Engine ammonia-doped combustion control method and related equipment

Abstract

The invention discloses an engine ammonia doping combustion control method and related equipment, and relates to the technical field of diesel ammonia engines, the method comprises the following steps: when a first ammonia gas sensor and a first nitrogen oxide sensor are in a starting state, liquid ammonia is continuously injected according to a first ammonia doping proportion in the working process of an engine; acquiring a first ammonia gas concentration value and a first nitrogen-based gas concentration value through a first ammonia gas sensor and a first nitrogen oxide sensor; calculating a difference value between the first nitrogen-based gas concentration value and the first ammonia gas concentration value to obtain a nitrogen oxide concentration value; and when the first ammonia gas concentration value is smaller than or equal to the nitrogen oxide concentration value, liquid ammonia continues to be injected in the working process of the engine, and otherwise, liquid ammonia injection in the working process of the engine is stopped. By monitoring the concentration of the ammonia gas and the nitrogen oxide in real time and dynamically adjusting the injection amount of the ammonia gas, leakage and excessive emission caused by excessive ammonia doping are avoided, so that the energy utilization efficiency is optimized, and the consumption cost of liquid ammonia is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of diesel-ammonia engines, and more specifically, to an engine ammonia combustion control method and related equipment. Background Art

[0002] With the continuous development of engine combustion technology, ammonia, as a zero-carbon alternative fuel with great potential, has gradually attracted widespread attention due to its advantages in emission reduction and sustainability. Ammonia has the problem of slow combustion and low temperature in the engine, so it needs to be ignited by fuel. The more common way is to mix it with diesel. The ammonia fuel blending technology has improved combustion efficiency and reduced NO x However, due to the particularity of ammonia combustion, its application in engines faces many technical challenges, especially in the control of blending ratio and exhaust emission treatment. How to balance the contradiction between efficient combustion and low emissions has become the focus of technical research.

[0003] In the prior art, the control methods for engine ammonia combustion mostly adopt a fixed ammonia ratio or a simple control method based on a single parameter. Although these methods realize the basic ammonia combustion function, they are often unable to fully cope with complex operating conditions in actual applications. In particular, the unburned ammonia (NH3) generated by ammonia combustion may enter the exhaust gas after-treatment system with the exhaust gas, resulting in excessive emissions. In addition, the prior art is mostly based on traditional NO x The sensor monitors and controls exhaust emissions, but NO x The sensor cannot distinguish between ammonia (NH3) and nitrogen oxides (NO x ), this technical bottleneck makes it difficult to accurately adjust the ammonia ratio control, and the effectiveness of the emission control strategy is limited. That is, the existing technology has the technical problems of poor adaptability to complex working conditions of the control method for engine ammonia combustion, insufficient precision in adjusting the ammonia ratio, and low efficiency in exhaust emission control. Summary of the invention

[0004] A series of simplified concepts are introduced in the summary of the invention, which will be further described in detail in the detailed description. The summary of the invention of this application does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

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

[0006] In a first aspect, the present application provides an engine ammonia combustion control method, comprising: when a first ammonia sensor and a first nitrogen oxide sensor are in a startup 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 arranged at the inlet end of an exhaust gas after-treatment 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 a difference between the first nitrogen-based gas concentration value and the first ammonia concentration value to obtain a nitrogen oxide concentration value; when the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value, continuing to inject the liquid ammonia during engine operation; when the first ammonia concentration value is greater than the nitrogen oxide concentration value, stopping injecting the liquid ammonia during engine operation.

[0007] In a feasible implementation manner, when the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value, continuing to inject the liquid ammonia during the operation of the engine 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, continuing to inject the liquid ammonia during the operation of the engine according to 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 ammonia concentration value is less than or equal to the second concentration value, continuing to inject the liquid ammonia during the operation of the engine according to the second ammonia blending ratio, wherein the second concentration value is greater than the first concentration value. 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, continue to inject the liquid ammonia according to the third ammonia blending ratio during the operation of the engine, 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, continue to inject the liquid ammonia according to the fourth ammonia blending ratio during the operation of the engine, wherein the fourth ammonia blending ratio is less than the third ammonia blending ratio.

[0008] In a feasible implementation manner, 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 a feasible implementation manner, the first concentration value, the second concentration value and the third concentration value are set in a geometrically increasing form.

[0010] In a feasible embodiment, when the first ammonia concentration value is greater than the nitrogen oxide concentration value, the injection of the liquid ammonia during the engine operation is stopped, including: 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 the liquid ammonia during the engine operation is stopped, wherein the second ammonia concentration value is the ammonia concentration value output by the exhaust after-treatment component.

[0011] In a feasible embodiment, 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 combustion control method also includes: obtaining the second ammonia concentration value through a second ammonia sensor, wherein the second ammonia sensor is arranged at the outlet end of the exhaust gas after-treatment component.

[0012] In a feasible embodiment, 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 combustion control method also includes: calculating the second ammonia concentration value based on the nitrogen oxide reduction efficiency of the exhaust gas after-treatment 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 arranged at the outlet end of the exhaust gas after-treatment component.

[0013] In the second aspect, the present application also provides an engine ammonia-blended combustion control device, comprising: an ammonia-blended combustion unit, used to continuously inject liquid ammonia according to a first ammonia-blending ratio during the operation of the engine when the first ammonia sensor and the first nitrogen oxide sensor are in a startup state, wherein the first ammonia sensor and the first nitrogen oxide sensor are both arranged at the inlet end of the exhaust gas after-treatment component; a concentration acquisition unit, used to obtain 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, used 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, used to continue injecting the liquid ammonia during the operation of the engine when the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value; the ammonia-blending judgment unit is also used to stop injecting the liquid ammonia during the operation of the engine when the first ammonia concentration value is greater than the nitrogen oxide concentration value.

[0014] In a third aspect, the present application further provides an electronic device, comprising: a memory and a processor, wherein the processor is configured to implement the steps of the engine ammonia combustion control method described in the first aspect when executing a computer program stored in the memory.

[0015] In a fourth aspect, the present application further provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the engine ammonia combustion control method described in the first aspect.

[0016] In a fifth aspect, the present application also provides a computer program product, including a computer program or computer executable instructions, which, when executed by a processor, implements the engine ammonia combustion control method provided in an embodiment of the present application.

[0017] In summary, the present application can accurately determine the generation of the first ammonia and the first nitrogen-based gas during the combustion process through the cooperation of the first ammonia sensor and the first nitrogen oxide sensor, and control based on the real-time changes in the concentrations of the two, which can effectively avoid ammonia leakage caused by excessive ammonia mixing; when the first ammonia concentration value is greater than the nitrogen oxide concentration, it indicates that the ammonia may be excessive, and the injection of liquid ammonia is stopped, thereby avoiding unnecessary ammonia leakage and excessive emissions, which not only avoids the waste of excessive ammonia mixing, but also reduces the consumption cost of liquid ammonia, reduces unnecessary ammonia consumption, and helps to optimize overall energy efficiency. In summary, the engine ammonia combustion control method provided by the present application monitors the concentrations of ammonia and nitrogen oxides in real time, dynamically adjusts the ammonia injection amount, avoids leakage and excessive emissions caused by excessive ammonia mixing, thereby optimizing energy efficiency and reducing liquid ammonia consumption costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present specification. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0019] Figure 1 A schematic flow chart of an engine ammonia combustion control method provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of the composition structure of an engine ammonia combustion control device provided in an embodiment of the present application;

[0021] Figure 3 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "is" and "has" and any variations thereof involved in the present application are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] The term "module" or "unit" in this application refers to a computer program or a part of a computer program that has a predetermined function and works together with other related parts to achieve a predetermined goal, and can be implemented in whole or in part by using software, hardware (such as processing circuits or memories) or a combination thereof. Similarly, a processor (or multiple processors or memories) can be used to implement one or more modules or units. In addition, each module or unit can be part of an overall module or unit that includes the function of the module or unit.

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. In the following description, it is related to "some embodiments", which describes a subset of all possible embodiments, but it can be 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 also Figure 1 , Figure 1 1 is a flow chart of a method for controlling engine ammonia combustion provided by an embodiment of the present 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 a startup state, liquid ammonia is continuously injected according to a first ammonia blending ratio during the operation of the engine, wherein the first ammonia sensor and the first nitrogen oxide sensor are both arranged at the inlet end of the exhaust gas post-treatment component;

[0027] Specifically, the first ammonia sensor refers to a sensor for measuring the concentration of ammonia (NH3), which is installed at the inlet end of the exhaust after-treatment 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 situation; the first nitrogen oxide sensor refers to a sensor for measuring the concentration of nitrogen oxide (NOx), which is also installed at the inlet end of the exhaust after-treatment 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 blending combustion according to the preset ammonia to fuel mixing ratio when the engine is in the initial working state. This ratio is set when the engine starts working. The exhaust after-treatment component refers to an important part of the engine exhaust system, which may include a selective catalytic reduction (SCR) system and an ammonia slip catalyst (ASC); conversely, the exhaust pre-treatment component may include a selective catalytic reduction (SCR) system, an ammonia slip catalyst (ASC), an oxidation catalyst (DOC) and a particulate filter (DPF).

[0028] Illustratively, during the operation of the engine, 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, liquid ammonia will be immediately and continuously injected into the engine according to the preset first ammonia blending ratio, and dew point release will be performed before the first ammonia sensor and the first nitrogen oxide sensor are started; dew point release refers to the process of evaporating the water that may condense inside the sensor through heating or other methods, so as 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 in the exhaust gas (the first ammonia concentration value and the first nitrogen-based gas concentration value) are monitored before the ammonia-blended combustion process begins, effectively avoiding the problem of uncontrolled ammonia blending ratio caused by the sensor not being started or the data being incomplete, thereby ensuring the stability of the combustion process and the accuracy of exhaust emission control.

[0030] Step 102, obtaining a first ammonia concentration value and a first nitrogen-based gas concentration value through a first ammonia sensor and a first nitrogen oxide sensor;

[0031] Specifically, the first ammonia concentration value is the concentration value 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 combustion and exhaust emissions, and is an important parameter for evaluating the ammonia combustion effect and exhaust gas treatment efficiency. Since ammonia has a high auto-ignition temperature and a slow combustion rate, its unburned part may enter the exhaust gas after-treatment component with the exhaust gas. Therefore, by real-time monitoring of ammonia concentration, NH3 leakage problems can be effectively identified and controlled to prevent it from exceeding the standard and being discharged into the environment. The first nitrogen-based gas concentration value is the nitrogen-based gas (mainly nitrogen oxides, NO x ) concentration value; NO x Including NO (nitrogen oxides) and NO2 (nitrogen dioxide), it is one of the main pollutants generated during engine combustion.

[0032] Through the implementation of step 102, key parameter support is provided for the control of the ammonia blending ratio during the combustion process. The dynamic monitoring data information covers the concentration changes of ammonia and nitrogen oxides, so that the system can fully grasp the combustion and emission conditions, thereby laying the foundation for subsequent precise control.

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

[0034] Specifically, the nitrogen oxide concentration value is the nitrogen oxide (NO x , including the actual concentration of nitrogen monoxide NO and nitrogen dioxide NO2). This value eliminates the interference of ammonia (NH3) in the nitrogen oxide sensor reading and can accurately reflect 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, the actual concentration of nitrogen oxides is clarified, and the deficiency that the sensor cannot directly distinguish between ammonia and nitrogen oxides is compensated, the reliability and accuracy of the data are improved, and an accurate basis is provided for real-time adjustment of the ammonia blending ratio, while enhancing the accuracy 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 the operation of the engine;

[0037] Specifically, when the first ammonia concentration value is lower than or equal to the nitrogen oxide concentration value, it indicates that the exhaust gas contains NO x The content is still high, and NH3 is not enough to complete the degradation of NO x The exhaust gas aftertreatment components need more NH3 to participate in the reaction to reduce NO x emissions, so continue to inject liquid ammonia into the engine. This will ensure that NOx Maintain a reasonable balance with NH3 to increase NO in exhaust gas x Restore efficiency and avoid excessive emissions.

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

[0039] Specifically, when the first ammonia concentration value is higher than the nitrogen oxide concentration value, it means that the NH3 in the exhaust gas after-treatment component has exceeded the NO x If the required reduction amount is exceeded and excessive NH3 is injected, if liquid ammonia continues to be injected, NH3 may leak to the downstream of the exhaust gas after-treatment system or even be discharged into the atmosphere, causing excessive ammonia emissions in the exhaust gas.

[0040] By implementing step 105, excessive ammonia emissions are avoided, the normal operation of the exhaust gas after-treatment components is protected, the service life thereof is extended, and the economic efficiency of system resource utilization is improved.

[0041] In summary, the present application can accurately determine the generation of the first ammonia and the first nitrogen-based gas during the combustion process through the cooperation of the first ammonia sensor and the first nitrogen oxide sensor, and control based on the real-time changes in the concentrations of the two, which can effectively avoid ammonia leakage caused by excessive ammonia mixing; when the first ammonia concentration value is greater than the nitrogen oxide concentration, it indicates that the ammonia may be excessive, and the injection of liquid ammonia is stopped, thereby avoiding unnecessary ammonia leakage and excessive emissions, which not only avoids the waste of excessive ammonia mixing, but also reduces the consumption cost of liquid ammonia, reduces unnecessary ammonia consumption, and helps to optimize overall energy efficiency. In summary, the engine ammonia combustion control method provided by the present application monitors the concentrations of ammonia and nitrogen oxides in real time, dynamically adjusts the ammonia injection amount, avoids leakage and excessive emissions caused by excessive ammonia mixing, thereby optimizing energy efficiency and reducing liquid ammonia consumption costs.

[0042] In some embodiments, the aforementioned 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, continue to inject liquid ammonia according to the first ammonia blending ratio during the operation of the engine; 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 the operation of the engine, 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. 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, continue to inject liquid ammonia according to the third ammonia blending ratio during the operation of the engine, 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, continue to inject liquid ammonia according to the fourth ammonia blending ratio during the operation of the engine, wherein the fourth ammonia blending ratio is less than the third ammonia blending ratio.

[0043] Specifically, the first concentration value, the second concentration value and the third concentration value are graded thresholds set according to the variation range of the ammonia concentration in the tail gas (the first ammonia concentration value), which are used to judge the current NH3 concentration level and determine the proportion adjustment of liquid ammonia injection; 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 the NO x The second concentration value is the middle threshold, slightly higher than the first concentration value, indicating that the ammonia concentration has increased. At this time, the ammonia 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, close to the upper limit of the acceptable ammonia concentration, and the ammonia ratio needs to be reduced again to maintain the concentration balance. The second ammonia ratio, the third ammonia ratio and the fourth ammonia ratio are the liquid ammonia injection ratios corresponding to different concentration value ranges.

[0044] For example, for an ammonia diesel engine of a long-distance freight truck, when running at low load and low speed (such as driving on a city road), the exhaust temperature is low, the combustion and reaction rate of ammonia is slow, and the first ammonia concentration value is lower than or equal to the first concentration value, indicating that NH3 is still insufficient to fully reduce NO x Therefore, liquid ammonia is injected according to the first ammonia mixing ratio to maintain the necessary reduction reaction and ensure NO xThe emission is 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 unburned NH3 concentration may gradually approach the second concentration value. The liquid ammonia injection amount is adjusted to the second ammonia blending ratio, and the ammonia injection amount is reduced 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 injection amount of ammonia and prevent NH3 leakage while maintaining the efficient operation of the SCR system; under extremely high load or sudden acceleration conditions (such as climbing a slope or emergency acceleration), the NH3 concentration in the exhaust gas may exceed the third concentration value. The liquid ammonia injection amount is greatly reduced according to the fourth ammonia blending ratio to avoid serious NH3 leakage while ensuring stable operation of the exhaust treatment system.

[0045] Through the implementation of the above embodiment, according to different intervals of ammonia concentration values, a graded ammonia blending ratio control method (the first ammonia blending ratio to the fourth ammonia blending ratio) is adopted, which can more finely adjust the ammonia blending amount in the combustion process, so that the combustion control can adapt to a variety of operating conditions and improve the combustion efficiency and exhaust gas treatment effect.

[0046] In some embodiments, 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.

[0047] Exemplarily, the first concentration value is 25ppm, corresponding to the range of higher accuracy of the first nitrogen oxide sensor (error ±10%); when the first ammonia concentration value is ≤ the first concentration value, liquid ammonia is injected according to the first ammonia mixing ratio (e.g., 50%). The second concentration value is 50ppm, corresponding to the range of medium sensor accuracy (error ±20%); when the first ammonia concentration value is between the first concentration value and the second concentration value, liquid ammonia is injected according to the second ammonia mixing ratio (e.g., 40%). The third concentration value is 100ppm, corresponding to the range of lower sensor accuracy (error ±50%); when the first ammonia concentration value is between the second concentration value and the third concentration value, liquid ammonia is injected according to the third ammonia mixing ratio (e.g., 30%).

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

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

[0050] Exemplarily, the first concentration value is 20ppm, which is used as the basic concentration threshold for ammonia doping control; when the first ammonia concentration value is ≤ the first concentration value, liquid ammonia is injected according to the first ammonia doping ratio (e.g., 60%). The second concentration value is 40ppm, which is twice the first concentration value; when the first ammonia concentration value is between the first concentration value and the second concentration value, liquid ammonia is injected according to the second ammonia doping ratio (e.g., 45%). The third concentration value is 80ppm, which is twice the second concentration value; when the first ammonia concentration value is between the second concentration value and the third concentration value, liquid ammonia is injected according to the third ammonia doping ratio (e.g., 25%).

[0051] Through the implementation of the above embodiment, by setting the first concentration value, the second concentration value and the third concentration value in geometric increments, the concentration value setting method is simplified, the segmented adjustment strategy is optimized, the smoothness of the ammonia blending ratio adjustment is ensured, the ammonia blending ratio is gradually adjusted, and the combustion efficiency fluctuations caused by sudden changes are avoided.

[0052] In some embodiments, the aforementioned step 105 may include: 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, stopping the injection of liquid ammonia during the engine operation process, wherein the second ammonia concentration value is the ammonia concentration value output by the exhaust after-treatment component.

[0053] Specifically, when the first ammonia concentration value exceeds the nitrogen oxide concentration value, it indicates that the ammonia in the exhaust gas is excessive, compared with NO x The actual concentration of liquid ammonia is no longer required. If liquid ammonia is continued to be injected, the risk of NH3 leakage may increase. The second ammonia concentration value is the NH3 concentration value at the outlet of the post-treatment component, which is used to directly reflect whether the final exhaust gas emissions exceed the standard; the fourth concentration value is used as the upper limit concentration threshold of ammonia emissions in the exhaust gas (for example, 25ppm, in compliance with environmental protection regulations). When the second ammonia concentration value exceeds the fourth concentration value, it indicates that the ammonia concentration of the exhaust gas emissions has exceeded the standard and the injection of liquid ammonia needs to be stopped immediately.

[0054] Through the implementation of the above embodiment, a second ammonia sensor is introduced to monitor the outlet ammonia concentration value. When the concentration value exceeds the fourth concentration value, the ammonia combustion is stopped in time to avoid excessive leakage of ammonia in the exhaust gas; the data of the inlet sensor and the outlet sensor are combined to control the ammonia blending, thereby improving the accuracy of exhaust gas treatment and the robustness of the control strategy.

[0055] In some embodiments, after step 103, the aforementioned engine ammonia combustion control method may further include: obtaining 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 after-treatment component.

[0056] Specifically, the second ammonia sensor is a sensor installed at the outlet of the exhaust post-treatment component (such as SCR and ASC system) to monitor the ammonia (NH3) concentration in the exhaust after treatment in real time. Compared with the first ammonia sensor (installed at the inlet end), the second ammonia sensor focuses on reflecting the residual ammonia in the final exhaust emissions and provides direct emission compliance data.

[0057] Through the implementation of the above embodiment, the provision of the second ammonia sensor enables real-time monitoring of the ammonia concentration at the outlet of the exhaust after-treatment component, providing comprehensive data support for closed-loop control; by adding monitoring points at the outlet, the control logic of ammonia-blended combustion is further improved, thereby improving the combustion efficiency and the overall performance of exhaust emission control.

[0058] In some embodiments, after step 103, the aforementioned engine ammonia combustion control method may further include: calculating a second ammonia concentration value based on the nitrogen oxide reduction efficiency of the exhaust gas after-treatment 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 arranged at the outlet end of the exhaust gas after-treatment component.

[0059] Specifically, the second nitrogen oxide sensor is a sensor installed at the outlet of the exhaust gas post-treatment component (such as SCR and ASC system) to monitor the nitrogen oxides (NO x ) concentration, 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 after-treatment component, which can not only be measured by the sensor, but also calculated by the concentration of other gases in the exhaust gas and the system efficiency parameters: the first ammonia concentration value represents the amount of ammonia injected at the inlet, the first nitrogen-based gas concentration value and the second nitrogen-based gas concentration value represent the nitrogen oxide concentrations of the exhaust gas entering and leaving the SCR system respectively; combined with the nitrogen oxide reduction efficiency of the exhaust after-treatment component, the amount of ammonia actually participating in the reduction reaction can be determined, and then deducted from the inlet ammonia concentration to calculate the remaining ammonia concentration at the outlet.

[0060] Through the implementation of the above-mentioned embodiment, the second ammonia concentration value is dynamically calculated in combination with the nitrogen oxide reduction efficiency of the exhaust gas after-treatment component and the relevant concentration data, providing a more accurate basis for optimizing the ammonia blending ratio; based on the multi-parameter calculation method, the refined dynamic adjustment of the ammonia blending ratio is realized, which further improves the adaptability and intelligence level of the system and saves the resource cost of setting up another ammonia sensor.

[0061] Furthermore, as an implementation of the aforementioned method embodiment, the present application also provides an engine ammonia combustion control device for implementing the aforementioned method embodiment. The device embodiment corresponds to the aforementioned method embodiment. For ease of reading, the present engine ammonia combustion control device embodiment will no longer repeat the details of the aforementioned method embodiment one by one, but it should be clear that the device in the embodiment of the present application can correspond to and implement all the contents of the aforementioned method embodiment. Figure 2 As shown, the engine ammonia combustion control device 20 includes: an ammonia combustion unit 201, a concentration acquisition unit 202, a concentration calculation unit 203, an ammonia determination unit 204 and an ammonia determination unit 205, wherein the ammonia combustion unit 201 is used to continuously inject liquid ammonia according to the first ammonia ratio during the operation of the engine when the first ammonia sensor and the first nitrogen oxide sensor are in the startup state, wherein the first ammonia sensor and the first nitrogen oxide sensor are both arranged at the inlet end of the exhaust gas after-treatment component; the concentration acquisition unit 202 is used to 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; 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 determination unit 204 is used to continue to inject liquid ammonia during the operation of the engine when the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value; the ammonia determination unit is also used to stop injecting liquid ammonia during the operation of the engine when the first ammonia concentration value is greater than the nitrogen oxide concentration value.

[0062] In some embodiments, the ammonia blending judgment unit 204 is further used to continue to inject liquid ammonia according to the first ammonia blending ratio during the operation of the engine 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; 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 the operation of the engine, 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. 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, continue to inject liquid ammonia according to the third ammonia blending ratio during the operation of the engine, 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, continue to inject liquid ammonia according to the fourth ammonia blending ratio during the operation of the engine, 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 respectively 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 geometrically increasing form.

[0065] In some embodiments, the ammonia blending judgment unit 204 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 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 after-treatment component.

[0066] In some embodiments, the ammonia doping judgment unit 204 is further used 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 after-treatment component.

[0067] In some embodiments, the ammonia doping judgment unit 204 is also used to calculate a second ammonia concentration value based on the nitrogen oxide reduction efficiency of the exhaust gas after-treatment 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 through a second ammonia oxide sensor, and the second ammonia oxide sensor is arranged at the outlet end of the exhaust gas after-treatment component.

[0068] The present application also provides a computer-readable storage medium, which stores computer-executable instructions or computer programs. When the computer-executable instructions or computer programs are executed by a processor, the processor will be caused to execute any step of the engine ammonia combustion control method provided in the present 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 disk, or compact disc read-only memory (CD-ROM); or it may be various devices including one or any combination of the above memories.

[0070] In some embodiments, computer executable instructions may be in the form of a program, software, software module, script 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 a stand-alone program or as a module, component, subroutine or other unit suitable for use in a computing environment.

[0071] In some embodiments, computer-executable instructions may, but need not, correspond to a file in a file system, may be stored as part of a file storing 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 coordinated files (e.g., files storing one or more modules, subroutines, or code portions).

[0072] In some embodiments, computer executable instructions may be deployed to be executed on one electronic device, or on multiple electronic devices located at one site, or on multiple electronic devices distributed at multiple sites and interconnected by a communication network.

[0073] like Figure 3 As shown, the present 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, and when the processor 320 executes the computer program 311, any step of the above-mentioned engine ammonia combustion control method is implemented.

[0074] The present application also provides a computer program product, which includes a computer program or a computer executable instruction, and the computer program or the computer executable instruction is stored in a computer readable storage medium. The processor of the electronic device reads the computer program or the computer executable instruction from the computer readable storage medium, and the processor executes the computer program or the computer executable instruction, so that the electronic device performs any step of the engine ammonia combustion control method described above in the present application.

[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 engine ammonia combustion, 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 the operation of the engine, wherein the first ammonia sensor and the first nitrogen oxide sensor are both arranged at the inlet end of the exhaust gas post-treatment component; 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 a difference between the first nitrogen-based gas concentration value and the first ammonia gas concentration value to obtain a nitrogen oxide concentration value; When the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value, continue to inject the liquid ammonia during the operation of the engine; When the first ammonia concentration value is greater than the nitrogen oxide concentration value, the injection of the liquid ammonia during the operation of the engine is stopped.

2. The engine ammonia combustion control method according to claim 1, characterized in that: When the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value, continuing to inject the liquid ammonia during the operation of the engine 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, continue to inject the liquid ammonia according to the first ammonia blending ratio during the operation of the engine; 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 to inject the liquid ammonia according to a second ammonia blending ratio during the operation of the engine, 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 ammonia concentration value, and the first ammonia concentration value is less than or equal to a third ammonia concentration value, continue to inject the liquid ammonia according to a third ammonia blending ratio during the operation of the engine, 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 according to a fourth ammonia blending ratio during engine operation, wherein the fourth ammonia blending ratio is less than the third ammonia blending ratio.

3. The engine ammonia combustion control method according to claim 2, characterized in that: 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.

4. The engine ammonia combustion control method according to claim 2, characterized in that: The first concentration value, the second concentration value and the third concentration value are set in a geometrically increasing manner.

5. The engine ammonia combustion control method according to any one of claims 1 to 4, characterized in that: When the first ammonia concentration value is greater than the nitrogen oxide concentration value, stopping the injection of the liquid ammonia during the operation of the engine comprises: 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 the liquid ammonia during the operation of the engine is stopped, wherein the second ammonia concentration value is the ammonia concentration value output by the exhaust post-treatment component.

6. The engine ammonia combustion control method according to claim 5, characterized in that: 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 combustion control method further includes: The second ammonia concentration value is obtained by a second ammonia sensor, wherein the second ammonia sensor is arranged at the outlet end of the exhaust gas post-treatment component.

7. The engine ammonia combustion control method according to claim 5, characterized in that: 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 combustion control method further includes: The second ammonia concentration value is calculated based on the nitrogen oxide reduction efficiency of the exhaust gas after-treatment 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 nitrogen oxide sensor, and the second nitrogen oxide sensor is arranged at the outlet end of the exhaust gas after-treatment component.

8. An engine ammonia combustion control device, characterized in that: include: an ammonia blending combustion unit, used for continuously injecting liquid ammonia according to a first ammonia blending ratio during the operation of the engine when the first ammonia sensor and the first nitrogen oxide sensor are in an activated state, wherein the first ammonia sensor and the first nitrogen oxide sensor are both arranged at the inlet end of the exhaust gas post-treatment 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 a difference between the first nitrogen-based gas concentration value and the first ammonia gas concentration value to obtain a nitrogen oxide concentration value; an ammonia blending judgment unit, configured to continue injecting the liquid ammonia during the operation of the engine when the first ammonia concentration value is less than or equal to the nitrogen oxide concentration value; The ammonia blending judgment unit is further used to stop injecting the liquid ammonia during the operation of the engine when the first ammonia concentration value is greater than the nitrogen oxide concentration value.

9. An electronic device, comprising: A memory and a processor, wherein the processor is used to implement the steps of the engine ammonia combustion control method as described in any one of claims 1 to 7 when executing the computer program stored in the memory.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the engine ammonia combustion control method according to any one of claims 1 to 7 are implemented.

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