Engine aftertreatment catalyst control method and device, electronic equipment and medium
By acquiring and constructing the mapping relationship between the oxygen storage capacity of the TWC deterioration level and the throttle opening and the voltage setting value of the rear oxygen sensor, the problem of the TWC control strategy not being adapted to the full life cycle deterioration was solved, and emission compliance and energy efficiency were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- FAW JIEFANG AUTOMOTIVE CO
- Filing Date
- 2026-01-20
- Publication Date
- 2026-04-21
Smart Images
Figure CN121897480A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of natural gas engine control technology, and in particular to a method, device, electronic equipment, and medium for controlling engine aftertreatment catalysts. Background Technology
[0002] The three-way catalytic converter (TWC) is a core component of the exhaust purification system for internal combustion engine vehicles. It converts pollutants such as CO, HC, and NOx in the exhaust gas into harmless substances through a catalytic reaction, which is a key guarantee for vehicles to meet emission regulations.
[0003] The purification performance of TWC is directly related to its oxygen storage capacity: brand new TWC has strong oxygen storage capacity and high purification efficiency; however, as the usage time increases, TWC will experience deterioration phenomena such as coating precious metal loss and carrier pore blockage, and the oxygen storage capacity will gradually decrease. If fixed engine control parameters are still used, it will lead to inaccurate air-fuel ratio control, and ultimately cause exhaust emissions to exceed the regulatory limits.
[0004] Currently, traditional TWC control strategies are not fully adapted to the entire life cycle degradation process of TWCs: on the one hand, there is a lack of precise methods to obtain the oxygen storage capacity of TWCs at different degradation levels, making it difficult to quantify the actual performance status of TWCs; on the other hand, it is impossible to adjust the control strategy in real time according to the degradation level of TWCs, resulting in a high risk of TWC emissions exceeding standards in the later stages. Summary of the Invention
[0005] The purpose of this invention is to provide an engine aftertreatment catalyst control method, device, electronic equipment and medium, so as to at least solve the problem of low aftertreatment conversion efficiency in existing solutions, thereby improving the exhaust emission level of automobiles and reducing energy consumption.
[0006] To address the aforementioned technical problems, in a first aspect, the present invention provides a method for controlling an engine aftertreatment catalyst, comprising at least:
[0007] Obtain the oxygen storage capacity corresponding to at least one degree of degradation of a three-way catalyst (TWC);
[0008] Construct a first mapping relationship between the oxygen storage capacity and the throttle opening value for each specific engine operating condition;
[0009] Construct a second mapping relationship between the oxygen storage capacity and the voltage setting value of the rear oxygen sensor under specific operating conditions of the engine;
[0010] During actual engine operation, the degree of TWC degradation is monitored in real time, and the current oxygen storage capacity of TWC is determined based on the degree of degradation.
[0011] The engine's emission status is adjusted based on the current oxygen storage, the first mapping relationship, and the second mapping relationship to ensure that the emission status meets emission standards.
[0012] Optionally, before obtaining the oxygen storage capacity corresponding to at least one degree of degradation of the three-way catalyst TWC, the method further includes:
[0013] The degree of degradation of at least one type of TWC is determined based on the purification conversion rate of TWC.
[0014] Optionally, the construction of the first mapping relationship between the oxygen storage capacity and the throttle opening value under specific engine operating conditions specifically includes:
[0015] Select the oxygen storage capacity of TWC under a specific operating condition of the engine and a certain degree of degradation;
[0016] The engine is kept running steadily under specific operating conditions, and the throttle opening value is gradually adjusted to obtain the optimal throttle opening value that meets the emission standards.
[0017] Record the oxygen storage capacity of TWC under all engine specific operating conditions and the degree of degradation, and the corresponding optimal throttle opening value to construct the first mapping relationship.
[0018] Optionally, the construction of the second mapping relationship between the oxygen storage capacity and the set value of the rear oxygen sensor under specific engine operating conditions specifically includes:
[0019] Select the oxygen storage capacity of TWC under a specific operating condition of the engine and a certain degree of degradation;
[0020] The engine is kept running steadily under specific operating conditions, and the oxygen sensor voltage setting value is gradually adjusted to obtain the optimal oxygen sensor voltage setting value that meets the emission standards.
[0021] Record the oxygen storage capacity of the TWC under all the specific operating conditions of the engine and the degree of degradation, as well as the corresponding optimal oxygen sensor voltage setting value, to construct the second mapping relationship.
[0022] Optionally, adjusting the engine's emission state based on the current oxygen storage, the first mapping relationship, and the second mapping relationship to ensure that the emission state meets emission standards specifically includes:
[0023] Based on the current oxygen storage, the optimal throttle opening value within the first mapping relationship is invoked;
[0024] Based on the current oxygen storage level, the optimal oxygen sensor voltage setting value within the second mapping relationship is invoked;
[0025] The engine's emission status is adjusted based on the optimal throttle opening value and the optimal oxygen sensor voltage setting value to ensure that the emission status meets emission standards.
[0026] Secondly, the present invention also provides an engine aftertreatment catalyst control device, comprising at least:
[0027] The acquisition module is used to acquire the oxygen storage capacity corresponding to at least one type of three-way catalyst (TWC) with varying degrees of degradation.
[0028] The first construction module is used to construct a first mapping relationship between the oxygen storage capacity and the throttle opening value under each specific engine operating condition.
[0029] The second construction module is used to construct a second mapping relationship between the oxygen storage capacity and the voltage setting value of the rear oxygen sensor under specific operating conditions of the engine.
[0030] The real-time calculation module is used to monitor the degree of degradation of TWC in real time during the actual operation of the engine and determine the current oxygen storage capacity of TWC based on the degree of degradation.
[0031] An emission control module is used to adjust the emission status of the engine based on the current oxygen storage, the first mapping relationship, and the second mapping relationship, so that the emission status meets the emission standards.
[0032] Optionally, it also includes:
[0033] The degradation classification module is used to determine the degree of degradation of at least one type of TWC based on the purification conversion rate of TWC.
[0034] Optionally, the first building module is specifically used for:
[0035] Select the oxygen storage capacity of TWC under a specific engine operating condition and a certain degree of degradation; maintain the engine in steady-state operation under the specific engine operating condition and gradually adjust the throttle opening value to obtain the optimal throttle opening value that meets the emission standards; and record the oxygen storage capacity of TWC under all specific engine operating conditions and the degree of degradation and the corresponding optimal throttle opening value to construct the first mapping relationship.
[0036] Thirdly, the present invention also provides an electronic device including a memory and a processor, the memory storing a computer program executable on the processor, the processor executing the program to implement the steps of the engine aftertreatment catalyst control method according to any one of the first aspects.
[0037] Fourthly, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the engine aftertreatment catalyst control method according to any one of the first aspects.
[0038] The technical solution provided by this invention firstly obtains the oxygen storage capacity corresponding to at least one degree of deterioration of the three-way catalytic converter (TWC); secondly, establishes a first mapping relationship between each oxygen storage capacity and the throttle opening value under specific engine operating conditions; thirdly, establishes a second mapping relationship between each oxygen storage capacity and the voltage setting value of the rear oxygen sensor under specific engine operating conditions; then, during actual engine operation, the degree of deterioration of the TWC is monitored in real time, and the current oxygen storage capacity of the TWC is determined based on the degree of deterioration; finally, the emission status of the engine is adjusted based on the current oxygen storage capacity, the first mapping relationship, and the second mapping relationship to ensure that the emission status meets the emission standards.
[0039] Therefore, this invention, by acquiring the oxygen storage capacity of three-way catalytic converters (TWCs) at different deterioration levels and establishing a mapping relationship between this oxygen storage capacity and the throttle opening and the set value of the rear oxygen sensor voltage, enables the engine control parameters (i.e., throttle opening and rear oxygen sensor voltage set value) to adapt to the TWC deterioration state in real time. This avoids the problem of air-fuel ratio inaccuracy caused by the decrease in the oxygen storage capacity of the TWC, ensuring that the TWC meets emission requirements throughout its entire life cycle. Thus, while ensuring that oil consumption is at a reasonable level, it can effectively increase the exhaust temperature of the engine under various operating conditions, thereby increasing the temperature of the after-treatment device, and adapting to the ignition temperature of the after-treatment device at different stages. This improves the exhaust emission level of the vehicle and reduces energy consumption. Attached Figure Description
[0040] Figure 1 This is a flowchart of an engine aftertreatment catalyst control method provided in an embodiment of the present invention;
[0041] Figure 2 This is a flowchart of another engine aftertreatment catalyst control method provided in an embodiment of the present invention;
[0042] Figure 3 This is a schematic diagram of the structure of an engine aftertreatment catalyst control device provided in an embodiment of the present invention;
[0043] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation
[0044] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0045] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The singular forms “a,” “said,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.
[0046] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.
[0047] It should be understood that although the terms first, second, third, etc., may be used in the embodiments of this application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, first may also be referred to as second without departing from the scope of the embodiments of this application, and similarly, second may also be referred to as first.
[0048] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”
[0049] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.
[0050] It should be noted that any symbols and / or numbers present in the specification that are not marked in the accompanying drawings are not reference numerals.
[0051] As mentioned in the background technology, traditional TWC control strategies are not fully adapted to the entire life cycle degradation process of TWC. Through careful research, the applicant found that existing domestic and international China VI natural gas engines primarily employ stoichiometric combustion and TWC technologies. However, due to cost competition, the amount of precious metals is gradually decreasing, currently down to 15g. This reduces the amount of fresh TWC active components, slightly decreasing ignition capability (the ignition temperature increases by 18°C when the precious metal content decreases from 30g to 15g), and the conversion efficiency window also narrows accordingly. Simultaneously, with the degradation of the aftertreatment system, ignition capability further decreases (the ignition temperature increases by another 15-20°C after aftertreatment degradation), further narrowing the conversion efficiency window. Furthermore, the three-way catalytic converter, the core purification device in the automotive exhaust system, is primarily responsible for converting harmful substances such as CO, HC, CH4, and NOx in the exhaust gas into harmless carbon dioxide, water, and nitrogen through efficient oxidation and reduction reactions. It is known that the oxygen storage materials and noble metal components in three-way catalysts possess oxygen storage capabilities, and this oxygen storage capacity is closely related to the conversion efficiency of the catalyst. Since catalytic efficiency is related to oxygen storage, monitoring strategies can be used to evaluate the catalytic efficiency of the catalyst based on the calculation of oxygen storage capacity (OSC / Oxygen Storage Capacity) by oxygen sensors.
[0052] Furthermore, with specialized combustion design, transient control, and insulation of the exhaust pipe and after-treatment system to improve exhaust temperature, the China VI natural gas engine can generally guarantee the ignition temperature of the three-way catalytic converter under normal combustion conditions. However, under towing conditions (FSO / Fuel Shutoff) and with the gradual aging of the after-treatment system, the ignition temperature of the after-treatment system becomes difficult to guarantee. Simultaneously, under FSO conditions, for natural gas engines with a throttle valve, the engine oil consumption during towing must be considered, thus requiring the throttle valve to open to a certain angle. However, the increased throttle opening during towing introduces a large amount of fresh air, which lowers the exhaust temperature, thereby affecting the ignition temperature of the three-way catalytic converter.
[0053] Therefore, after fully considering the above factors, the applicant proposes the following solution to resolve the aforementioned technical problems:
[0054] Figure 1 This is a flowchart of an engine aftertreatment catalyst control method provided by an embodiment of the present invention. This embodiment is at least applicable to the control scenario of engine aftertreatment catalysts. The engine aftertreatment catalyst control method can be, but is not limited to, executed by the engine aftertreatment catalyst control device in this embodiment of the present invention as the execution subject. This execution subject can be implemented in software and / or hardware. Figure 1 As shown, the engine aftertreatment catalyst control method includes at least the following steps:
[0055] S1. Obtain the oxygen storage capacity corresponding to at least one type of three-way catalyst (TWC) with varying degrees of degradation.
[0056] The degree of degradation can be the health status of the three-way catalytic converter, which can be classified as excellent, good, poor, etc.
[0057] S2. Construct the first mapping relationship between each oxygen storage quantity and throttle opening value under specific engine operating conditions.
[0058] The specific engine operating conditions can be reverse towing (FSO / Fuel Shutoff), idling, low, medium, and high load conditions. The first mapping relationship can be stored in the form of a database table. In the first mapping relationship, each specific engine operating condition and each oxygen storage capacity uniquely corresponds to a throttle opening value.
[0059] S3. Construct a second mapping relationship between each oxygen storage quantity and the voltage setting value of the rear oxygen sensor under specific engine operating conditions.
[0060] The rear oxygen sensor is used to provide feedback on the oxygen content in the exhaust gas, and its voltage (i.e., the rear oxygen sensor voltage setpoint) is used to control the engine's air-fuel ratio. The second mapping relationship can be stored in the form of a database table. In this second mapping relationship, each specific engine operating condition and each oxygen storage level uniquely corresponds to a rear oxygen sensor voltage setpoint.
[0061] S4. During actual engine operation, monitor the degree of TWC degradation in real time and determine the current oxygen storage capacity of TWC based on the degree of degradation.
[0062] The actual operation of an engine can be understood as the engine maintaining a steady state under certain specific operating conditions.
[0063] S5. Adjust the engine's emission status based on the current oxygen storage, the first mapping relationship, and the second mapping relationship to ensure that the emission status meets the emission standards.
[0064] Among them, emission status can be understood as the hazardous situation of engine emissions.
[0065] The technical solution provided in this embodiment firstly obtains the oxygen storage capacity corresponding to at least one degree of deterioration of the three-way catalytic converter (TWC); secondly, it establishes a first mapping relationship between each oxygen storage capacity and the throttle opening value under specific engine operating conditions; thirdly, it establishes a second mapping relationship between each oxygen storage capacity and the voltage setting value of the rear oxygen sensor under specific engine operating conditions; then, during actual engine operation, it monitors the degree of deterioration of the TWC in real time and determines the current oxygen storage capacity of the TWC based on the degree of deterioration; finally, it adjusts the engine's emission status based on the current oxygen storage capacity, the first mapping relationship, and the second mapping relationship to ensure that the emission status meets the emission standards.
[0066] Therefore, this embodiment obtains the oxygen storage capacity of three-way catalysts with different degrees of degradation and establishes a mapping relationship between it and the throttle opening and the voltage setting value of the rear oxygen sensor. This allows the engine control parameters (i.e., throttle opening and rear oxygen sensor voltage setting value) to adapt to the TWC degradation state in real time, avoiding the air-fuel ratio inaccuracy caused by the decrease in the oxygen storage capacity of the TWC. This ensures that the TWC meets emission requirements throughout its entire life cycle. Thus, while ensuring that the oil consumption is at a reasonable level, it can effectively increase the exhaust temperature of the engine under various operating conditions, thereby increasing the temperature of the after-treatment device. This adapts to the ignition temperature of the after-treatment device at different stages, improving the exhaust emission level of the vehicle and reducing energy consumption.
[0067] Based on the above embodiments or implementation methods Figure 2 This is a flowchart of another engine aftertreatment catalyst control method provided in an embodiment of the present invention. This embodiment is based on the above embodiment with additions and refinements. Figure 2 As shown, the engine aftertreatment catalyst control method includes at least the following steps:
[0068] S6. Determine the degree of degradation of at least one TWC based on the purification conversion rate of TWC.
[0069] The purification conversion rate refers to the efficiency of TWC in converting standard concentrations of pollutants (CO, HC, NOx). Different purification conversion rates can reflect different degrees of TWC degradation.
[0070] S1. Obtain the oxygen storage capacity corresponding to at least one type of three-way catalyst (TWC) with varying degrees of degradation.
[0071] S21. Select the oxygen storage capacity of TWC under a specific engine operating condition and a certain degree of degradation.
[0072] S22. Maintain steady-state operation of the engine under specific engine operating conditions and gradually adjust the throttle opening value to obtain the optimal throttle opening value that meets emission standards.
[0073] S23. Record the oxygen storage capacity of TWC and its corresponding optimal throttle opening value under all specific engine operating conditions and deterioration levels to construct the first mapping relationship.
[0074] Taking the engine's specific operating condition as a reverse towing condition as an example, the first mapping relationship can be shown in Table 1.
[0075] Table 1
[0076] Oxygen storage capacity (g) Optimal throttle opening value (%) 6.5 20 12.0 35 16.0 60 20.0 75
[0077] S31. Maintain steady-state operation of the engine under specific engine operating conditions and gradually adjust the oxygen sensor voltage setting value to obtain the optimal oxygen sensor voltage setting value that meets emission standards.
[0078] S32. Record the oxygen storage capacity of TWC and its corresponding optimal oxygen sensor voltage setting value under all specific engine operating conditions and deterioration levels to construct a second mapping relationship.
[0079] S4. During actual engine operation, monitor the degree of TWC degradation in real time and determine the current oxygen storage capacity of TWC based on the degree of degradation.
[0080] The current oxygen storage capacity can be the oxygen storage capacity corresponding to the degree of deterioration under the current engine operating scenario.
[0081] S51. Based on the current oxygen storage, call the optimal throttle opening value within the first mapping relationship.
[0082] S52. Based on the current oxygen storage, call the optimal oxygen sensor voltage setting value within the second mapping relationship.
[0083] S53. Adjust the engine's emission status based on the optimal throttle opening value and the optimal oxygen sensor voltage setting value to ensure that the emission status meets the emission standards.
[0084] The technical solution provided in this embodiment first determines the degradation degree of at least one TWC based on the purification conversion rate of TWC. Further, it obtains the oxygen storage capacity corresponding to the three-way catalytic converter TWC at at least one degradation degree. Further, it selects the oxygen storage capacity of TWC under a specific engine operating condition and a specific degradation degree. Further, it maintains steady-state operation of the engine under the specific engine operating condition and gradually adjusts the throttle opening value to obtain the optimal throttle opening value that meets emission standards. Further, it records the oxygen storage capacity of TWC under all specific engine operating conditions and degradation degrees, and their corresponding optimal throttle opening values, to construct a first mapping relationship. Further, it maintains steady-state operation of the engine under the specific engine operating condition and gradually adjusts the oxygen sensor voltage setting value to obtain the optimal oxygen sensor voltage setting value that meets emission standards. Further, it records the oxygen storage capacity of TWC under all specific engine operating conditions and degradation degrees, and their corresponding optimal oxygen sensor voltage setting values, to construct a second mapping relationship. Furthermore, during actual engine operation, the degree of TWC degradation is monitored in real time, and the current oxygen storage capacity of the TWC is determined based on the degradation level. Further, the optimal throttle opening value within the first mapping relationship is called based on the current oxygen storage capacity. Further, the optimal oxygen sensor voltage setting value within the second mapping relationship is called based on the current oxygen storage capacity. Finally, the engine's emission status is adjusted based on the optimal throttle opening value and the optimal oxygen sensor voltage setting value to ensure that the emission status meets emission standards.
[0085] Therefore, this embodiment obtains the oxygen storage capacity of three-way catalytic converters (TWCs) at different levels of degradation and establishes a mapping relationship between this oxygen storage capacity and the throttle opening and the voltage setting of the rear oxygen sensor. This allows the engine control parameters (i.e., throttle opening and rear oxygen sensor voltage setting) to adapt to the TWC degradation state in real time, avoiding air-fuel ratio inaccuracies caused by the decreased oxygen storage capacity of the TWC. This ensures that the TWC meets emission requirements throughout its entire life cycle. Thus, while maintaining reasonable oil consumption, it effectively increases the exhaust temperature under various engine operating conditions, thereby increasing the after-treatment system temperature and adapting to the ignition temperature of the after-treatment system at different stages. This improves vehicle emissions and reduces energy consumption. Furthermore, as the after-treatment system deteriorates, the conversion efficiency window narrows accordingly. This embodiment establishes a correspondence between different oxygen storage capacities (OSC) of the TWC and the oxygen balance within the after-treatment system, thereby correcting the voltage setting of the rear oxygen closed-loop and also correcting the amplitude of the front oxygen oscillation square wave signal. Therefore, this embodiment enables the TWC to operate within its most efficient window.
[0086] Figure 3 This is a schematic diagram of the structure of an engine aftertreatment catalyst control device provided in an embodiment of the present invention. This embodiment is at least applicable to the control scenario of engine aftertreatment catalysts, and the engine aftertreatment catalyst control device can be implemented in software and / or hardware. Figure 3 As shown, the engine aftertreatment catalyst control device includes at least:
[0087] The acquisition module 110 is used to acquire the oxygen storage capacity corresponding to at least one type of three-way catalyst (TWC) with a certain degree of degradation.
[0088] The first construction module 120 is used to construct the first mapping relationship between each oxygen storage quantity and the throttle opening value under specific engine operating conditions.
[0089] The second construction module 130 is used to construct a second mapping relationship between each oxygen storage quantity and the voltage setting value of the rear oxygen sensor under specific engine operating conditions.
[0090] The real-time calculation module 140 is used to monitor the degree of deterioration of the TWC in real time during actual engine operation and determine the current oxygen storage capacity of the TWC based on the degree of deterioration.
[0091] The emission control module 150 is used to adjust the engine's emission status based on the current oxygen storage, a first mapping relationship, and a second mapping relationship, so that the emission status meets the emission standards.
[0092] Optionally, it also includes:
[0093] The degradation module 160 is used to determine the degree of degradation of at least one TWC based on the purification conversion rate of TWC.
[0094] Optionally, the first building module 120 is specifically used for:
[0095] Select the oxygen storage capacity of TWC under a specific engine operating condition and a certain degree of degradation; and maintain the engine in steady-state operation under the specific engine operating condition and gradually adjust the throttle opening value to obtain the optimal throttle opening value that meets the emission standards; and record the oxygen storage capacity of TWC and its corresponding optimal throttle opening value under all specific engine operating conditions and degradation levels to construct a first mapping relationship.
[0096] Optionally, the second building module 130 is specifically used for:
[0097] Select the oxygen storage capacity of TWC under a specific engine operating condition and a certain degree of degradation; and maintain the engine in steady-state operation under the specific engine operating condition and gradually adjust the oxygen sensor voltage setting value to obtain the optimal oxygen sensor voltage setting value that meets the emission standards; and record the oxygen storage capacity of TWC and its corresponding optimal oxygen sensor voltage setting value under all specific engine operating conditions and degradation levels to construct a second mapping relationship.
[0098] Optionally, the emission control module 150 is specifically used for:
[0099] The engine's emission status is adjusted based on the current oxygen level, using the optimal throttle opening value within the first mapping relationship, the optimal oxygen sensor voltage setting value within the second mapping relationship, and the optimal throttle opening value and the optimal oxygen sensor voltage setting value, so that the emission status meets the emission standards.
[0100] The technical solution provided in this embodiment firstly acquires the oxygen storage capacity corresponding to at least one degree of deterioration of the three-way catalytic converter (TWC) through an acquisition module; further, a first mapping relationship between each oxygen storage capacity and the throttle opening value under specific engine operating conditions is constructed through a first construction module; further, a second mapping relationship between each oxygen storage capacity and the voltage setting value of the rear oxygen sensor under specific engine operating conditions is constructed through a second construction module; further, during actual engine operation, the degree of deterioration of the TWC is monitored in real time through a real-time calculation module, and the current oxygen storage capacity of the TWC is determined based on the degree of deterioration; finally, the emission control module adjusts the emission status of the engine based on the current oxygen storage capacity, the first mapping relationship, and the second mapping relationship to ensure that the emission status meets the emission standards.
[0101] Therefore, this embodiment obtains the oxygen storage capacity of three-way catalysts with different degrees of degradation and establishes a mapping relationship between it and the throttle opening and the voltage setting value of the rear oxygen sensor. This allows the engine control parameters (i.e., throttle opening and rear oxygen sensor voltage setting value) to adapt to the TWC degradation state in real time, avoiding the air-fuel ratio inaccuracy caused by the decrease in the oxygen storage capacity of the TWC. This ensures that the TWC meets emission requirements throughout its entire life cycle. Thus, while ensuring that the oil consumption is at a reasonable level, it can effectively increase the exhaust temperature of the engine under various operating conditions, thereby increasing the temperature of the after-treatment device. This adapts to the ignition temperature of the after-treatment device at different stages, improving the exhaust emission level of the vehicle and reducing energy consumption.
[0102] This embodiment provides an electronic device. Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. See also: Figure 4 The electronic device 1000 includes a processor 1001 and a memory 1002. The memory 1002 stores computer-readable instructions. When the computer-readable instructions are executed by the processor 1001, the steps in any of the above-mentioned engine aftertreatment catalyst control methods are performed. Through the above technical solution, the processor 1001 and the memory 1002 are interconnected and communicate with each other through a communication bus and / or other forms of connection mechanism (not shown). The memory 1002 stores a computer program that can be executed by the processor. When the electronic device 1000 is running, the processor 1001 executes the computer program to execute the engine aftertreatment catalyst control method in any optional implementation of the above embodiments, so as to achieve at least the following functions: obtaining the oxygen storage quantity corresponding to at least one degree of deterioration of the three-way catalyst (TWC); constructing a first mapping relationship between each oxygen storage quantity and the throttle opening value under specific engine operating conditions; constructing a second mapping relationship between each oxygen storage quantity and the voltage setting value of the rear oxygen sensor under specific engine operating conditions; during the actual operation of the engine, monitoring the degree of deterioration of the TWC in real time and determining the current oxygen storage quantity of the TWC based on the degree of deterioration; adjusting the emission state of the engine based on the current oxygen storage quantity, the first mapping relationship and the second mapping relationship so that the emission state meets the emission standards.
[0103] This embodiment provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the engine aftertreatment catalyst control method provided in all embodiments of this application: obtaining the oxygen storage capacity corresponding to at least one degree of deterioration of a three-way catalyst (TWC); constructing a first mapping relationship between each oxygen storage capacity and the throttle opening value under specific engine operating conditions; constructing a second mapping relationship between each oxygen storage capacity and the voltage setting value of the rear oxygen sensor under specific engine operating conditions; during actual engine operation, monitoring the degree of deterioration of the TWC in real time and determining the current oxygen storage capacity of the TWC based on the degree of deterioration; and adjusting the engine emission state based on the current oxygen storage capacity, the first mapping relationship, and the second mapping relationship to ensure that the emission state meets emission standards.
[0104] Any combination of one or more computer-readable media may be used. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.
[0105] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including—but not limited to—electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of transmitting, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.
[0106] The program code contained on a computer-readable medium may be transmitted using any suitable medium, including—but not limited to—wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.
[0107] Computer program code for performing the operations of this invention can be written in one or more programming languages or a combination thereof. Programming languages include object-oriented programming languages—such as Java, Smalltalk, and C++—as well as conventional procedural programming languages—such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).
[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A method for controlling an engine aftertreatment catalyst, characterized in that, At least including: Obtain the oxygen storage capacity corresponding to at least one degree of degradation of a three-way catalyst (TWC); Construct a first mapping relationship between the oxygen storage capacity and the throttle opening value for each specific engine operating condition; Construct a second mapping relationship between the oxygen storage capacity and the voltage setting value of the rear oxygen sensor under specific operating conditions of the engine; During actual engine operation, the degree of TWC degradation is monitored in real time, and the current oxygen storage capacity of TWC is determined based on the degree of degradation. The engine's emission status is adjusted based on the current oxygen storage, the first mapping relationship, and the second mapping relationship to ensure that the emission status meets emission standards.
2. The method for controlling the catalyst in engine aftertreatment according to claim 1, characterized in that, Before obtaining the oxygen storage capacity corresponding to at least one degree of degradation of the three-way catalyst TWC, the method further includes: The degree of degradation of at least one type of TWC is determined based on the purification conversion rate of TWC.
3. The method for controlling the catalyst in engine aftertreatment according to claim 1, characterized in that, The construction of the first mapping relationship between the oxygen storage capacity and the throttle opening value under specific engine operating conditions specifically includes: Select the oxygen storage capacity of TWC under a specific operating condition of the engine and a certain degree of degradation; The engine is kept running steadily under specific operating conditions, and the throttle opening value is gradually adjusted to obtain the optimal throttle opening value that meets the emission standards. Record the oxygen storage capacity of TWC under all engine specific operating conditions and the degree of degradation, and the corresponding optimal throttle opening value to construct the first mapping relationship.
4. The engine aftertreatment catalyst control method according to claim 3, characterized in that, The construction of the second mapping relationship between the oxygen storage capacity and the set value of the rear oxygen sensor under specific engine operating conditions specifically includes: Select the oxygen storage capacity of TWC under a specific operating condition of the engine and a certain degree of degradation; The engine is kept running steadily under specific operating conditions, and the oxygen sensor voltage setting value is gradually adjusted to obtain the optimal oxygen sensor voltage setting value that meets the emission standards. Record the oxygen storage capacity of the TWC under all the specific operating conditions of the engine and the degree of degradation, as well as the corresponding optimal oxygen sensor voltage setting value, to construct the second mapping relationship.
5. The engine aftertreatment catalyst control method according to claim 4, characterized in that, The step of adjusting the engine's emission status based on the current oxygen storage, the first mapping relationship, and the second mapping relationship to ensure that the emission status meets emission standards specifically includes: Based on the current oxygen storage, the optimal throttle opening value within the first mapping relationship is invoked; Based on the current oxygen storage level, the optimal oxygen sensor voltage setting value within the second mapping relationship is invoked; The engine's emission status is adjusted based on the optimal throttle opening value and the optimal oxygen sensor voltage setting value to ensure that the emission status meets emission standards.
6. An engine aftertreatment catalyst control device, characterized in that, At least including: The acquisition module is used to acquire the oxygen storage capacity corresponding to at least one type of three-way catalyst (TWC) with varying degrees of degradation. The first construction module is used to construct a first mapping relationship between the oxygen storage capacity and the throttle opening value under each specific engine operating condition. The second construction module is used to construct a second mapping relationship between the oxygen storage capacity and the voltage setting value of the rear oxygen sensor under specific operating conditions of the engine. The real-time calculation module is used to monitor the degree of degradation of TWC in real time during the actual operation of the engine and determine the current oxygen storage capacity of TWC based on the degree of degradation. An emission control module is used to adjust the emission status of the engine based on the current oxygen storage, the first mapping relationship, and the second mapping relationship, so that the emission status meets the emission standards.
7. The engine aftertreatment catalyst control device according to claim 6, characterized in that, Also includes: The degradation classification module is used to determine the degree of degradation of at least one type of TWC based on the purification conversion rate of TWC.
8. The engine aftertreatment catalyst control device according to claim 7, characterized in that, The first building module is specifically used for: Select the oxygen storage capacity of TWC under a specific engine operating condition and a certain degree of degradation; maintain the engine in steady-state operation under the specific engine operating condition and gradually adjust the throttle opening value to obtain the optimal throttle opening value that meets the emission standards; and record the oxygen storage capacity of TWC under all specific engine operating conditions and the degree of degradation and the corresponding optimal throttle opening value to construct the first mapping relationship.
9. An electronic device comprising a memory and a processor, the memory storing a computer program executable on the processor, characterized in that, When the processor executes the program, it implements the steps in the engine aftertreatment catalyst control method according to any one of claims 1 to 5.
10. 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 aftertreatment catalyst control method according to any one of claims 1 to 5.