A method and device for identifying poisoning of a diesel oxidation catalyst

Abstract

The present application provides a method and device for identifying poisoning of a diesel oxidation catalyst, specifically related to the technical field of internal combustion engines. In the present application, the type of poisoning of the diesel oxidation catalyst is identified based on thermal management means. Specifically, thermal management of the diesel oxidation catalyst is achieved by injecting diesel at different diesel injection amounts at the inlet of the diesel oxidation catalyst and performing exhaust thermal management operations on the diesel engine. The type of poisoning of the diesel oxidation catalyst is identified according to the temperature state at the outlet of the diesel oxidation catalyst under different conditions, and then different operations are performed for different types of poisoning of the diesel oxidation catalyst, which can greatly reduce the use cost of the diesel oxidation catalyst.

Description

Technical Field

[0001] The present application relates to the technical field of internal combustion engines, and particularly to a method and device for identifying poisoning of a diesel oxidation catalyst. Background Art

[0002] During the operation of a diesel engine, a large amount of particulate matter emissions are generated. Generally, by installing a diesel oxidation catalyst and a diesel particulate filter system in the exhaust tailpipe, the emission reduction target of particulate matter can be effectively achieved. When the diesel particulate filter system traps more than a certain amount of PM, diesel is actively injected at the inlet of the diesel oxidation catalyst, and the diesel undergoes an oxidation reaction and releases heat inside the diesel oxidation catalyst to ensure that there is a high enough temperature in the diesel particulate filter to burn the internal particulate matter, thereby realizing the regeneration of the diesel particulate filter. The oxidation performance of the diesel oxidation catalyst is affected by soluble organic matter or sulfur in the exhaust gas, that is, it is prone to soluble organic matter poisoning or sulfur poisoning: soluble organic matter poisoning belongs to temporary poisoning, which blocks the surface of the diesel oxidation catalyst, deteriorates the catalytic performance, increases the diesel fuel consumption, but can be detoxified by raising the exhaust gas temperature of the diesel engine to a certain value; sulfur poisoning belongs to permanent poisoning, which reduces the overall activity of the catalyst and makes it lose its catalytic function, and requires a higher temperature for detoxification.

[0003] In the prior art, by comparing the theoretical heat value generated after the diesel burns in the diesel oxidation catalyst with the actual value, it is determined whether the diesel oxidation catalyst is poisoned, but the poisoning type of the diesel oxidation catalyst cannot be identified and detoxification operations cannot be performed according to different poisoning types. Once it is identified that the diesel oxidation catalyst is poisoned, only desulfurization operations can be carried out, which greatly increases the use cost of the diesel oxidation catalyst.

[0004] In summary, how to identify the poisoning type of the diesel oxidation catalyst has become an urgent problem for those skilled in the art to solve. Summary of the Invention

[0005] In view of this, the embodiments of the present application provide a method and device for identifying poisoning of a diesel oxidation catalyst, aiming to identify the poisoning type of the diesel oxidation catalyst.

[0006] In a first aspect, the embodiments of the present application provide a method for identifying poisoning of a diesel oxidation catalyst, the method comprising:

[0007] Inject diesel at the inlet of the diesel oxidation catalyst according to a first diesel injection amount, where the first diesel injection amount is the diesel injection amount required for the outlet of the diesel oxidation catalyst to reach a first preset temperature within a first preset time under normal conditions;

[0008] If the outlet of the diesel oxidation catalyst does not reach the first preset temperature within the first preset time, perform the first operation of injecting diesel at the inlet of the diesel oxidation catalyst according to the second diesel injection amount, where the second diesel injection amount is the diesel injection amount required for the outlet of the diesel oxidation catalyst to reach the second preset temperature within the second preset time under normal conditions, and the second preset temperature is less than the first preset temperature;

[0009] If the outlet of the diesel oxidation catalyst does not reach the second preset temperature within the second preset time, stop injecting diesel at the inlet of the diesel oxidation catalyst, and perform an exhaust heat management operation on the diesel engine to make the outlet of the diesel oxidation catalyst reach the third preset temperature, where the third preset temperature is less than the second preset temperature;

[0010] If the time for the outlet of the diesel oxidation catalyst to continuously reach the third preset temperature exceeds the third preset time, perform the second operation of injecting diesel at the inlet of the diesel oxidation catalyst according to the second diesel injection amount;

[0011] If the outlet of the diesel oxidation catalyst does not reach the second preset temperature within the second preset time, identify that the diesel oxidation catalyst is in a sulfur poisoning state;

[0012] If the outlet of the diesel oxidation catalyst reaches the second preset temperature within the second preset time, identify that the diesel oxidation catalyst is in a soluble organic matter poisoning state.

[0013] Optionally, after injecting diesel at the inlet of the diesel oxidation catalyst according to the first diesel injection amount, the method further includes:

[0014] If the outlet of the diesel oxidation catalyst reaches the first preset temperature within the first preset time, identify that the diesel oxidation catalyst is in an unpoisoned state;

[0015] The diesel particulate filter performs active regeneration.

[0016] Optionally, after performing the first operation of injecting diesel at the inlet of the diesel oxidation catalyst according to the second diesel injection amount, the method further includes:

[0017] If the outlet of the diesel oxidation catalyst reaches the second preset temperature within the second preset time, perform the step of injecting diesel at the inlet of the diesel oxidation catalyst according to the first diesel injection amount.

[0018] Optionally, after performing the second operation of injecting diesel at the inlet of the diesel oxidation catalyst according to the second diesel injection amount, the method further includes:

[0019] If the outlet of the diesel oxidation catalyst reaches the second preset temperature within the second preset time, perform the step of injecting diesel at the inlet of the diesel oxidation catalyst according to the first diesel injection amount.

[0020] Optionally, after identifying that the diesel oxidation catalyst is in a sulfur poisoning state, the method further includes:

[0021] Perform a stepped desulfurization regeneration operation on the diesel oxidation catalyst.

[0022] Optionally, after identifying that the diesel oxidation catalyst is in a soluble organic matter poisoning state, the method further includes:

[0023] Accumulate the number of times the diesel oxidation catalyst is identified as being in a soluble organic matter poisoning state within a preset operating time or a preset mileage;

[0024] If the accumulated number of times the diesel oxidation catalyst is identified as being in a soluble organic matter poisoning state within a preset operating time or a preset mileage is greater than a preset limit value, report a diesel engine fault.

[0025] In a second aspect, an embodiment of the present application provides a device for identifying poisoning of a diesel oxidation catalyst, the device including:

[0026] An injection module for injecting diesel at the inlet of the diesel oxidation catalyst according to a first diesel injection amount, where the first diesel injection amount is the diesel injection amount required for the outlet of the diesel oxidation catalyst to reach a first preset temperature within a first preset time under normal conditions;

[0027] The injection module is further configured to, if the outlet of the diesel oxidation catalyst does not reach the first preset temperature within the first preset time, inject diesel at the inlet of the diesel oxidation catalyst according to a second diesel injection amount, where the second diesel injection amount is the diesel injection amount required for the outlet of the diesel oxidation catalyst to reach a second preset temperature within a second preset time under normal conditions, and the second preset temperature is less than the first preset temperature;

[0028] The injection module is further configured to, if the outlet of the diesel oxidation catalyst does not reach the second preset temperature within the second preset time, stop injecting diesel at the inlet of the diesel oxidation catalyst;

[0029] A hot exhaust gas management module for performing exhaust gas heat management operation on the diesel engine to make the outlet of the diesel oxidation catalyst reach a third preset temperature, where the third preset temperature is less than the second preset temperature;

[0030] The injection module is further configured to inject diesel at the inlet of the diesel oxidation catalyst according to the second diesel injection amount if the time for the outlet of the diesel oxidation catalyst to continuously reach the third preset temperature exceeds the third preset time.

[0031] The identification module is configured to identify that the diesel oxidation catalyst is in a sulfur poisoning state if the outlet of the diesel oxidation catalyst does not reach the second preset temperature within the second preset time.

[0032] The identification module is further configured to identify that the diesel oxidation catalyst is in a soluble organic matter poisoning state if the outlet of the diesel oxidation catalyst reaches the second preset temperature within the second preset time.

[0033] Optionally, the device includes:

[0034] The identification module is further configured to identify that the diesel oxidation catalyst is in an unpoisoned state if the outlet of the diesel oxidation catalyst reaches the first preset temperature within the first preset time.

[0035] The regeneration module is configured to perform active regeneration on the diesel particulate filter.

[0036] Optionally, the injection module is further configured to execute the step of injecting diesel at the inlet of the diesel oxidation catalyst according to the first diesel injection amount if the outlet of the diesel oxidation catalyst reaches the second preset temperature within the second preset time.

[0037] Optionally, the device includes:

[0038] The accumulation module is configured to accumulate the number of times the diesel oxidation catalyst is identified as being in a soluble organic matter poisoning state within a preset operation time or a preset mileage.

[0039] The reporting module is configured to report a diesel engine fault if the number of times the diesel oxidation catalyst is identified as being in a soluble organic matter poisoning state within a preset operation time or a preset mileage is greater than a preset limit value.

[0040] An embodiment of the present application provides a method for identifying poisoning of a diesel oxidation catalyst. When implementing the method, diesel is first injected at the inlet of the diesel oxidation catalyst according to a first diesel injection amount, where the first diesel injection amount is the diesel injection amount required for the outlet of the diesel oxidation catalyst to reach a first preset temperature within a first preset time under normal conditions. If the outlet of the diesel oxidation catalyst does not reach the first preset temperature within the first preset time, an operation of injecting diesel at the inlet of the diesel oxidation catalyst for the first time according to a second diesel injection amount is performed, where the second diesel injection amount is the diesel injection amount required for the outlet of the diesel oxidation catalyst to reach a second preset temperature within a second preset time under normal conditions, and the second preset temperature is less than the first preset temperature. If the outlet of the diesel oxidation catalyst does not reach the second preset temperature within the second preset time, the injection of diesel at the inlet of the diesel oxidation catalyst is stopped, and an exhaust heat management operation is performed on the diesel engine to make the outlet of the diesel oxidation catalyst reach a third preset temperature, where the third preset temperature is less than the second preset temperature. If the time during which the outlet of the diesel oxidation catalyst continuously reaches the third preset temperature exceeds a third preset time, an operation of injecting diesel at the inlet of the diesel oxidation catalyst for the second time according to the second diesel injection amount is performed. If the outlet of the diesel oxidation catalyst does not reach the second preset temperature within the second preset time, it is identified that the diesel oxidation catalyst is in a sulfur poisoning state. If the outlet of the diesel oxidation catalyst reaches the second preset temperature within the second preset time, it is identified that the diesel oxidation catalyst is in a soluble organic matter poisoning state. In this way, heat management of the diesel oxidation catalyst is achieved by injecting diesel at different diesel injection amounts at the inlet of the diesel oxidation catalyst and performing an exhaust heat management operation on the diesel engine, and the poisoning type of the diesel oxidation catalyst is identified according to the temperature state of the outlet of the diesel oxidation catalyst under different conditions. Furthermore, different operations can be performed for different poisoning types of the diesel oxidation catalyst, which can greatly reduce the use cost of the diesel oxidation catalyst. Description of the Drawings

[0041] To more clearly illustrate the technical solutions in this embodiment or the prior art, the following will briefly introduce the drawings required for the description of the embodiment or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0042] Figure 1 It is a flowchart of a method for identifying poisoning of a diesel oxidation catalyst provided by an embodiment of the present application;

[0043] Figure 2 It is another flowchart of a method for identifying poisoning of a diesel oxidation catalyst provided by an embodiment of the present application;

[0044] Figure 3 A structural schematic diagram of a device for identifying poisoning of a diesel oxidation catalyst provided by an embodiment of the present application. Detailed implementation manners

[0045] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. A method and device for identifying poisoning of a diesel oxidation catalyst provided by the present application are used in the technical field of internal combustion engines. The above is only an example and does not limit the application fields of the names of the method and device provided by the present application.

[0046] The oxidation performance of a diesel oxidation catalyst is affected by soluble organic matter or sulfur in the exhaust gas, that is, it is prone to soluble organic matter poisoning or sulfur poisoning: Soluble organic matter poisoning belongs to temporary poisoning, which blocks the surface of the diesel oxidation catalyst, deteriorates the catalytic performance, increases the diesel fuel consumption, but can be detoxified by raising the exhaust gas temperature of the diesel engine to a certain value; Sulfur poisoning belongs to permanent poisoning, which reduces the overall activity of the catalyst and makes it lose its catalytic function, and requires a higher temperature for detoxification.

[0047] In the prior art, whether the diesel oxidation catalyst is poisoned is judged by comparing the theoretical heat value and the actual value generated after diesel combustion in the diesel oxidation catalyst, but the poisoning type of the diesel oxidation catalyst cannot be identified and detoxification operations cannot be performed according to different poisoning types. Once it is identified that the diesel oxidation catalyst is poisoned, only desulfurization operations can be carried out, which greatly increases the use cost of the diesel oxidation catalyst.

[0048] The inventor has proposed the technical solution of the present application through injecting diesel at different diesel injection amounts at the inlet of the diesel oxidation catalyst and performing exhaust gas thermal management operations on the diesel engine to achieve thermal management of the diesel oxidation catalyst, and identifying the poisoning type of the diesel oxidation catalyst according to the temperature state at the outlet of the diesel oxidation catalyst under different conditions. Furthermore, different operations can be carried out for different poisoning types of the diesel oxidation catalyst, which can greatly reduce the use cost of the diesel oxidation catalyst.

[0049] In order to enable those skilled in the art to better understand the solution of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific implementation manners. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0050] See Figure 1 , Figure 1 A method flow chart of a method for identifying poisoning of a diesel oxidation catalyst provided by an embodiment of the present application, including:

[0051] S101: Inject diesel at the inlet of the diesel oxidation catalyst according to the first diesel injection amount.

[0052] The main function of the diesel oxidation catalyst is to eliminate combustible gases and soluble organic components in the exhaust gas, such as HC, CO, etc. The catalysts in the diesel oxidation catalyst generally use precious metals such as platinum (Pt) and rhodium (Rh). When the exhaust gas of the diesel engine passes through the catalyst, HC, etc. can quickly carry out chemical reactions with the oxygen in the exhaust gas at a relatively low temperature, achieving the purpose of purifying HC and oxidizing and releasing heat.

[0053] Inject diesel at the inlet of the diesel oxidation catalyst according to the first diesel injection amount, where the first diesel injection amount is the diesel injection amount required for the outlet of the diesel oxidation catalyst to reach the first preset temperature within the first preset time under normal conditions. That is, under normal conditions, the heat generated by the combustion of the first diesel injection amount and the heat released by the reaction of hydrocarbons with oxygen under the action of catalysis can make the outlet of the diesel oxidation catalyst reach the first preset temperature within the first preset time. The first preset time is preset in advance, such as 3 minutes, and the first preset temperature is also preset, such as 550 °C.

[0054] For example, if the first preset time is 3 minutes and the first preset temperature is 550 °C, the first diesel injection amount is the diesel injection amount that, under normal conditions, the heat generated by combustion and the heat released by the reaction of hydrocarbons with oxygen under the action of catalysis can make the outlet of the diesel oxidation catalyst reach 550 °C within 3 minutes.

[0055] S102: Determine whether the outlet of the diesel oxidation catalyst reaches the first preset temperature within the first preset time.

[0056] Continuously collect the temperature at the outlet of the diesel oxidation catalyst, and determine whether the temperature at the outlet of the diesel oxidation catalyst is greater than the preset temperature, that is, the first preset temperature, when the first preset time arrives.

[0057] If the outlet of the diesel oxidation catalyst reaches the first preset temperature within the first preset time, proceed to step S103; if the outlet of the diesel oxidation catalyst cannot reach the first preset temperature within the first preset time, proceed to step S104.

[0058] S103: Identify that the diesel oxidation catalyst is in an unpoisoned state.

[0059] If the outlet of the diesel oxidation catalyst reaches the first preset temperature within the first preset time, it indicates that the diesel oxidation catalyst can normally burn diesel, and the catalyst can also normally catalyze the reaction of hydrocarbons with oxygen to release heat. Thus, it is identified that the diesel oxidation catalyst is in an unpoisoned state.

[0060] S104: Inject diesel at the inlet of the diesel oxidation catalyst according to the second diesel injection amount.

[0061] Inject diesel at the inlet of the diesel oxidation catalyst according to the second diesel injection amount, where the second diesel injection amount is the diesel injection amount required for the outlet of the diesel oxidation catalyst to reach the second preset temperature within the second preset time under normal conditions. That is, under normal conditions, the heat generated by the combustion of the second diesel injection amount and the heat released by the reaction of hydrocarbons with oxygen under catalysis can make the outlet of the diesel oxidation catalyst reach the second preset temperature within the second preset time. The second preset time is preset in advance, for example, 5 minutes, and the second preset temperature is also preset, for example, 450 °C. The second preset temperature is less than the first preset temperature.

[0062] If the outlet of the diesel oxidation catalyst cannot reach the second preset temperature within the second preset time, it means that the diesel oxidation catalyst is in a potentially poisoned state and cannot directly perform active regeneration on the diesel particulate filter, but further operations are required to determine whether the diesel oxidation catalyst is really poisoned.

[0063] S105: Judge whether the outlet of the diesel oxidation catalyst reaches the second preset temperature within the second preset time.

[0064] Continuously collect the temperature at the outlet of the diesel oxidation catalyst and judge whether the temperature at the outlet of the diesel oxidation catalyst is greater than the preset temperature, that is, the second preset temperature, when the second preset time arrives.

[0065] If the outlet of the diesel oxidation catalyst reaches the second preset temperature within the second preset time, go to step S107; if the outlet of the diesel oxidation catalyst cannot reach the second preset temperature within the second preset time, go to step S106.

[0066] S106: Stop injecting diesel at the inlet of the diesel oxidation catalyst and perform exhaust heat management operation on the diesel engine to make the outlet of the diesel oxidation catalyst reach the third preset temperature until the time when the outlet of the diesel oxidation catalyst continuously reaches the third preset temperature exceeds the third preset time.

[0067] If the outlet of the diesel oxidation catalyst cannot reach the second preset temperature within the second preset time, it indicates that the diesel oxidation catalyst is truly poisoned. Stop injecting diesel at the inlet of the diesel oxidation catalyst and start the exhaust heat management operation of the diesel engine. During the continuous heating process, make the outlet of the diesel oxidation catalyst reach the third preset temperature. The entire exhaust heat management operation continues until the time when the outlet of the diesel oxidation catalyst continuously reaches the third preset temperature exceeds the third preset time. Among them, the third preset temperature and the third preset time are both preset in advance. The third preset temperature can be 350 °C, and the third preset time can be 15 minutes. The third preset temperature is less than the second preset temperature. During the continuous heating process of the diesel oxidation catalyst, the poisoned state may be weakened or completely eliminated.

[0068] S107: Execute the step of injecting diesel at the inlet of the diesel oxidation catalyst according to the first diesel injection amount.

[0069] If the outlet of the diesel oxidation catalyst reaches the second preset temperature within the second preset time, it indicates that the diesel oxidation catalyst may not be poisoned. It's just that there are more impurities attached to the catalyst, affecting the efficiency of the catalytic reaction. During the continuous heating process, the impurities on the catalyst will be eliminated.

[0070] S108: Inject diesel at the inlet of the diesel oxidation catalyst according to the second diesel injection amount.

[0071] Inject diesel at the inlet of the diesel oxidation catalyst again according to the second diesel injection amount, and further operations are required to determine whether the diesel oxidation catalyst is truly poisoned.

[0072] S109: Determine whether the outlet of the diesel oxidation catalyst reaches the second preset temperature within the second preset time.

[0073] Continuously collect the temperature at the outlet of the diesel oxidation catalyst, and determine whether the temperature at the outlet of the diesel oxidation catalyst is greater than the preset temperature, that is, the second preset temperature, when the second preset time arrives.

[0074] If the outlet of the diesel oxidation catalyst reaches the second preset temperature within the second preset time, proceed to step S111; if the outlet of the diesel oxidation catalyst cannot reach the second preset temperature within the second preset time, proceed to step S110.

[0075] S110: Identify that the diesel oxidation catalyst is in a sulfur poisoning state.

[0076] After a long-time heating treatment, if the outlet of the diesel oxidation catalyst still cannot reach the second preset temperature within the second preset time, the poisoning state of the diesel oxidation catalyst is identified as the sulfur poisoning state. Among them, sulfur poisoning belongs to permanent poisoning, which reduces the overall activity of the catalyst and makes it lose its catalytic effect.

[0077] S111: Identify that the diesel oxidation catalyst is in a state of poisoning by soluble organic matter.

[0078] After a long-time heating treatment, if the outlet of the diesel oxidation catalyst can reach the second preset temperature within the second preset time, the poisoning state of the diesel oxidation catalyst is identified as the poisoning state by soluble organic matter. Among them, the poisoning by soluble organic matter belongs to temporary poisoning, which blocks the surface of the diesel oxidation catalyst, deteriorates the catalytic performance, and increases the diesel fuel consumption. However, it can be detoxified by raising the exhaust temperature of the diesel engine to a certain value (such as 300 °C).

[0079] In the embodiment of the present application, heat management of the diesel oxidation catalyst is achieved by injecting diesel at different diesel injection amounts at the inlet of the diesel oxidation catalyst and performing exhaust heat management operations on the diesel engine. The poisoning type of the diesel oxidation catalyst is identified according to the temperature state of the outlet of the diesel oxidation catalyst under different conditions, and then different operations are performed for different poisoning types of the diesel oxidation catalyst, which can greatly reduce the use cost of the diesel oxidation catalyst.

[0080] In the embodiment of the present application, there are various possible implementation manners, which will be introduced separately below. It should be noted that the implementation manners given in the following introduction are only for illustrative purposes and do not represent all the implementation manners of the embodiment of the present application.

[0081] In the prior art, different treatment methods are not provided for different poisoning states. Based on this, the following implementation manners are proposed in the present application:

[0082] See Figure 2 , which is another method flowchart of the method for identifying the poisoning of the diesel oxidation catalyst provided by the embodiment of the present application.

[0083] The implementation steps of S201 to S211 are the same as those of S101 to S111, and will not be repeated here.

[0084] S212: The diesel particulate filter performs active regeneration.

[0085] When the diesel oxidation catalyst is identified as not poisoned, the diesel particulate filter performs active regeneration. The diesel particulate filter reduces emissions by adsorbing or filtering carbon particles in the diesel exhaust. When the amount of particles trapped by the diesel particulate filter reaches a certain value, diesel is sprayed in the front section of the diesel oxidation catalyst, and the diesel oxidizes and releases heat inside the diesel oxidation catalyst, increasing the temperature in the diesel particulate filter and burning the carbon particles trapped in the diesel particulate filter to achieve the regeneration of the diesel particulate filter.

[0086] S213: Perform stepwise desulfurization regeneration operation on the diesel oxidation catalyst.

[0087] When the diesel oxidation catalyst is identified as being in a sulfur poisoning state, simple heating cannot relieve the sulfur poisoning state. Stepwise desulfurization regeneration of the diesel oxidation catalyst can relieve the sulfur poisoning state.

[0088] S214: Accumulate the number of times the diesel oxidation catalyst is identified as being in a soluble organic matter poisoning state within a preset operating time or preset mileage.

[0089] The diesel oxidation catalyst often shows a soluble organic matter poisoning state. Record and accumulate the number of times the diesel oxidation catalyst is identified as being in a soluble organic matter poisoning state within a preset operating time or preset mileage.

[0090] S215: If the accumulated number of times the diesel oxidation catalyst is identified as being in a soluble organic matter poisoning state within a preset operating time or preset mileage is greater than a preset limit value, report a diesel engine fault.

[0091] When the number of times the diesel oxidation catalyst is identified as being in a soluble organic matter poisoning state within a preset operating time or preset mileage is small, that is, when the accumulated number of times the diesel oxidation catalyst is identified as being in a soluble organic matter poisoning state within a preset operating time or preset mileage is less than the preset limit value, it is considered that the diesel engine has not malfunctioned, and continue with the identification and disinfection operation. If the number of times the diesel oxidation catalyst is identified as being in a soluble organic matter poisoning state within a preset operating time or preset mileage is large, that is, when the accumulated number of times the diesel oxidation catalyst is identified as being in a soluble organic matter poisoning state within a preset operating time or preset mileage is greater than the preset limit value, it is considered that the diesel engine has malfunctioned, and stop the identification and disinfection operation.

[0092] The specific implementation method of this embodiment performs different operations for different poisoning types of the diesel oxidation catalyst, which can greatly reduce the use cost of the diesel oxidation catalyst.

[0093] The above are some specific implementation manners of the method for identifying the poisoning of a diesel oxidation catalyst provided by the embodiments of the present application. Based on this, the present application also provides a corresponding device. The device provided by the embodiments of the present application will be introduced from the perspective of functional modularization below.

[0094] See Figure 3 the structural schematic diagram of the device 300 for identifying the poisoning of a diesel oxidation catalyst shown in the figure. The device 300 includes:

[0095] An injection module 310, configured to inject diesel at the inlet of the diesel oxidation catalyst according to a first diesel injection amount, where the first diesel injection amount is the diesel injection amount required for the outlet of the diesel oxidation catalyst to reach a first preset temperature within a first preset time under normal conditions;

[0096] The injection module 310 is further configured to, if the outlet of the diesel oxidation catalyst does not reach the first preset temperature within the first preset time, inject diesel at the inlet of the diesel oxidation catalyst according to a second diesel injection amount, where the second diesel injection amount is the diesel injection amount required for the outlet of the diesel oxidation catalyst to reach a second preset temperature within a second preset time under normal conditions, and the second preset temperature is less than the first preset temperature;

[0097] The injection module 310 is further configured to, if the outlet of the diesel oxidation catalyst does not reach the second preset temperature within the second preset time, stop injecting diesel at the inlet of the diesel oxidation catalyst;

[0098] A hot exhaust gas management module 320, configured to perform exhaust heat management operations on the diesel engine to make the outlet of the diesel oxidation catalyst reach a third preset temperature, where the third preset temperature is less than the second preset temperature;

[0099] The injection module 310 is further configured to, if the time for the outlet of the diesel oxidation catalyst to continuously reach the third preset temperature exceeds a third preset time, inject diesel at the inlet of the diesel oxidation catalyst according to the second diesel injection amount;

[0100] An identification module 330, configured to, if the outlet of the diesel oxidation catalyst does not reach the second preset temperature within the second preset time, identify that the diesel oxidation catalyst is in a sulfur poisoning state;

[0101] The identification module 330 is further configured to, if the outlet of the diesel oxidation catalyst reaches the second preset temperature within the second preset time, identify that the diesel oxidation catalyst is in a soluble organic matter poisoning state.

[0102] Optionally, the device 300 for identifying the poisoning of a diesel oxidation catalyst includes:

[0103] The recognition module 330 is further configured to recognize that the diesel oxidation catalyst is in an unpoisoned state if the outlet of the diesel oxidation catalyst reaches the first preset temperature within the first preset time.

[0104] The regeneration module is used for active regeneration of the diesel particulate filter.

[0105] Optionally, the injection module 310 is further configured to perform the step of injecting diesel at the inlet of the diesel oxidation catalyst according to the first diesel injection amount if the outlet of the diesel oxidation catalyst reaches the second preset temperature within the second preset time.

[0106] Optionally, the device 300 for recognizing poisoning of the diesel oxidation catalyst includes:

[0107] The desulfurization module is used for performing a stepwise desulfurization and regeneration operation on the diesel oxidation catalyst.

[0108] Optionally, the device 300 for recognizing poisoning of the diesel oxidation catalyst includes:

[0109] The accumulation module is used for accumulating the number of times that the diesel oxidation catalyst is recognized as being in a state of soluble organic matter poisoning within a preset operation time or a preset mileage.

[0110] The reporting module is used for reporting a diesel engine fault if the number of times that the diesel oxidation catalyst is recognized as being in a state of soluble organic matter poisoning within a preset operation time or a preset mileage is greater than a preset limit value.

[0111] The embodiment of the present application further provides a corresponding device and a computer storage medium for implementing the solution provided by the embodiment of the present application.

[0112] Wherein, the device includes a memory and a processor, the memory is used for storing instructions or codes, and the processor is used for executing the instructions or codes so that the device executes the method described in any embodiment of the present application.

[0113] The computer storage medium stores codes, and when the codes are run, the device running the codes implements the method described in any embodiment of the present application.

[0114] As can be seen from the description of the above embodiments, those skilled in the art can clearly understand that all or part of the steps in the above method embodiments can be implemented by means of software plus a general hardware platform. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a storage medium, such as a read-only memory (ROM) / RAM, magnetic disk, optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network communication device such as a router) to execute the methods described in various embodiments or some parts of the embodiments of the present application.

[0115] Each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the device embodiments, since they are basically similar to the method embodiments, they are described relatively simply. For the relevant parts, reference can be made to the partial description of the method embodiments. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0116] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

[0117] It should also be noted that the various embodiments in this specification are described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other, and the key points of each embodiment are the differences from other embodiments. In particular, for the embodiments of the device and apparatus, since they are basically similar to the method embodiments, the description is relatively simple, and reference can be made to the corresponding parts of the method embodiments for the relevant content. The device and apparatus embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components referred to as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0118] As described above, this is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for identifying poisoning of a diesel oxidation catalyst, characterized in that, The method includes: Injecting diesel at the inlet of the diesel oxidation catalyst according to a first diesel injection amount, where the first diesel injection amount is the amount of diesel required for the outlet of the diesel oxidation catalyst to reach a first preset temperature within a first preset time under normal conditions; If the outlet of the diesel oxidation catalyst does not reach the first preset temperature within the first preset time, then perform an operation of injecting diesel at the inlet of the diesel oxidation catalyst for the first time according to a second diesel injection amount, where the second diesel injection amount is the amount of diesel required for the outlet of the diesel oxidation catalyst to reach a second preset temperature within a second preset time under normal conditions, and the second preset temperature is less than the first preset temperature; If the outlet of the diesel oxidation catalyst does not reach the second preset temperature within the second preset time, then stop injecting diesel at the inlet of the diesel oxidation catalyst and perform an exhaust heat management operation on the diesel engine to make the outlet of the diesel oxidation catalyst reach a third preset temperature, where the third preset temperature is less than the second preset temperature; If the time during which the outlet of the diesel oxidation catalyst continuously reaches the third preset temperature exceeds a third preset time, then perform an operation of injecting diesel at the inlet of the diesel oxidation catalyst for the second time according to the second diesel injection amount; If the outlet of the diesel oxidation catalyst does not reach the second preset temperature within the second preset time, then identify that the diesel oxidation catalyst is in a sulfur poisoning state; If the outlet of the diesel oxidation catalyst reaches the second preset temperature within the second preset time, then identify that the diesel oxidation catalyst is in a soluble organic matter poisoning state.

2. The method according to claim 1, characterized in that, After injecting diesel at the inlet of the diesel oxidation catalyst according to the first diesel injection amount, the method further includes: If the outlet of the diesel oxidation catalyst reaches the first preset temperature within the first preset time, then identify that the diesel oxidation catalyst is in an unpoisoned state; The diesel particulate filter performs active regeneration.

3. The method according to claim 1, characterized in that, After performing the operation of injecting diesel at the inlet of the diesel oxidation catalyst for the first time according to the second diesel injection amount, the method further includes: If the outlet of the diesel oxidation catalyst reaches the second preset temperature within the second preset time, then perform the step of injecting diesel at the inlet of the diesel oxidation catalyst according to the first diesel injection amount.

4. The method according to claim 1, characterized in that, After performing the operation of injecting diesel at the inlet of the diesel oxidation catalyst for the second time according to the second diesel injection amount, the method further includes: If the outlet of the diesel oxidation catalyst reaches the second preset temperature within the second preset time, then perform the step of injecting diesel at the inlet of the diesel oxidation catalyst according to the first diesel injection amount.

5. The method according to claim 1, characterized in that, After identifying that the diesel oxidation catalyst is in a sulfur poisoning state, the method further includes: Performing a stepwise desulfurization regeneration operation on the diesel oxidation catalyst.

6. The method according to claim 1, characterized in that, After identifying that the diesel oxidation catalyst is in a soluble organic matter poisoning state, the method further includes: Accumulate the number of times the diesel oxidation catalyst is identified as being in a soluble organic matter poisoning state within a preset operating time or a preset mileage; If the accumulated number of times the diesel oxidation catalyst is identified as being in a soluble organic matter poisoning state within a preset operating time or a preset mileage is greater than a preset limit value, report a diesel engine fault.

7. A device for identifying poisoning of a diesel oxidation catalyst, characterized in that, For implementing the method according to claim 1, the device includes: An injection module for injecting diesel at the inlet of the diesel oxidation catalyst according to a first diesel injection amount, where the first diesel injection amount is the diesel injection amount required for the outlet of the diesel oxidation catalyst to reach a first preset temperature within a first preset time under normal conditions; The injection module is further configured to, if the outlet of the diesel oxidation catalyst does not reach the first preset temperature within the first preset time, inject diesel at the inlet of the diesel oxidation catalyst according to a second diesel injection amount, where the second diesel injection amount is the diesel injection amount required for the outlet of the diesel oxidation catalyst to reach a second preset temperature within a second preset time under normal conditions, and the second preset temperature is less than the first preset temperature; The injection module is further configured to, if the outlet of the diesel oxidation catalyst does not reach the second preset temperature within the second preset time, stop injecting diesel at the inlet of the diesel oxidation catalyst; A hot exhaust gas management module for performing exhaust gas heat management operations on the diesel engine to make the outlet of the diesel oxidation catalyst reach a third preset temperature, where the third preset temperature is less than the second preset temperature; The injection module is further configured to, if the time during which the outlet of the diesel oxidation catalyst continuously reaches the third preset temperature exceeds a third preset time, inject diesel at the inlet of the diesel oxidation catalyst according to the second diesel injection amount; An identification module for identifying that the diesel oxidation catalyst is in a sulfur poisoning state if the outlet of the diesel oxidation catalyst does not reach the second preset temperature within the second preset time; The identification module is further configured to, if the outlet of the diesel oxidation catalyst reaches the second preset temperature within the second preset time, identify that the diesel oxidation catalyst is in a soluble organic matter poisoning state.

8. The device according to claim 7, characterized in that, The device includes: The identification module is further configured to, if the outlet of the diesel oxidation catalyst reaches the first preset temperature within the first preset time, identify that the diesel oxidation catalyst is in an unpoisoned state; A regeneration module for performing active regeneration on the diesel particulate filter.

9. The device according to claim 7, characterized in that, The injection module is further configured to, if the outlet of the diesel oxidation catalyst reaches the second preset temperature within the second preset time, execute the step of injecting diesel at the inlet of the diesel oxidation catalyst according to the first diesel injection amount.

10. The device according to claim 7, wherein The device includes: An accumulation module for accumulating the number of times the diesel oxidation catalyst is identified as being in a soluble organic matter poisoning state within a preset operating time or a preset mileage; A reporting module for reporting a diesel engine fault if the accumulated number of times the diesel oxidation catalyst is identified as being in a soluble organic matter poisoning state within a preset operating time or a preset mileage is greater than a preset limit value.

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