, if the actual conversion efficiency of the SCR post-processing unit gradually decreases after one regeneration, it is necessary to further determine whether the SCR post-processing unit is poisoned based on its actual conversion efficiency in order to improve the accuracy of SCR poisoning determination.

[0054] S130: Obtain the actual conversion efficiency change trend of the SCR post-treatment device after one regeneration, wherein the actual conversion efficiency change trend is the trend of multiple second actual conversion efficiencies of the SCR post-treatment device for the gas to be treated within a preset temperature range.

[0055] Specifically, the temperature range can be set according to actual conditions, such as temperature range [A, B], where A is 240℃-260℃ and B is 300℃-320℃, etc. Obtaining the actual conversion efficiency change trend of the SCR post-treatment device after one regeneration can help determine whether the SCR post-treatment device has been poisoned.

[0056] S140: Based on the actual conversion efficiency change trend, control the SCR post-processing device to perform secondary regeneration.

[0057] It should be noted that if the actual conversion efficiency shows a decreasing trend, it may indicate a problem with the SCR carrier or poisoning. Therefore, in order to improve the accuracy of poisoning determination, controlling the SCR post-processing device to perform secondary regeneration when the actual conversion efficiency shows a decreasing trend can help improve the accuracy of poisoning determination.

[0058] S150: Based on the multiple third actual conversion efficiencies of the SCR post-treatment device for the gas to be treated after secondary regeneration, a determination result is obtained as to whether the SCR post-treatment device is poisoned.

[0059] Specifically, by obtaining the determination result of whether the SCR post-treatment device is poisoned based on multiple third actual conversion efficiencies of the gas to be treated after secondary regeneration, the accuracy of the poisoning determination of the SCR post-treatment device can be improved.

[0060] It should be mentioned that, in order to protect the engine's SCR aftertreatment device, the first and second regeneration times are usually spaced 12 hours apart to avoid unnecessary damage to the SCR aftertreatment device.

[0061] S160: In the event of poisoning of the SCR aftertreatment device, the temperature of the SCR carrier is raised to a preset target temperature to complete the SCR poisoning treatment and engine thermal management.

[0062] It should be noted that the target temperature is greater than the maximum temperature value of the temperature range, and the target temperature can be 360℃-380℃. Engine thermal management refers to intelligent engine thermal management, which adjusts the flow direction and flow rate of the cooling passage according to different engine operating conditions, so that the engine can operate in the optimal temperature range as much as possible. In step S160, by raising the temperature of the SCR carrier to the preset target temperature through intelligent thermal management in the event of SCR aftertreatment poisoning, the actual conversion efficiency of the SCR aftertreatment device can be improved to a certain extent, thereby minimizing the emission of the gas to be treated by the SCR aftertreatment device, so that the emission of the SCR aftertreatment device meets the standards and avoids the emission of excessive harmful substances. Before the engine is shut down or the vehicle is taken to a service station for maintenance, the aftertreatment is kept in a high-sulfur thermal management state, that is, the temperature of the SCR carrier is raised to the preset target temperature through intelligent thermal management. At the same time, the engine can run normally without interfering with the driver's driving habits, improving the user's driving experience.

[0063] In some embodiments, the step of obtaining the first actual conversion efficiency of the SCR aftertreatment device of the engine for the gas to be treated includes:

[0064] S111: Collect the contents of a first gas to be treated and a second gas to be treated. The first gas to be treated content is the content at the inlet of the SCR aftertreatment device, and the second gas to be treated content is the content at the outlet of the SCR aftertreatment device. The first gas to be treated content is obtained by a gas to be treated content sensor pre-installed at the inlet of the SCR aftertreatment device. The second gas to be treated content is obtained by a gas to be treated content sensor pre-installed at the outlet of the SCR aftertreatment device.

[0065] S112: Based on the content of the first gas to be treated and the content of the second gas to be treated, the first actual conversion efficiency is obtained. Specifically, the difference between the content of the first gas to be treated and the content of the second gas to be treated is obtained, and the ratio of this difference to the content of the first gas to be treated is multiplied by 100% to obtain the first actual conversion efficiency.

[0066] For example, when the gas to be treated is nitrogen oxides, the steps for obtaining the first actual conversion efficiency include: First, collecting the first nitrogen oxide content and the second nitrogen oxide content. The first nitrogen oxide content is the nitrogen oxide content at the inlet of the SCR aftertreatment device, and the second nitrogen oxide content is the nitrogen oxide content at the outlet of the SCR aftertreatment device. The first nitrogen oxide content is obtained by a nitrogen oxide content sensor pre-installed at the inlet of the SCR aftertreatment device. The second nitrogen oxide content is obtained by a nitrogen oxide content sensor pre-installed at the outlet of the SCR aftertreatment device. Then, based on the first nitrogen oxide content and the second nitrogen oxide content, the first actual conversion efficiency is obtained. That is, the difference between the first nitrogen oxide content and the second nitrogen oxide content is obtained, and the ratio of this difference to the first nitrogen oxide content is multiplied by 100% to obtain the first actual conversion efficiency.

[0067] Furthermore, based on the contents of the first gas to be treated and the contents of the second gas to be treated, the mathematical expression for the first actual conversion efficiency is obtained as follows:

[0068]

[0069] Where μ represents the first actual conversion efficiency, NO x_in This indicates the content of the first gas to be treated, NO. x_out This indicates the content of the second gas to be processed.

[0070] It should be noted that the calculation of the calibrated conversion efficiency, the second actual conversion efficiency, the third actual conversion efficiency, the fourth actual conversion efficiency, and the fifth actual conversion efficiency in the following embodiments are all obtained using the above calculation method.

[0071] In some embodiments, the step of obtaining the actual conversion efficiency change trend of the SCR post-treatment device after one regeneration includes:

[0072] S131: According to a preset first acquisition cycle, the temperature of the SCR carrier and the second actual conversion efficiency of the SCR after-treatment device at each temperature are periodically acquired to obtain multiple second actual conversion efficiencies of the SCR after-treatment device within the temperature range. The first acquisition cycle can be set according to actual needs, such as acquiring data once every 10 seconds. The temperature of the SCR carrier is obtained through a temperature sensor preset on the SCR carrier. It should be noted that while acquiring the temperature of the SCR carrier, the second actual conversion efficiency of the SCR after-treatment device at each temperature is also acquired. During the acquisition process, there is no need to interfere with the driver's driving habits, such as forcing the vehicle to drive uphill to increase the temperature or downhill to decrease the temperature. As long as the acquired temperature includes a first temperature value and a second temperature value within the temperature range, multiple second actual conversion efficiencies of the SCR after-treatment device within the temperature range are obtained based on the second actual conversion efficiency corresponding to the first temperature value and the second actual conversion efficiency corresponding to the second temperature value. The first temperature value is the minimum value in the temperature range, and the second temperature value is the maximum value in the temperature range.

[0073] S132: Based on multiple second actual conversion efficiencies, obtain the trend of the actual conversion efficiency change. Obtaining the trend of the actual conversion efficiency change in this step can help in the subsequent determination of SCR post-processing device poisoning.

[0074] In some embodiments, the step of controlling the SCR post-processing device to perform secondary regeneration based on the actual conversion efficiency change trend includes:

[0075] S141: When the actual conversion efficiency shows a decreasing trend, the SCR post-processing device is controlled to perform secondary regeneration.

[0076] In some embodiments, the step of determining whether the SCR post-treatment device is poisoned based on multiple third actual conversion efficiencies of the SCR post-treatment device for the gas to be treated after secondary regeneration includes:

[0077] S151: If the multiple third actual conversion efficiencies show a decreasing trend after secondary regeneration, then according to a preset second acquisition cycle, the temperature of the SCR carrier and the fourth actual conversion efficiency of the SCR post-processing device at each temperature are periodically acquired to obtain multiple fourth actual conversion efficiencies of the SCR post-processing device within the temperature range. It should be noted that, according to the second acquisition cycle, while periodically acquiring the temperature of the SCR carrier, the fourth actual conversion efficiency of the SCR post-processing device at each temperature is also obtained.

[0078] S152: Based on the fourth actual conversion efficiency and the preset calibrated conversion efficiency, the determination result is obtained. The calibrated conversion efficiency corresponds to the fourth actual conversion efficiency, and each calibrated conversion efficiency corresponds to a specific temperature. Step S152, by obtaining the determination result of whether the SCR post-processing device is poisoned based on the fourth actual conversion efficiency and the preset calibrated conversion efficiency, can effectively improve the accuracy of SCR poisoning determination.

[0079] Specifically, the steps for obtaining the calibration conversion efficiency include:

[0080] First, the temperature of the SCR carrier was adjusted to multiple temperatures by starting the engine under various operating conditions (speed, torque, and power, etc.). Second, under each operating condition, a fixed amount of urea solution was injected into the exhaust pipe. Due to the high temperature, the urea solution decomposed into ammonia and carbon dioxide. Simultaneously, the ammonia content was monitored at the outlet of the SCR aftertreatment device to ensure sufficient reaction between the ammonia and the gases to be treated in the exhaust gas. Then, by obtaining the content of the first gas to be treated at the inlet of the SCR aftertreatment device and the content of the second gas to be treated at the outlet of the SCR aftertreatment device, the calibrated conversion efficiency of the SCR aftertreatment device under each operating condition (at different temperatures) was obtained.

[0081] It should be noted that any actual conversion efficiency and its corresponding calibrated conversion efficiency belong to the same operating conditions and correspond to the same urea injection volume and urea concentration.

[0082] Furthermore, the step of obtaining the determination result based on the fourth actual conversion efficiency and the preset calibrated conversion efficiency includes:

[0083] S1521: When the temperature of the SCR carrier is the first temperature value of the temperature range, determine whether the fourth actual conversion efficiency at the first temperature value is less than the corresponding calibrated conversion efficiency. If the fourth actual conversion efficiency is less than the corresponding calibrated conversion efficiency, determine that the SCR post-processing device meets the first determination condition for SCR poisoning. It should be noted that if the fourth actual conversion efficiency is less than the corresponding calibrated conversion efficiency, it can be determined that the current SCR post-processing device is in a relatively low-temperature and inefficient state, thus meeting the first determination condition.

[0084] S1522: When the temperature of the SCR carrier reaches the second temperature value of the temperature range, the SCR post-processing device acquires multiple fifth actual conversion efficiencies within the temperature range, and determines the difference between each fifth actual conversion efficiency and the corresponding calibrated conversion efficiency as an efficiency difference set; the first temperature value is less than the second temperature value.

[0085] S1523: When the difference in the efficiency difference set is decreasing, it is determined that the SCR post-processing device meets the second determination condition for SCR poisoning. That is, when the difference in the efficiency difference set is getting smaller and smaller, it is determined that the current SCR post-processing device is in a state of relatively low temperature and low efficiency, and relatively high temperature and high efficiency, which meets the second determination condition.

[0086] S1524: If the SCR post-processing device is determined to meet the preset target determination conditions at least twice, the determination result of the SCR post-processing device being poisoned is obtained. The target determination conditions are meeting the first determination condition and the second determination condition. It should be noted that if the SCR post-processing device is determined to meet the preset target determination conditions once, the obtained information is SCR poisoning pending confirmation. The above determination process of whether the first and second determination conditions are met needs to be repeated again. The number of repetitions can be set according to the actual situation. If the results obtained from the repetitions are the same, the current SCR post-processing device is determined to be poisoned, thereby improving the accuracy of SCR poisoning determination.

[0087] In some embodiments, in the case of SCR aftertreatment device poisoning, the steps of raising the temperature of the SCR carrier to a preset target temperature to complete SCR poisoning treatment and engine thermal management include:

[0088] S161: In the event of SCR aftertreatment device poisoning, the temperature of the SCR carrier is raised and maintained at the target temperature until the engine stops running, while simultaneously issuing an SCR poisoning alarm. It should be noted that by raising and maintaining the temperature of the SCR carrier at the target temperature until the engine stops running, while simultaneously issuing an SCR poisoning alarm, the amount of gas to be treated by the SCR aftertreatment device can be minimized, ensuring that the emissions of the gas to be treated meet standards. This does not require intervention in the driver's driving habits. Furthermore, the timely warning method can maximize the protection of the SCR carrier, minimizing the prolonged poisoning time of the SCR aftertreatment device and preventing the poisoning situation from worsening, effectively reducing user maintenance costs.

[0089] The engine thermal management system provided by the present invention is described below. The engine thermal management system described below can be referred to in correspondence with the engine thermal management method described above.

[0090] Please refer to Figure 2 The engine thermal management system provided in this embodiment includes:

[0091] The first actual conversion efficiency acquisition module 210 is used to acquire the first actual conversion efficiency of the SCR aftertreatment device of the engine for the gas to be treated in the exhaust gas.

[0092] The primary regeneration module 220 is used to control the SCR post-processing device to perform a primary regeneration when the first actual conversion efficiency is less than a preset conversion efficiency threshold.

[0093] The trend acquisition module 230 is used to acquire the actual conversion efficiency change trend of the SCR after-treatment device after one regeneration. The actual conversion efficiency change trend is the trend of multiple second actual conversion efficiencies of the SCR after-treatment device for the gas to be treated within a preset temperature range.

[0094] The secondary regeneration module 240 is used to control the SCR post-processing device to perform secondary regeneration based on the actual conversion efficiency change trend.

[0095] The poisoning determination module 250 is used to determine whether the SCR post-treatment device is poisoned based on multiple third actual conversion efficiencies of the SCR post-treatment device for the gas to be treated after secondary regeneration.

[0096] The thermal management module 260 is used to raise the temperature of the SCR carrier to a preset target temperature in the event of SCR aftertreatment device poisoning, thereby completing SCR poisoning treatment and engine thermal management. The first actual conversion efficiency acquisition module 210, the primary regeneration module 220, the change trend acquisition module 230, the secondary regeneration module 240, the poisoning determination module 250, and the thermal management module 260 are connected. The engine thermal management system in this embodiment can accurately determine whether the SCR aftertreatment device is poisoned, with high precision. Furthermore, by raising the temperature of the SCR carrier through thermal management to complete SCR poisoning treatment, the system can ensure that the emissions of the gas to be treated meet standards as much as possible in the event of SCR aftertreatment device poisoning, without changing vehicle operating conditions or interfering with driver operation, effectively improving the driving experience.

[0097] In some embodiments, the trend acquisition module 230 is specifically used to periodically collect the temperature of the SCR carrier and the second actual conversion efficiency of the SCR post-processing device at each temperature according to a preset first acquisition cycle, so as to obtain multiple second actual conversion efficiencies of the SCR post-processing device within the temperature range.

[0098] Based on multiple second actual conversion efficiencies, the trend of the actual conversion efficiency is obtained.

[0099] In some embodiments, the secondary regeneration module 240 is specifically used to control the SCR post-processing device to perform secondary regeneration when the actual conversion efficiency shows a decreasing trend.

[0100] In some embodiments, the poisoning determination module 250 includes:

[0101] The fourth actual conversion efficiency acquisition unit is used to periodically collect the temperature of the SCR carrier and the fourth actual conversion efficiency of the SCR post-processing device at each temperature according to a preset second acquisition cycle if the multiple third actual conversion efficiencies show a decreasing trend after secondary regeneration, so as to obtain the multiple fourth actual conversion efficiencies of the SCR post-processing device within the temperature range.

[0102] The determination unit is used to obtain the determination result based on the fourth actual conversion efficiency and the preset calibrated conversion efficiency. The calibrated conversion efficiency and the fourth actual conversion efficiency have a corresponding relationship, and each calibrated conversion efficiency corresponds to a corresponding temperature.

[0103] In some embodiments, the determination unit is specifically used to determine whether the fourth actual conversion efficiency at the first temperature value is less than the corresponding calibrated conversion efficiency when the temperature of the SCR carrier is the first temperature value of the temperature range, and to determine that the SCR post-processing device meets the first determination condition of SCR poisoning when the fourth actual conversion efficiency is less than the corresponding calibrated conversion efficiency.

[0104] When the temperature of the SCR carrier reaches the second temperature value of the temperature range, multiple fifth actual conversion efficiencies of the SCR post-processing device within the temperature range are obtained, and the difference between each fifth actual conversion efficiency and the corresponding calibrated conversion efficiency is determined as an efficiency difference set; the first temperature value is less than the second temperature value.

[0105] If the difference in the efficiency difference set is decreasing, the SCR post-processing device is determined to meet the second criterion for SCR poisoning.

[0106] If the SCR post-processing device is determined to meet the preset target determination conditions at least twice, the determination result of the SCR post-processing device being poisoned is obtained, wherein the target determination conditions are the satisfaction of the first determination condition and the second determination condition.

[0107] In some embodiments, the thermal management module 206 is specifically used to raise and maintain the temperature of the SCR carrier at the target temperature in the event of poisoning of the SCR aftertreatment device, until the engine stops running, while issuing an SCR poisoning alarm.

[0108] Figure 3 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 3As shown, the electronic device may include: a processor 310, a communication interface 320, a memory 330, and a communication bus 340, wherein the processor 310, the communication interface 320, and the memory 330 communicate with each other through the communication bus 340. The processor 310 can call logic instructions in the memory 330 to execute an engine thermal management method, which includes: obtaining a first actual conversion efficiency of the engine's SCR aftertreatment device for the gas to be treated in the exhaust gas; controlling the SCR aftertreatment device to perform a first regeneration when the first actual conversion efficiency is less than a preset conversion efficiency threshold; obtaining the actual conversion efficiency change trend of the SCR aftertreatment device after the first regeneration, wherein the actual conversion efficiency change trend is the trend formed by multiple second actual conversion efficiencies of the SCR aftertreatment device for the gas to be treated within a preset temperature range; controlling the SCR aftertreatment device to perform a second regeneration based on the actual conversion efficiency change trend; obtaining a determination result of whether the SCR aftertreatment device is poisoned based on multiple third actual conversion efficiencies of the SCR aftertreatment device for the gas to be treated after the second regeneration; and raising the temperature of the SCR carrier to a preset target temperature when the SCR aftertreatment device is poisoned to complete the SCR poisoning treatment and engine thermal management.

[0109] Furthermore, the logical instructions in the aforementioned memory 330 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0110] This embodiment also provides an engine, including an SCR aftertreatment device and the electronic equipment described above. The engine in this embodiment can accurately determine whether the SCR aftertreatment device is poisoned, with high precision. Furthermore, by increasing the temperature of the SCR carrier through thermal management to complete the SCR poisoning treatment, it can ensure that the emissions of the gas to be treated meet standards as much as possible even when the SCR aftertreatment device is poisoned, without altering vehicle operation or interfering with driver operation, effectively improving the driving experience and offering high flexibility.

[0111] This embodiment also provides a vehicle, including the engine as described above. The vehicle in this embodiment can accurately determine whether the SCR aftertreatment device is poisoned, with high precision. Furthermore, by increasing the temperature of the SCR carrier through thermal management to complete the SCR poisoning treatment, it can ensure that the emissions of the gas to be treated meet the standards as much as possible even when the SCR aftertreatment device is poisoned, without changing the vehicle's operating conditions or intervening in the driver's driving, effectively improving the driving experience.

[0112] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the engine thermal management method provided in the above embodiments. The method includes: obtaining a first actual conversion efficiency of the engine's SCR aftertreatment device for a gas to be treated in the exhaust gas; controlling the SCR aftertreatment device to perform a single regeneration when the first actual conversion efficiency is less than a preset conversion efficiency threshold; obtaining a trend of actual conversion efficiency change of the SCR aftertreatment device after the single regeneration, the actual conversion efficiency change trend being a trend formed by multiple second actual conversion efficiencies of the SCR aftertreatment device for the gas to be treated within a preset temperature range; controlling the SCR aftertreatment device to perform a second regeneration based on the actual conversion efficiency change trend; obtaining a determination result of whether the SCR aftertreatment device is poisoned based on multiple third actual conversion efficiencies of the SCR aftertreatment device for the gas to be treated after the second regeneration; and, in the case of SCR aftertreatment device poisoning, raising the temperature of the SCR carrier to a preset target temperature to complete SCR poisoning treatment and engine thermal management.

[0113] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0114] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An engine thermal management method, characterized in that, include: Obtain the first actual conversion efficiency of the gas to be treated by the SCR aftertreatment device of the engine; If the first actual conversion efficiency is less than the preset conversion efficiency threshold, the SCR post-processing device is controlled to perform one regeneration. The actual conversion efficiency change trend of the SCR after-treatment device after one regeneration is obtained. The actual conversion efficiency change trend is the trend of multiple second actual conversion efficiencies of the SCR after-treatment device for the gas to be treated within a preset temperature range. Based on the actual conversion efficiency change trend, the SCR post-processing device is controlled to perform secondary regeneration. Based on the multiple third actual conversion efficiencies of the SCR post-treatment device for the gas to be treated after secondary regeneration, the determination result of whether the SCR post-treatment device is poisoned is obtained. In the event of poisoning of the SCR aftertreatment device, the temperature of the SCR carrier is raised to a preset target temperature to complete the SCR poisoning treatment and engine thermal management.

2. The engine thermal management method according to claim 1, characterized in that, The steps for obtaining the actual conversion efficiency change trend of the SCR after one regeneration include: According to a preset first acquisition cycle, the temperature of the SCR carrier and the second actual conversion efficiency of the SCR post-processing device at each temperature are periodically acquired to obtain multiple second actual conversion efficiencies of the SCR post-processing device within the temperature range. Based on multiple second actual conversion efficiencies, the trend of the actual conversion efficiency is obtained.

3. The engine thermal management method according to claim 1, characterized in that, Based on the actual conversion efficiency change trend, the steps for controlling the SCR post-processing device to perform secondary regeneration include: When the actual conversion efficiency shows a decreasing trend, the SCR post-processing device is controlled to perform secondary regeneration.

4. The engine thermal management method according to claim 1, characterized in that, The steps for determining whether the SCR post-treatment device is poisoned, based on multiple third actual conversion efficiencies of the SCR post-treatment device for the gas to be treated after secondary regeneration, include: If the multiple third actual conversion efficiencies show a decreasing trend after secondary regeneration, the temperature of the SCR carrier and the fourth actual conversion efficiency of the SCR post-processing device at each temperature are periodically collected according to the preset second collection cycle, so as to obtain the multiple fourth actual conversion efficiencies of the SCR post-processing device within the temperature range. The determination result is obtained based on the fourth actual conversion efficiency and the preset calibrated conversion efficiency. The calibrated conversion efficiency and the fourth actual conversion efficiency have a corresponding relationship, and each calibrated conversion efficiency corresponds to a corresponding temperature.

5. The engine thermal management method according to claim 4, characterized in that, The steps for obtaining the determination result based on the fourth actual conversion efficiency and the preset calibrated conversion efficiency include: When the temperature of the SCR carrier is the first temperature value of the temperature range, it is determined whether the fourth actual conversion efficiency at the first temperature value is less than the corresponding calibrated conversion efficiency. If the fourth actual conversion efficiency is less than the corresponding calibrated conversion efficiency, it is determined that the SCR post-processing device meets the first determination condition of SCR poisoning. When the temperature of the SCR carrier reaches the second temperature value of the temperature range, multiple fifth actual conversion efficiencies of the SCR post-processing device within the temperature range are obtained, and the difference between each fifth actual conversion efficiency and the corresponding calibrated conversion efficiency is determined as an efficiency difference set; the first temperature value is less than the second temperature value. If the difference in the efficiency difference set is decreasing, the SCR post-processing device is determined to meet the second criterion for SCR poisoning. If the SCR post-processing device is determined to meet the preset target determination conditions at least twice, the determination result of the SCR post-processing device being poisoned is obtained, wherein the target determination conditions are the satisfaction of the first determination condition and the second determination condition.

6. The engine thermal management method according to any one of claims 1 to 5, characterized in that, In the event of SCR aftertreatment device poisoning, the steps of raising the temperature of the SCR carrier to a preset target temperature to complete SCR poisoning treatment and engine thermal management include: In the event of poisoning of the SCR aftertreatment device, the temperature of the SCR carrier is raised and maintained at the target temperature until the engine stops running, while an SCR poisoning alarm is issued.

7. An engine thermal management system, characterized in that, include: The first actual conversion efficiency acquisition module is used to acquire the first actual conversion efficiency of the gas to be treated by the SCR aftertreatment device of the engine. A primary regeneration module is used to control the SCR post-processing device to perform a primary regeneration when the first actual conversion efficiency is less than a preset conversion efficiency threshold. The trend acquisition module is used to acquire the actual conversion efficiency change trend of the SCR after-treatment device after one regeneration. The actual conversion efficiency change trend is the trend of multiple second actual conversion efficiencies of the SCR after-treatment device for the gas to be treated within a preset temperature range. The secondary regeneration module is used to control the SCR post-processing device to perform secondary regeneration based on the actual conversion efficiency change trend. The poisoning determination module is used to determine whether the SCR post-treatment device is poisoned based on multiple third actual conversion efficiencies of the SCR post-treatment device for the gas to be treated after secondary regeneration. The thermal management module is used to raise the temperature of the SCR carrier to a preset target temperature in the event of poisoning of the SCR aftertreatment device, so as to complete the SCR poisoning treatment and engine thermal management.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the engine thermal management method as described in any one of claims 1 to 6.

9. An engine, characterized in that, include: The SCR post-processing apparatus and the electronic device as described in claim 8.

10. A vehicle, characterized in that, include: The engine as described in claim 9.

11. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the engine thermal management method as described in any one of claims 1 to 6.

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