Engine ammonia-blended combustion control method and related equipment

Abstract

This application discloses an ammonia-blended combustion control method and related equipment for engines, relating to the field of diesel-ammonia engine technology. The method includes: when a first ammonia sensor and a first nitrogen oxide sensor are activated, continuously injecting liquid ammonia according to a first ammonia blending ratio during engine operation; acquiring a first ammonia concentration value and a first nitrogen-based gas concentration value through the first ammonia sensor and the first nitrogen oxide sensor; calculating the difference between the first nitrogen-based gas concentration value and the first ammonia concentration value to obtain the nitrogen oxide concentration value; continuing to inject liquid ammonia during engine operation when the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value; otherwise, stopping the injection of liquid ammonia during engine operation. This application dynamically adjusts the ammonia injection amount by real-time monitoring of ammonia and nitrogen oxide concentrations, avoiding excessive ammonia blending leading to leakage and excessive emissions, thereby optimizing energy utilization efficiency and reducing the cost of liquid ammonia consumption.

Description

Technical Field

[0001] This application relates to the field of diesel-ammonia engine technology, and more specifically, to an engine ammonia-blended combustion control method and related equipment. Background Technology

[0002] With the continuous development of engine combustion technology, ammonia, as a potentially high-potential zero-carbon alternative fuel, has gradually attracted widespread attention due to its advantages in emission reduction and sustainability. Ammonia combustion in engines suffers from slow speed and low temperature, thus requiring ignition fuel. Currently, a common method is co-firing it with diesel fuel. Ammonia co-firing technology improves combustion efficiency and reduces NOx emissions. x It is of great significance in terms of emissions and achieving carbon neutrality goals; however, due to the special characteristics of ammonia combustion, its application in engines faces many technical challenges, especially in terms of co-firing ratio control and exhaust emission treatment. How to balance the contradiction between efficient combustion and low emissions has become the focus of technical research.

[0003] In existing technologies, control methods for ammonia-blended combustion in engines mostly employ fixed ammonia blending ratios or simple single-parameter-based control methods. While these methods achieve basic ammonia-blended combustion functionality, they often fail to adequately handle complex operating conditions in practical applications. In particular, unburned ammonia gas (NH3) produced during ammonia combustion may enter the exhaust aftertreatment system with the exhaust, leading to excessive emissions. Furthermore, existing technologies are mostly based on traditional NO... x Sensors monitor and control exhaust emissions, but NO... x The sensor cannot distinguish between ammonia (NH3) and nitrogen oxides (NO). x This technological bottleneck makes it difficult to precisely adjust the ammonia blending ratio, thus limiting the effectiveness of emission control strategies. In other words, existing technologies suffer from poor adaptability to complex operating conditions in ammonia-blended combustion control methods for engines, insufficient precision in ammonia blending ratio adjustment, and low efficiency in exhaust emission treatment. Summary of the Invention

[0004] The summary section of this application introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this application is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] The engine ammonia combustion control method and related device provided in this application can dynamically adjust the ammonia injection amount by real-time monitoring of ammonia and nitrogen oxide concentrations, thereby avoiding excessive ammonia mixing leading to leakage and excessive emissions, thus optimizing energy utilization efficiency and reducing liquid ammonia consumption costs.

[0006] In a first aspect, this application provides an engine ammonia-blended combustion control method, comprising: when a first ammonia sensor and a first nitrogen oxide sensor are in an activated state, continuously injecting liquid ammonia according to a first ammonia blending ratio during engine operation, wherein the first ammonia sensor and the first nitrogen oxide sensor are both disposed at the inlet end of an exhaust aftertreatment component; obtaining a first ammonia concentration value and a first nitrogen-based gas concentration value through the first ammonia sensor and the first nitrogen oxide sensor; calculating the difference between the first nitrogen-based gas concentration value and the first ammonia concentration value to obtain a nitrogen oxide concentration value; continuing to inject the liquid ammonia during engine operation when the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value; and stopping the injection of the liquid ammonia during engine operation when the first ammonia concentration value is greater than the nitrogen oxide concentration value.

[0007] In one feasible implementation, the step of continuing to inject liquid ammonia during engine operation when the first ammonia concentration is less than or equal to the nitrogen oxide concentration includes: when the first ammonia concentration is less than or equal to the nitrogen oxide concentration and the first ammonia concentration is less than or equal to a first concentration value, continuing to inject liquid ammonia during engine operation according to the first ammonia blending ratio; when the first ammonia concentration is less than or equal to the nitrogen oxide concentration, the first ammonia concentration is greater than the first concentration value, and the first ammonia concentration is less than or equal to a second concentration value, continuing to inject liquid ammonia during engine operation according to a second ammonia blending ratio, wherein the second concentration value is greater than the first concentration value. The concentration values ​​are as follows: the second ammonia blending ratio is less than the first ammonia blending ratio; when the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value, the first ammonia concentration value is greater than the second concentration value, and the first ammonia concentration value is less than or equal to the third concentration value, the liquid ammonia continues to be injected during engine operation according to the third ammonia blending ratio, wherein the third concentration value is greater than the second concentration value, and the third ammonia blending ratio is less than the second ammonia blending ratio; when the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value, and the first ammonia concentration value is greater than the third concentration value, the liquid ammonia continues to be injected during engine operation according to the fourth ammonia blending ratio, wherein the fourth ammonia blending ratio is less than the third ammonia blending ratio.

[0008] In one feasible implementation, the first concentration value, the second concentration value, and the third concentration value respectively correspond to different measurement accuracy thresholds of the first nitrogen oxide sensor.

[0009] In one feasible implementation, the first concentration value, the second concentration value, and the third concentration value are set in a proportionally increasing manner.

[0010] In one feasible implementation, stopping the injection of liquid ammonia during engine operation when the first ammonia concentration value is greater than the nitrogen oxide concentration value includes: stopping the injection of liquid ammonia during engine operation when the first ammonia concentration value is greater than the nitrogen oxide concentration value and the second ammonia concentration value is greater than the fourth concentration value, wherein the second ammonia concentration value is the ammonia concentration value output by the exhaust gas aftertreatment component.

[0011] In one feasible implementation, after calculating the difference between the first nitrogen-based gas concentration value and the first ammonia concentration value to obtain the nitrogen oxide concentration value, the engine ammonia-blended combustion control method further includes: obtaining the second ammonia concentration value through a second ammonia sensor, wherein the second ammonia sensor is disposed at the outlet end of the exhaust gas aftertreatment component.

[0012] In one feasible implementation, after calculating the difference between the first nitrogen-based gas concentration value and the first ammonia concentration value to obtain the nitrogen oxide concentration value, the engine ammonia-blended combustion control method further includes: calculating the second ammonia concentration value based on the nitrogen oxide reduction efficiency of the exhaust aftertreatment component, the first ammonia concentration value, the first nitrogen-based gas concentration value, and the second nitrogen-based gas concentration value, wherein the second nitrogen-based gas concentration value is obtained by a second ammonia oxide sensor, and the second ammonia oxide sensor is disposed at the outlet end of the exhaust aftertreatment component.

[0013] Secondly, this application also provides an engine ammonia-blended combustion control device, comprising: an ammonia-blended combustion unit, configured to continuously inject liquid ammonia according to a first ammonia blending ratio during engine operation when a first ammonia sensor and a first nitrogen oxide sensor are in an activated state, wherein the first ammonia sensor and the first nitrogen oxide sensor are both disposed at the inlet end of an exhaust aftertreatment component; a concentration acquisition unit, configured to acquire a first ammonia concentration value and a first nitrogen-based gas concentration value through the first ammonia sensor and the first nitrogen oxide sensor; a concentration calculation unit, configured to calculate the difference between the first nitrogen-based gas concentration value and the first ammonia concentration value to obtain a nitrogen oxide concentration value; an ammonia blending judgment unit, configured to continue injecting the liquid ammonia during engine operation when the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value; and the ammonia blending judgment unit is further configured to stop injecting the liquid ammonia during engine operation when the first ammonia concentration value is greater than the nitrogen oxide concentration value.

[0014] Thirdly, this application also provides an electronic device, including: a memory and a processor, wherein the processor is configured to execute a computer program stored in the memory to implement the steps of the engine ammonia-blended combustion control method described in the first aspect.

[0015] Fourthly, this application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the engine ammonia-blended combustion control method described in the first aspect.

[0016] Fifthly, this application also provides a computer program product, including a computer program or computer-executable instructions, which, when executed by a processor, implement the engine ammonia-blended combustion control method provided in the embodiments of this application.

[0017] In summary, this application, through the cooperation of a first ammonia sensor and a first nitrogen oxide sensor, can accurately determine the generation of first ammonia and first nitrogen-based gas during combustion and control them based on real-time changes in their concentrations. This effectively avoids ammonia leakage caused by excessive ammonia blending. When the first ammonia concentration is greater than the nitrogen oxide concentration, it indicates that there may be excessive ammonia, and the injection of liquid ammonia is stopped, thereby avoiding unnecessary ammonia leakage and excessive emissions. This not only avoids the waste of excessive ammonia blending but also reduces the consumption cost of liquid ammonia, reducing unnecessary ammonia consumption and helping to optimize overall energy utilization efficiency. In conclusion, the engine ammonia blending combustion control method provided by this application, by monitoring the concentrations of ammonia and nitrogen oxides in real time and dynamically adjusting the ammonia injection amount, avoids leakage and excessive emissions caused by excessive ammonia blending, thereby optimizing energy utilization efficiency and reducing the consumption cost of liquid ammonia. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit this specification. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0019] Figure 1 A schematic flowchart illustrating an engine ammonia-blended combustion control method provided in this application embodiment;

[0020] Figure 2 This is a schematic diagram of the composition structure of an engine ammonia-blended combustion control device provided in an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the composition structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0022] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and not to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein. Furthermore, the terms “is” and “has,” and any variations thereof, used in this application are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0023] In this application, the terms "module" or "unit" refer to a computer program or part of a computer program that has a predetermined function and works with other related parts to achieve a predetermined goal, and can be implemented, wholly or partially, using software, hardware (such as processing circuitry or memory), or a combination thereof. Similarly, a processor (or multiple processors or memory) can be used to implement one or more modules or units. Furthermore, each module or unit can be part of a larger module or unit that includes the functionality of that module or unit.

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. In the following description, "some embodiments" are referred to, which describes a subset of all possible embodiments. However, it is understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0025] See Figure 1 , Figure 1 This is a flowchart illustrating an ammonia-blended combustion control method for an engine provided in an embodiment of this application. The method may specifically include the following steps 101 to 105:

[0026] Step 101: When the first ammonia sensor and the first nitrogen oxide sensor are in the start-up state, liquid ammonia is continuously injected during engine operation according to the first ammonia blending ratio, wherein the first ammonia sensor and the first nitrogen oxide sensor are both located at the inlet end of the exhaust gas aftertreatment component.

[0027] Specifically, the first ammonia sensor is a sensor used to measure the concentration of ammonia (NH3), which is installed at the inlet of the exhaust aftertreatment component. Its function is to monitor the ammonia concentration in the engine exhaust in real time so as to correct the ammonia blending ratio according to the actual ammonia emission. The first nitrogen oxide sensor is a sensor used to measure the concentration of nitrogen oxides (NOx), which is also installed at the inlet of the exhaust aftertreatment component. Its function is to monitor the nitrogen oxide concentration in the engine exhaust so as to cooperate with the ammonia sensor to achieve closed-loop control of ammonia and nitrogen oxide emissions. The first ammonia blending ratio is the ratio of ammonia to fuel blending and combustion according to the preset mixing ratio of ammonia and fuel when the engine is initially running. This ratio is set when the engine starts running. Exhaust aftertreatment components are an important part of the engine exhaust system, and can include selective catalytic reduction (SCR) systems and ammonia slip catalysts (ASC), etc.; in contrast, exhaust pretreatment components can include selective catalytic reduction (SCR) systems, ammonia slip catalysts (ASC), diesel oxidation catalysts (DOC), and diesel particulate filters (DPF), etc.

[0028] For example, during engine operation, liquid ammonia will be continuously injected into the engine according to a preset first ammonia blending ratio only when it is detected that the first ammonia sensor and the first nitrogen oxide sensor have been successfully started and are in normal working condition. Before the first ammonia sensor and the first nitrogen oxide sensor are started, dew point release will also be performed. Dew point release refers to the process of evaporating the water that may condense inside the sensor by heating or other methods to ensure that the sensor can accurately measure the concentration of the target gas without being affected by water condensation.

[0029] By implementing step 101, it is possible to ensure that the key components (first ammonia concentration value and first nitrogen-based gas concentration value) in the exhaust gas are monitored before the ammonia-blended combustion process begins. This effectively avoids the problem of uncontrolled ammonia blending ratio caused by sensor failure or incomplete data, thereby ensuring the stability of the combustion process and the accuracy of exhaust gas emission control.

[0030] Step 102: Obtain the first ammonia concentration value and the first nitrogen-based gas concentration value through the first ammonia sensor and the first nitrogen oxide sensor;

[0031] Specifically, the first ammonia concentration value is the concentration of ammonia (NH3) in the exhaust gas measured and obtained by the first ammonia sensor. This concentration value reflects the actual residual amount of ammonia in the engine's ammonia-blended combustion and exhaust emissions, and is an important parameter for evaluating the ammonia-blended combustion effect and exhaust gas treatment efficiency. Because ammonia has a high auto-ignition temperature and a slow combustion rate, its unburned portion may enter the exhaust aftertreatment components with the exhaust gas. Therefore, by monitoring the ammonia concentration in real time, NH3 leakage problems can be effectively identified and controlled, preventing its excessive emissions into the environment. The first nitrogen-based gas concentration value is the concentration of nitrogen-based gases (mainly nitrogen oxides, NO) in the exhaust gas measured and obtained by the first nitrogen oxide sensor. x Concentration value of NO; x NO (nitrogen oxides) and NO2 (nitrogen dioxide) are among the main pollutants generated during engine combustion.

[0032] By implementing step 102, key parameters are provided for controlling the ammonia blending ratio during the combustion process. The dynamically monitored data covers the concentration changes of ammonia and nitrogen oxides, enabling the system to fully grasp the combustion and emission situation, thus laying the foundation for subsequent precise control.

[0033] Step 103: Calculate the difference between the first nitrogen-based gas concentration value and the first ammonia gas concentration value to obtain the nitrogen oxide concentration value;

[0034] Specifically, the nitrogen oxide concentration value is the nitrogen oxide (NOx) in the exhaust gas. x The value reflects the actual concentration of nitrogen oxides (NO and NO2), eliminating the interference of ammonia (NH3) in the nitrogen oxide sensor readings and accurately reflecting the amount of nitrogen oxides emitted after engine combustion.

[0035] By implementing step 103, the difference between the first nitrogen-based gas concentration value and the first ammonia concentration value is calculated, clarifying the actual concentration of nitrogen oxides. This compensates for the sensor's inability to directly distinguish between ammonia and nitrogen oxides, improves the reliability and accuracy of the data, provides an accurate basis for real-time adjustment of the ammonia blending ratio, and enhances the precision of exhaust emission control.

[0036] Step 104: When the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value, continue to inject liquid ammonia during engine operation;

[0037] Specifically, when the first ammonia concentration is lower than or equal to the nitrogen oxide concentration, it indicates that the NO in the exhaust gas is high. x The content is still high, and NH3 is not enough to completely eliminate NO. x The reduction reaction requires more NH3 to participate in the exhaust aftertreatment component to reduce NO. x To reduce emissions, liquid ammonia is continuously injected into the engine. This ensures NO emissions.x Maintaining a reasonable balance with NH3, and increasing NO in exhaust gases x Reduce reduction efficiency to avoid exceeding emission standards.

[0038] Step 105: When the first ammonia concentration value is greater than the nitrogen oxide concentration value, stop injecting liquid ammonia during engine operation;

[0039] Specifically, when the concentration of ammonia is higher than that of nitrogen oxides, it means that the concentration of NH3 in the exhaust gas aftertreatment component exceeds that of NO. x If the required reduction amount results in an excessive injection of NH3, and the injection of liquid ammonia continues, it may cause NH3 to leak downstream of the exhaust gas after-treatment system or even be emitted into the atmosphere, resulting in excessive ammonia emissions in the exhaust gas.

[0040] By implementing step 105, excessive ammonia emissions were avoided, the normal operation of the exhaust gas aftertreatment components was protected, their service life was extended, and the economic efficiency of system resource utilization was improved.

[0041] In summary, this application, through the cooperation of a first ammonia sensor and a first nitrogen oxide sensor, can accurately determine the generation of first ammonia and first nitrogen-based gas during combustion and control them based on real-time changes in their concentrations. This effectively avoids ammonia leakage caused by excessive ammonia blending. When the first ammonia concentration is greater than the nitrogen oxide concentration, it indicates that there may be excessive ammonia, and the injection of liquid ammonia is stopped, thereby avoiding unnecessary ammonia leakage and excessive emissions. This not only avoids the waste of excessive ammonia blending but also reduces the consumption cost of liquid ammonia, reducing unnecessary ammonia consumption and helping to optimize overall energy utilization efficiency. In conclusion, the engine ammonia blending combustion control method provided by this application, by monitoring the concentrations of ammonia and nitrogen oxides in real time and dynamically adjusting the ammonia injection amount, avoids leakage and excessive emissions caused by excessive ammonia blending, thereby optimizing energy utilization efficiency and reducing the consumption cost of liquid ammonia.

[0042] In some embodiments, step 104 may include: when the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value, and the first ammonia concentration value is less than or equal to the first concentration value, continuing to inject liquid ammonia according to the first ammonia blending ratio during engine operation; when the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value, the first ammonia concentration value is greater than the first concentration value, and the first ammonia concentration value is less than or equal to the second concentration value, continuing to inject liquid ammonia according to the second ammonia blending ratio during engine operation, wherein the second concentration value is greater than the first concentration value, and the second ammonia blending ratio is less than the first ammonia blending ratio. The proportions are as follows: When the first ammonia concentration is less than or equal to the nitrogen oxide concentration, the first ammonia concentration is greater than the second concentration, and the first ammonia concentration is less than or equal to the third concentration, liquid ammonia continues to be injected during engine operation according to the third ammonia blending ratio, wherein the third concentration is greater than the second concentration and the third ammonia blending ratio is less than the second ammonia blending ratio; when the first ammonia concentration is less than or equal to the nitrogen oxide concentration, and the first ammonia concentration is greater than the third concentration, liquid ammonia continues to be injected during engine operation according to the fourth ammonia blending ratio, wherein the fourth ammonia blending ratio is less than the third ammonia blending ratio.

[0043] Specifically, the first, second, and third concentration values ​​are graded thresholds set based on the range of change in ammonia concentration in the exhaust gas (first ammonia concentration value). These thresholds are used to determine the current NH3 concentration level and to decide on the adjustment of the liquid ammonia injection ratio. The first concentration value is the lowest threshold, indicating that the ammonia concentration is still at a low level, and the first ammonia blending ratio needs to be maintained to meet NO requirements. x The reduction reaction requires a certain concentration. The second concentration value is the intermediate threshold, slightly higher than the first concentration value, indicating an increase in ammonia concentration. At this point, the ammonia blending ratio needs to be reduced to avoid excessive NH3. The third concentration value is the highest threshold, significantly higher than the first and second concentration values, approaching the upper limit of acceptable ammonia concentration. The ammonia blending ratio needs to be reduced again to maintain concentration balance. The second, third, and fourth ammonia blending ratios correspond to the liquid ammonia injection ratios for different concentration ranges.

[0044] For example, in the case of an ammonia-diesel engine in a long-haul truck, under low load and low speed operation (e.g., urban driving), the exhaust gas temperature is low, the combustion and reaction rate of ammonia is slow, and the initial ammonia concentration value is lower than or equal to the initial concentration value, indicating that NH3 is still insufficient to fully reduce NO. x Therefore, liquid ammonia is injected according to the first ammonia doping ratio to maintain the necessary reduction reaction and ensure NO xEmissions are within the prescribed range. When the vehicle is traveling at medium speed (such as low-load cruising on a highway), the exhaust temperature rises, and the concentration of unburned NH3 may gradually approach the second concentration value. The liquid ammonia injection amount is adjusted to the second ammonia blending ratio to reduce the amount of ammonia injected to avoid excessive NH3 while maintaining sufficient reduction reaction efficiency. When the vehicle is fully loaded and traveling at high speed, the engine combustion intensity increases, and the NH3 concentration in the exhaust gas may approach or exceed the second concentration value but be lower than the third concentration value. Liquid ammonia is injected according to the third ammonia blending ratio to further reduce the amount of ammonia injected, prevent NH3 leakage, and maintain the efficient operation of the SCR system. Under extremely high load or sudden acceleration conditions (such as climbing a hill or emergency acceleration), the NH3 concentration in the exhaust gas may exceed the third concentration value. The amount of liquid ammonia injected is significantly reduced according to the fourth ammonia blending ratio to avoid serious NH3 leakage while ensuring the stable operation of the exhaust gas treatment system.

[0045] By implementing the above embodiments, and adopting a graded ammonia blending ratio control method (from the first ammonia blending ratio to the fourth ammonia blending ratio) according to different ammonia concentration ranges, the amount of ammonia blended during the combustion process can be adjusted more precisely, enabling the combustion control to adapt to various operating conditions and improving combustion efficiency and exhaust gas treatment effect.

[0046] In some embodiments, the first concentration value, the second concentration value, and the third concentration value correspond to different measurement accuracy thresholds of the first nitrogen oxide sensor.

[0047] For example, a first concentration value of 25 ppm corresponds to a relatively high accuracy range for the first nitrogen oxide sensor (error ±10%); when the first ammonia concentration value is ≤ the first concentration value, liquid ammonia is injected according to a first ammonia doping ratio (e.g., 50%). A second concentration value of 50 ppm corresponds to a medium accuracy range for the sensor (error ±20%); when the first ammonia concentration value is between the first and second concentration values, liquid ammonia is injected according to a second ammonia doping ratio (e.g., 40%). A third concentration value of 100 ppm corresponds to a relatively low accuracy range for the sensor (error ±50%); when the first ammonia concentration value is between the second and third concentration values, liquid ammonia is injected according to a third ammonia doping ratio (e.g., 30%).

[0048] Through the implementation of the above embodiments, the first concentration value, the second concentration value, and the third concentration value correspond to the measurement accuracy threshold of the sensor, ensuring the scientific and rational nature of the ammonia blending ratio adjustment; and by setting the correspondence between the concentration value range and the sensor accuracy, the influence of measurement error on the ammonia blending ratio adjustment can be reduced, and the reliability of combustion control can be improved.

[0049] In some embodiments, the first concentration value, the second concentration value, and the third concentration value are set in a proportionally increasing manner.

[0050] For example, a first concentration value of 20 ppm is used as the basic concentration threshold for ammonia blending control; when the first ammonia concentration value is less than or equal to the first concentration value, liquid ammonia is injected at a first blending ratio (e.g., 60%). A second concentration value of 40 ppm is twice the first concentration value; when the first ammonia concentration value is between the first and second concentration values, liquid ammonia is injected at a second blending ratio (e.g., 45%). A third concentration value of 80 ppm is twice the second concentration value; when the first ammonia concentration value is between the second and third concentration values, liquid ammonia is injected at a third blending ratio (e.g., 25%).

[0051] By implementing the above embodiments, the method of setting concentration values ​​is simplified by setting the first concentration value, the second concentration value and the third concentration value in a proportionally increasing manner, the segmented adjustment strategy is optimized, the smoothness of the ammonia blending ratio adjustment is ensured, the gradual adjustment of the ammonia blending ratio is ensured, and the fluctuation of combustion efficiency caused by sudden changes is avoided.

[0052] In some embodiments, step 105 may include: stopping the injection of liquid ammonia during engine operation when the first ammonia concentration value is greater than the nitrogen oxide concentration value and the second ammonia concentration value is greater than the fourth concentration value, wherein the second ammonia concentration value is the ammonia concentration value output by the exhaust aftertreatment component.

[0053] Specifically, when the ammonia concentration exceeds the nitrogen oxide concentration, it indicates that the ammonia in the exhaust gas is excessive, compared to NO. x The actual concentration indicates that no further injection of liquid ammonia is needed. Continuing to inject liquid ammonia could increase the risk of NH3 leakage. The second ammonia concentration value is the NH3 concentration at the outlet of the aftertreatment unit, directly reflecting whether the final exhaust gas emissions exceed standards. The fourth concentration value serves as the upper limit threshold for ammonia emissions in the exhaust gas (e.g., 25 ppm, complying with environmental regulations). When the second ammonia concentration value exceeds the fourth concentration value, it indicates that the ammonia concentration in the exhaust gas emissions has exceeded standards, and liquid ammonia injection must be stopped immediately.

[0054] By implementing the above embodiments, a second ammonia sensor is introduced to monitor the ammonia concentration at the outlet. When the concentration exceeds the fourth concentration value, ammonia blending combustion is stopped in time to avoid excessive ammonia leakage in the exhaust gas. By combining the data from the inlet and outlet sensors for ammonia blending control, the accuracy of exhaust gas treatment and the robustness of the control strategy are improved.

[0055] In some embodiments, after step 103, the aforementioned engine ammonia-blended combustion control method may further include: acquiring a second ammonia concentration value through a second ammonia sensor, wherein the second ammonia sensor is disposed at the outlet end of the exhaust gas aftertreatment assembly.

[0056] Specifically, the second ammonia sensor is installed at the outlet of the exhaust aftertreatment assembly (such as SCR and ASC systems) to monitor the concentration of ammonia (NH3) in the treated exhaust emissions in real time. Compared to the first ammonia sensor (installed at the inlet), the second ammonia sensor focuses on reflecting the amount of residual ammonia in the final exhaust emissions, providing direct emissions compliance data.

[0057] Through the implementation of the above embodiments, the setting of the second ammonia sensor enables real-time monitoring of the ammonia concentration at the outlet of the exhaust gas aftertreatment component, providing comprehensive data support for closed-loop control; by adding a monitoring point at the outlet, the control logic of ammonia-blended combustion is further improved, and the overall performance of combustion efficiency and exhaust gas emission control is enhanced.

[0058] In some embodiments, after step 103, the aforementioned engine ammonia-blended combustion control method may further include: calculating a second ammonia concentration value based on the nitrogen oxide reduction efficiency of the exhaust aftertreatment component, a first ammonia concentration value, a first nitrogen-based gas concentration value, and a second nitrogen-based gas concentration value, wherein the second nitrogen-based gas concentration value is obtained by a second nitrogen oxide sensor, and the second nitrogen oxide sensor is disposed at the outlet end of the exhaust aftertreatment component.

[0059] Specifically, the second nitrogen oxide sensor is a sensor installed at the outlet of the exhaust aftertreatment assembly (such as SCR and ASC systems) to monitor nitrogen oxides (NOx) in the exhaust emissions in real time after treatment. x The concentration of nitrogen oxides (NOx) at the exhaust gas aftertreatment unit is called the second nitrogen-based gas concentration value. The second ammonia concentration value is the residual ammonia (NH3) concentration at the outlet of the exhaust gas aftertreatment unit. It can be measured not only by sensors but also calculated using the concentrations of other gases in the exhaust gas and system efficiency parameters. The first ammonia concentration value represents the amount of ammonia injected at the inlet, while the first and second nitrogen-based gas concentration values ​​represent the NOx concentrations entering and leaving the SCR system, respectively. Combining this with the NOx reduction efficiency of the exhaust gas aftertreatment unit, the actual amount of ammonia participating in the reduction reaction can be determined. This amount is then subtracted from the inlet ammonia concentration to calculate the remaining ammonia concentration at the outlet.

[0060] By implementing the above embodiments, the nitrogen oxide reduction efficiency and related concentration data of the exhaust gas aftertreatment component are combined to dynamically calculate the second ammonia concentration value, providing a more accurate basis for optimizing the ammonia blending ratio; based on the multi-parameter calculation method, the fine dynamic adjustment of the ammonia blending ratio is realized, further improving the adaptability and intelligence level of the system, and saving the resource cost of setting up another ammonia sensor.

[0061] Furthermore, as an implementation of the aforementioned method embodiments, this application also provides an engine ammonia-blended combustion control device for implementing the aforementioned method embodiments. This device embodiment corresponds to the aforementioned method embodiments. For ease of reading, this engine ammonia-blended combustion control device embodiment will not repeat the details of the aforementioned method embodiments one by one, but it should be understood that the device in this application embodiment can correspondingly implement all the contents of the aforementioned method embodiments. For example... Figure 2 As shown, the engine ammonia-blended combustion control device 20 includes: an ammonia-blended combustion unit 201, a concentration acquisition unit 202, a concentration calculation unit 203, an ammonia-blended judgment unit 204, and an ammonia-blended judgment unit 205. The ammonia-blended combustion unit 201 is used to continuously inject liquid ammonia according to a first ammonia blending ratio during engine operation when the first ammonia sensor and the first nitrogen oxide sensor are in the activated state. Both the first ammonia sensor and the first nitrogen oxide sensor are located at the inlet end of the exhaust aftertreatment component. The concentration acquisition unit 202 is used to acquire the first ammonia concentration value and the first nitrogen-based gas concentration value through the first ammonia sensor and the first nitrogen oxide sensor. The concentration calculation unit 203 is used to calculate the difference between the first nitrogen-based gas concentration value and the first ammonia concentration value to obtain the nitrogen oxide concentration value. The ammonia-blended judgment unit 204 is used to continue injecting liquid ammonia during engine operation when the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value. The ammonia-blended judgment unit is also used to stop injecting liquid ammonia during engine operation when the first ammonia concentration value is greater than the nitrogen oxide concentration value.

[0062] In some embodiments, the ammonia blending determination unit 204 is further configured to: when the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value, and the first ammonia concentration value is less than or equal to the first concentration value, continue to inject liquid ammonia according to the first ammonia blending ratio during engine operation; when the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value, the first ammonia concentration value is greater than the first concentration value, and the first ammonia concentration value is less than or equal to the second concentration value, continue to inject liquid ammonia according to the second ammonia blending ratio during engine operation, wherein the second concentration value is greater than the first concentration value, and the second ammonia blending ratio is less than the first ammonia blending ratio. The proportions are as follows: When the first ammonia concentration is less than or equal to the nitrogen oxide concentration, the first ammonia concentration is greater than the second concentration, and the first ammonia concentration is less than or equal to the third concentration, liquid ammonia continues to be injected during engine operation according to the third ammonia blending ratio, wherein the third concentration is greater than the second concentration and the third ammonia blending ratio is less than the second ammonia blending ratio; when the first ammonia concentration is less than or equal to the nitrogen oxide concentration, and the first ammonia concentration is greater than the third concentration, liquid ammonia continues to be injected during engine operation according to the fourth ammonia blending ratio, wherein the fourth ammonia blending ratio is less than the third ammonia blending ratio.

[0063] In some embodiments, the first concentration value, the second concentration value, and the third concentration value correspond to different measurement accuracy thresholds of the first nitrogen oxide sensor.

[0064] In some embodiments, the first concentration value, the second concentration value, and the third concentration value are set in a proportionally increasing manner.

[0065] In some embodiments, the ammonia doping determination unit 204 is further configured to stop injecting liquid ammonia during engine operation when the first ammonia concentration value is greater than the nitrogen oxide concentration value and the second ammonia concentration value is greater than the fourth concentration value, wherein the second ammonia concentration value is the ammonia concentration value output by the exhaust gas aftertreatment component.

[0066] In some embodiments, the ammonia doping determination unit 204 is further configured to obtain a second ammonia concentration value through a second ammonia sensor, wherein the second ammonia sensor is disposed at the outlet end of the exhaust gas aftertreatment component.

[0067] In some embodiments, the ammonia doping determination unit 204 is further configured to calculate a second ammonia concentration value based on the nitrogen oxide reduction efficiency of the exhaust gas aftertreatment component, a first ammonia concentration value, a first nitrogen-based gas concentration value, and a second nitrogen-based gas concentration value, wherein the second nitrogen-based gas concentration value is obtained by a second ammonia oxide sensor, which is disposed at the outlet end of the exhaust gas aftertreatment component.

[0068] This application also provides a computer-readable storage medium storing computer-executable instructions or computer programs that, when executed by a processor, will cause the processor to perform any step of the engine ammonia-blended combustion control method provided in this application.

[0069] In some embodiments, the computer-readable storage medium may be a memory such as RAM, read-only memory (ROM), flash memory, magnetic surface memory, optical disc, or compact disc read-only memory (CD-ROM); or it may be a variety of devices including one or any combination of the above-mentioned memories.

[0070] In some embodiments, computer-executable instructions may take the form of programs, software, software modules, scripts, or code, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and may be deployed in any form, including as stand-alone programs or as modules, components, subroutines, or other units suitable for use in a computing environment.

[0071] In some embodiments, computer-executable instructions may, but do not necessarily, correspond to files in a file system, and may be stored as part of a file that holds other programs or data, for example, in one or more scripts in a HyperText Markup Language (HTML) document, in a single file dedicated to the program in question, or in multiple co-located files (e.g., files that store one or more modules, subroutines, or code sections).

[0072] In some embodiments, computer-executable instructions may be deployed to execute on an electronic device, or on multiple electronic devices located at one location, or on multiple electronic devices distributed across multiple locations and interconnected via a communication network.

[0073] like Figure 3 As shown, this application also provides an electronic device 30, including a memory 310, a processor 320, and a computer program 311 stored in the memory 310 and executable on the processor. When the processor 320 executes the computer program 311, it implements any step of the above-described engine ammonia combustion control method.

[0074] This application also provides a computer program product comprising a computer program or computer-executable instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer program or computer-executable instructions from the computer-readable storage medium and executes the computer program or computer-executable instructions, causing the electronic device to perform any step of the engine ammonia-blended combustion control method described above.

[0075] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for controlling ammonia-blended combustion in an engine, characterized in that, include: When the first ammonia sensor and the first nitrogen oxide sensor are in the start-up state, liquid ammonia is continuously injected according to the first ammonia blending ratio during engine operation. The first ammonia sensor and the first nitrogen oxide sensor are both located at the inlet end of the exhaust gas aftertreatment component. The first ammonia concentration value and the first nitrogen-based gas concentration value are obtained through the first ammonia sensor and the first nitrogen oxide sensor; The difference between the concentration values ​​of the first nitrogen-based gas and the first ammonia gas is calculated to obtain the concentration value of nitrogen oxides; When the first ammonia concentration is less than or equal to the nitrogen oxide concentration, the liquid ammonia continues to be injected during engine operation. When the first ammonia concentration value is greater than the nitrogen oxide concentration value, the injection of liquid ammonia is stopped during engine operation; The step of continuing to inject liquid ammonia during engine operation when the first ammonia concentration is less than or equal to the nitrogen oxide concentration includes: When the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value, and the first ammonia concentration value is less than or equal to the first concentration value, the liquid ammonia continues to be injected according to the first ammonia blending ratio during engine operation. When the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value, the first ammonia concentration value is greater than the first concentration value, and the first ammonia concentration value is less than or equal to the second concentration value, the liquid ammonia continues to be injected according to the second ammonia blending ratio during engine operation, wherein the second concentration value is greater than the first concentration value, and the second ammonia blending ratio is less than the first ammonia blending ratio; When the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value, the first ammonia concentration value is greater than the second concentration value, and the first ammonia concentration value is less than or equal to the third concentration value, the liquid ammonia continues to be injected during engine operation according to the third ammonia blending ratio, wherein the third concentration value is greater than the second concentration value, and the third ammonia blending ratio is less than the second ammonia blending ratio; When the first ammonia concentration is less than or equal to the nitrogen oxide concentration and the first ammonia concentration is greater than the third concentration, the liquid ammonia continues to be injected during engine operation according to the fourth ammonia blending ratio, wherein the fourth ammonia blending ratio is less than the third ammonia blending ratio.

2. The engine ammonia-blended combustion control method according to claim 1, characterized in that, The first concentration value, the second concentration value, and the third concentration value correspond to different measurement accuracy thresholds of the first nitrogen oxide sensor.

3. The engine ammonia-blended combustion control method according to claim 1, characterized in that, The first concentration value, the second concentration value, and the third concentration value are set in a proportionally increasing manner.

4. The engine ammonia-blended combustion control method according to any one of claims 1 to 3, characterized in that, The step of stopping the injection of liquid ammonia during engine operation when the first ammonia concentration value is greater than the nitrogen oxide concentration value includes: When the first ammonia concentration value is greater than the nitrogen oxide concentration value and the second ammonia concentration value is greater than the fourth concentration value, the injection of liquid ammonia during engine operation is stopped, wherein the second ammonia concentration value is the ammonia concentration value output by the exhaust gas aftertreatment component.

5. The engine ammonia-blended combustion control method according to claim 4, characterized in that, After calculating the difference between the first nitrogen-based gas concentration value and the first ammonia gas concentration value to obtain the nitrogen oxide concentration value, the engine ammonia-blended combustion control method further includes: The second ammonia concentration value is obtained by a second ammonia sensor, wherein the second ammonia sensor is located at the outlet end of the exhaust gas aftertreatment component.

6. The engine ammonia-blended combustion control method according to claim 4, characterized in that, After calculating the difference between the first nitrogen-based gas concentration value and the first ammonia gas concentration value to obtain the nitrogen oxide concentration value, the engine ammonia-blended combustion control method further includes: Based on the nitrogen oxide reduction efficiency of the exhaust gas aftertreatment component, the first ammonia concentration value, the first nitrogen-based gas concentration value, and the second nitrogen-based gas concentration value, the second ammonia concentration value is calculated. The second nitrogen-based gas concentration value is obtained by a second nitrogen oxide sensor, which is located at the outlet end of the exhaust gas aftertreatment component.

7. An engine ammonia-blended combustion control device, characterized in that, include: The ammonia-blended combustion unit is used to continuously inject liquid ammonia according to a first ammonia blending ratio during engine operation when the first ammonia sensor and the first nitrogen oxide sensor are in the start-up state. The first ammonia sensor and the first nitrogen oxide sensor are both located at the inlet end of the exhaust gas aftertreatment component. The concentration acquisition unit is used to acquire the first ammonia concentration value and the first nitrogen-based gas concentration value through the first ammonia sensor and the first nitrogen oxide sensor; The concentration calculation unit is used to calculate the difference between the concentration value of the first nitrogen-based gas and the concentration value of the first ammonia gas to obtain the concentration value of nitrogen oxides. An ammonia-addition determination unit is used to continue injecting liquid ammonia during engine operation when the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value. The ammonia-addition determination unit is also used to stop injecting liquid ammonia during engine operation when the first ammonia concentration value is greater than the nitrogen oxide concentration value; The ammonia blending determination unit is further configured to: When the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value, and the first ammonia concentration value is less than or equal to a first concentration value, continue injecting liquid ammonia according to the first ammonia blending ratio during engine operation; when the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value, the first ammonia concentration value is greater than the first concentration value, and the first ammonia concentration value is less than or equal to a second concentration value, continue injecting liquid ammonia according to a second ammonia blending ratio during engine operation, wherein the second concentration value is greater than the first concentration value, and the second ammonia blending ratio is less than the first ammonia blending ratio; when the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value, the first ammonia concentration value is greater than the first concentration value, and the first ... and the first ammonia concentration value is less than the first concentration value, continue injecting liquid ammonia according to a second ammonia blending ratio during engine operation. When the ammonia concentration is less than or equal to the nitrogen oxide concentration, the first ammonia concentration is greater than the second concentration, and the first ammonia concentration is less than or equal to the third concentration, liquid ammonia continues to be injected during engine operation according to a third ammonia blending ratio, wherein the third concentration is greater than the second concentration and the third ammonia blending ratio is less than the second ammonia blending ratio; when the first ammonia concentration is less than or equal to the nitrogen oxide concentration, and the first ammonia concentration is greater than the third concentration, liquid ammonia continues to be injected during engine operation according to a fourth ammonia blending ratio, wherein the fourth ammonia blending ratio is less than the third ammonia blending ratio.

8. An electronic device, comprising: The memory and processor are characterized in that the processor, when executing a computer program stored in the memory, implements the steps of the engine ammonia-blended combustion control method as described in any one of claims 1-6.

9. A 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 steps of the engine ammonia-blended combustion control method as described in any one of claims 1-6.

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