PNA state determination method and apparatus, storage medium, and electronic device

Abstract

The application provides a PNA state determination method and device, a storage medium and an electronic device. The method comprises the following steps: obtaining a water storage change amount of a PNA in a target period, and determining a theoretical heat release amount of the PNA in the target period according to the water storage change amount and a molecular sieve structure of the PNA, wherein the PNA is a molecular sieve structure; determining a first heat and a second heat, and determining an actual heat release amount of the PNA in the target period according to at least the first heat and the second heat, wherein the second heat is a heat value of exhaust gas after the exhaust gas passes through the PNA in the target period, and a difference between the second heat and the first heat is less than the actual heat release amount; comparing the theoretical heat release amount and the actual heat release amount, and determining that the PNA is in a degraded state when the actual heat release amount is less than the theoretical heat release amount. The method diagnoses the performance of the PNA by using the characteristics of water absorption and heat release of the molecular sieve, and attempts to restore the PNA capacity based on the diagnosis result.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of PNA performance determination, and in particular, to a PNA state determination method, a PNA state determination device, a computer readable storage medium and an electronic device. BACKGROUND

[0002] With the upgrading of emission regulations, the NOx emission requirements of vehicles are becoming higher and higher, so the control requirements of NOx emission of vehicles in the cold start phase will be higher. In the prior art, passive nitrogen oxide adsorbent (PNA) is generally used to solve the problem of low-temperature NOx emission on the basis of vehicle aftertreatment, so the adsorption and desorption capacity of PNA as a key component directly affects the cold state emission level of the engine. However, the prior art cannot accurately monitor the adsorption and desorption capacity of PNA, resulting in low NOx emission control capability. SUMMARY

[0003] The main purpose of the present application is to provide a PNA state determination method, a PNA state determination device, a computer readable storage medium and an electronic device to at least solve the problem that the prior art cannot accurately monitor the adsorption and desorption capacity of PNA, resulting in low NOx emission control capability.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a PNA state determination method is provided, comprising: obtaining a water storage change amount of a PNA in a target period, and determining a theoretical heat release amount of the PNA in the target period according to the water storage change amount and a molecular sieve structure of the PNA, the PNA being a molecular sieve structure, the PNA being used for adsorbing NOx in exhaust emissions, an initial time of the target period being an initial time of a current driving cycle, and an end time of the target period being a time when a change rate of the theoretical heat release amount of the PNA is less than a first threshold value; determining a first heat and a second heat, and determining an actual heat release amount of the PNA in the target period according to at least the first heat and the second heat, the first heat being a heat value of the exhaust emissions without passing through the PNA in the target period, the second heat being a heat value of the exhaust emissions after passing through the PNA in the target period, and a difference between the second heat and the first heat being less than the actual heat release amount; comparing the theoretical heat release amount and the actual heat release amount, and in the case that the actual heat release amount is less than the theoretical heat release amount, determining that the PNA is in a degraded state, and in the case that the PNA is in the degraded state, a NOx adsorption amount per unit volume of the PNA being less than a preset adsorption amount.

[0005] Optionally, the water storage change amount of the PNA in the target period is obtained, including: obtaining the first temperature and the second temperature at each time in the target period, the first temperature being an average value of the temperature of the exhaust gas before passing through the PNA in the target period, and the second temperature being an average value of the temperature of the exhaust gas after passing through the PNA in the target period; obtaining a water storage model of the PNA, the water storage model being used to represent a mapping relationship between temperature and water storage in the PNA, the water storage model being related to temperature, time, water content of the molecular sieve before dehydration, and structure of the molecular sieve; determining the average value of the first temperature and the second temperature as a PNA average temperature; and determining the water storage change amount of the PNA according to the PNA average temperature and the water storage model.

[0006] Optionally, the theoretical heat release amount of the PNA in the target period is determined according to the water storage change amount and the structure of the molecular sieve of the PNA, including: determining a water absorption heat release model according to the structure of the molecular sieve of the PNA, the water absorption heat release model representing a mapping relationship between water amount change and heat release amount; and determining the theoretical heat release amount of the PNA in the target period according to the water storage change amount and the water absorption heat release model.

[0007] Optionally, the first heat amount is obtained according to an inlet temperature of the PNA, and the second heat amount is obtained according to an outlet temperature of the PNA, and the actual heat release amount of the PNA in the target period is determined according to at least the first heat amount and the second heat amount, including: obtaining a PNA carrier heat consumption amount, the PNA carrier heat consumption amount being a heat consumption amount required when the PNA itself performs adsorption; obtaining a heat transfer loss, the heat transfer loss being a heat loss generated in a heat transfer process; and determining the actual heat release amount of the PNA in the target period according to a heat formula Q e = Q PNA后 + Q PNA载体 + Q 传热损失 - Q PNA前 , Q e being the actual heat release amount of the PNA in the target period, Q PNA后 being the second heat amount, Q PNA载体 being the PNA carrier heat consumption amount, Q 传热损失 being the heat transfer loss, and Q PNA前 being the first heat amount.

[0008] Optionally, the comparing the actual heat release amount with the theoretical heat release amount comprises: obtaining an environmental condition, the environmental condition comprising at least an ambient temperature, a deterioration coefficient, an intake temperature of the engine, and an intake humidity of the engine, the ambient temperature being a temperature of an environment where the vehicle is located, the deterioration coefficient representing a deterioration degree of the PNA at a current time, and the deterioration coefficient being related to time; determining a correction coefficient according to the environmental condition, and determining a heat release threshold value as a product of the theoretical heat release amount and the correction coefficient; and comparing the actual heat release amount with the heat release threshold value, and determining that the PNA is in the non-deterioration state when the actual heat release amount is greater than or equal to the heat release threshold value, and determining that the PNA is in the deterioration state when the actual heat release amount is less than the heat release threshold value.

[0009] Optionally, before the obtaining the water storage change amount of the PNA in the target period, the method further comprises: obtaining a storage average temperature, the storage average temperature being an average temperature of the PNA stored at an end of a last driving cycle, the average temperature of the PNA being an average temperature of the PNA from a last time of idling of the vehicle to a time of powering off of the vehicle in the last driving cycle; determining an initial water storage amount of the PNA according to the storage average temperature and a water storage model of the PNA, the water storage model being used to represent a mapping relationship between a temperature and water stored in the PNA; obtaining an aftertreatment temperature of the vehicle; and determining the water storage change amount of the PNA in the target period when the initial water storage amount is less than a first preset value and / or the aftertreatment temperature is less than a second preset value.

[0010] Optionally, after the determining that the PNA is in the deterioration state, the method further comprises: determining a working state of the PNA in a plurality of driving cycles, the working state comprising the deterioration state and a non-deterioration state; and triggering a regeneration attempt function when the working state of the PNA in two continuous driving cycles is the deterioration state, the regeneration attempt function being a function of attempting to restore the working state of the PNA from the deterioration state to the non-deterioration state.

[0011] According to another aspect of the present application, there is provided a PNA state determination apparatus, comprising: an acquisition unit configured to acquire a water storage change amount of a PNA in a target period, and determine a theoretical heat release amount of the PNA in the target period according to the water storage change amount and a molecular sieve structure of the PNA, the PNA being a molecular sieve structure, the PNA being configured to adsorb NOx in exhaust gas, an initial time point of the target period being an initial time point of a current driving cycle, and an end time point of the target period being a time point at which a change rate of the theoretical heat release amount of the PNA is less than a first threshold value; a first determination unit configured to determine a first heat and a second heat, and determine an actual heat release amount of the PNA in the target period according to at least the first heat and the second heat, the first heat being a heat value of the exhaust gas when the exhaust gas is not passing through the PNA in the target period, the second heat being a heat value of the exhaust gas after the exhaust gas passes through the PNA in the target period, and a difference between the second heat and the first heat being less than the actual heat release amount; and a second determination unit configured to compare the theoretical heat release amount and the actual heat release amount, and determine that the PNA is in a degraded state when the actual heat release amount is less than the theoretical heat release amount, and the PNA has a NOx adsorption amount per unit volume less than a preset adsorption amount when the PNA is in the degraded state.

[0012] According to another aspect of the present application, there is provided a computer readable storage medium, comprising a stored program, wherein the computer readable storage medium is caused to perform any of the PNA state determination methods when the program is executed.

[0013] According to another aspect of the present application, there is provided an electronic device, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs comprise a program for performing any of the PNA state determination methods.

[0014] With the technical solution of the present application, the above-mentioned PNA state determination method first acquires the water storage change amount of the PNA in the target period, and determines the theoretical heat release amount of the PNA in the target period according to the water storage change amount and the molecular sieve structure of the PNA. The PNA has a molecular sieve structure, and is used for adsorbing NOx in the exhaust emission. The initial time of the target period is the initial time of the current driving cycle, and the end time of the target period is the time when the change rate of the theoretical heat release amount of the PNA is less than a first threshold value. Then, the first heat and the second heat are determined, and the actual heat release amount of the PNA in the target period is determined according to at least the first heat and the second heat. The first heat is the heat value of the exhaust emission that has not passed through the PNA in the target period, and the second heat is the heat value of the exhaust emission that has passed through the PNA in the target period. The difference between the second heat and the first heat is less than the actual heat release amount. Finally, the theoretical heat release amount and the actual heat release amount are compared. In the case that the actual heat release amount is less than the theoretical heat release amount, it is determined that the PNA is in a degraded state. In the case that the PNA is in the degraded state, the NOx adsorption amount per unit volume of the PNA is less than a preset adsorption amount. The method fully utilizes the water absorption and heat release characteristics of the PNA molecular sieve to diagnose the performance of the PNA. The diagnosis is performed without NOx, which can exclude the problem of inaccurate diagnosis caused by some factors affecting NOx. The diagnosis is active, and can be performed at any time in each driving cycle. Based on the diagnosis result, the PNA capacity is tried to be recovered. The problem that the adsorption and desorption capacity of the PNA cannot be accurately monitored in the prior art, resulting in low NOx emission control capacity, is solved. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and are used to interpret the present application together with its description. In the drawings:

[0016] Figure 1 A hardware structure block diagram of a mobile terminal for performing a PNA state determination method is shown according to an embodiment of the present application;

[0017] Figure 2 A flowchart of a PNA state determination method is shown according to an embodiment of the present application;

[0018] Figure 3 A flowchart of another PNA state determination method is shown according to an embodiment of the present application;

[0019] Figure 4 A flowchart of still another PNA state determination method is shown according to an embodiment of the present application;

[0020] Figure 5A structural block diagram of a PNA state determination apparatus according to an embodiment of the present application is shown.

[0021] Figure 6 A structural block diagram of another PNA state determination apparatus according to an embodiment of the present application is shown.

[0022] In the above drawings, reference numerals:

[0023] 102, processor; 104, memory; 106, transmission device; 108, input / output device. DETAILED DESCRIPTION

[0024] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0025] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0026] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0027] For the convenience of description, the following describes some nouns or terms related to the embodiments of the present application:

[0028] Molecular sieve: artificially synthesized hydrated silicate or natural zeolite with the function of screening molecules, with the functions of screening molecules, adsorption, ion exchange and catalysis.

[0029] Enthalpy: an important state parameter in thermodynamics to characterize the energy of a material system.

[0030] EE: data storage in ECU, not zero with ECU power on and off.

[0031] Passive NOx Adsorbent (PNA)

[0032] As described in the background section, existing technologies cannot accurately monitor the adsorption and desorption capacity of PNAs, resulting in low NOx emission control capabilities. To address the problem that existing technologies cannot accurately monitor the adsorption and desorption capacity of PNAs, leading to low NOx emission control capabilities, embodiments of this application provide a method for determining the state of PNAs, a device for determining the state of PNAs, a computer-readable storage medium, and an electronic device.

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0034] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a method of determining PNA status according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0035] The memory 104 can be used to store computer programs, such as software programs of application software and modules, such as a computer program corresponding to the method for determining PNA state in the embodiments of the present application. The processor 102 can execute various functions and data processing, i.e., implement the above method, by running the computer program stored in the memory 104. The memory 104 can include a high-speed random access memory, and can further include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory 104 can further include a memory remotely arranged with respect to the processor 102, which can be connected to the mobile terminal through a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data via a network. The specific examples of the above network can include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet in a wireless manner.

[0036] In the embodiments, a method for determining PNA state running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that shown.

[0037] Figure 2 is a flowchart of the method for determining PNA state according to the embodiments of the present application. As shown in Figure 2 , the method includes the following steps:

[0038] In step S201, the water storage change amount of the PNA in a target period is obtained, and the theoretical heat release amount of the PNA in the target period is determined according to the water storage change amount and the molecular sieve structure of the PNA. The PNA has a molecular sieve structure, and is used for adsorbing NOx in exhaust gas. The initial time of the target period is the initial time of the current driving cycle, and the end time of the target period is the time when the change rate of the theoretical heat release amount of the PNA is less than a first threshold value.

[0039] Specifically, one driving cycle usually refers to a period of continuous driving by a driver, usually from the start of driving to the end of driving, and the end time of a driving cycle is usually the time when the engine is turned off. In the case where the rate of change of the theoretical heat release of the PNA is less than the first threshold, it is proved that the adsorption capacity of the PNA is saturated, or the vehicle has stopped generating exhaust gas (the vehicle engine has stopped running), so the time can be determined as the end time of the target period.

[0040] The passive nitrogen oxide adsorbent PNA is an adsorbent for purifying nitrogen oxide pollutants in the air. It can adsorb nitrogen oxides in the air onto its surface through physical and chemical adsorption, thereby purifying the air and reducing pollution to the environment. The passive nitrogen oxide adsorbent PNA is usually used in the fields of industrial exhaust gas purification equipment, automobile exhaust purification device, etc. It has the characteristics of high efficiency, stability, environmental protection, etc., and is a widely used purification technology.

[0041] The use of passive nitrogen oxide adsorbent PNA for purifying automobile exhaust has the following advantages:

[0042] 1. Reducing the emission of nitrogen oxides in exhaust gas: The passive nitrogen oxide adsorbent PNA can effectively adsorb nitrogen oxides in exhaust gas, thereby reducing the emission of nitrogen oxides in automobile exhaust and reducing pollution to the environment.

[0043] 2. Improving the efficiency of exhaust gas purification: PNA can start adsorbing nitrogen oxides in exhaust gas immediately after the start of the vehicle, without waiting for the catalyst to reach the appropriate working temperature, thereby improving the efficiency of exhaust gas purification.

[0044] 3. Extending the service life of the catalyst: After PNA adsorbs part of the nitrogen oxides, it can reduce the corrosion and poisoning effect of nitrogen oxides on the catalyst, thereby extending the service life of the catalyst.

[0045] 4. Reducing costs: The use of PNA can reduce the cost of the automobile exhaust purification system, as it can reduce the need for complex nitrogen oxide catalysts and reduce the dependence on high-temperature catalysts, thereby reducing the energy consumption and maintenance costs of the entire system.

[0046] In the above method, before obtaining the water storage change amount of the PNA in the target period, the method further comprises the following steps:

[0047] Step S301, obtaining a storage average temperature, the storage average temperature being the average temperature of the PNA at the end of the last driving cycle, the average temperature of the PNA being the average temperature of the PNA from the last time the vehicle idled to the time when the vehicle was powered off in the last driving cycle;

[0048] In step S302, the initial water storage amount of the PNA is determined according to the above-mentioned storage average temperature and the above-mentioned water storage model of the PNA, and the water storage model is used to represent the mapping relationship between the temperature and the water stored in the PNA.

[0049] In step S303, the aftertreatment temperature of the vehicle is obtained.

[0050] In step S303, in a case where the initial water storage amount is less than a first preset value, and / or the aftertreatment temperature is less than a second preset value, the water storage change amount of the PNA in a target period is determined.

[0051] Specifically, this can avoid the problem of inaccurate detection caused by the saturation of the initial water storage amount of the PNA and the excessively high vehicle aftertreatment temperature. Since the total water storage amount of a known PNA is constant, if the initial water storage amount is already large, it is considered that the water absorption amount is insufficient, the heat release amount is insufficient, and the judgment is inaccurate. In addition, it can also be detected whether the related measurement sensor is faulty, and in the case where the related measurement sensor is not faulty, the water storage change amount of the PNA in the target period is determined, which can also improve the accuracy of the subsequent steps.

[0052] Among them, the diagnosis mode based on the principle of water absorption and heat release is completed at the beginning of a driving cycle, and the average temperature at the end of the last driving cycle needs to be latched and stored in EE. When the engine is detected to return to idle in the last driving cycle, the average temperature T of the PNA is calculated in a window integration manner. avg The calculation value of the last complete calculation interval before T15 power-off is stored.

[0053] When the vehicle normally powers off to end a driving cycle, the engine should be at idle, so the idle condition is used as an identification feature here, representing the start to calculate the PNA average temperature from the idle start to the idle end (the calculation method of the average temperature can be different according to the actual situation, for example, integrating the average temperature of a step, and dividing the integral value by the integral time).

[0054] During vehicle operation, there are various conditions after idling, for example, it may continue to run, in which case the average temperature will not be stored, or T15 power-off, when T15 power-off is detected (as an identification feature of the end of calculation), the average temperature of this process will be stored, that is, the process from detecting idle to T15 power-off is a complete calculation interval.

[0055] In some embodiments, the average temperature T of the PNA of the last driving cycle can also be directly used to calculate the water storage change amount of the PNA in the target period. avgThe water storage model of the PNA determines the initial water storage of the PNA, and stores the initial water storage of the PNA in the EE, so that the initial water storage of the PNA can be directly read from the EE in the current driving cycle.

[0056] The water storage change of the PNA in the target period is obtained, including the following steps:

[0057] In step S401, the first temperature and the second temperature at each time in the target period are obtained, the first temperature is the average value of the temperature of the exhaust gas before the PNA in the target period, and the second temperature is the average value of the temperature of the exhaust gas after the PNA in the target period.

[0058] In step S402, the water storage model of the PNA is obtained, the water storage model is used to represent the mapping relationship between temperature and water storage in the PNA, and the water storage model is related to temperature, time, water content of the molecular sieve before dehydration, and structure of the molecular sieve.

[0059] In step S403, the average value of the first temperature and the second temperature is determined as the PNA average temperature.

[0060] In step S404, the water storage change of the PNA is determined according to the PNA average temperature and the water storage model.

[0061] Specifically, the water storage change of the PNA (i.e. the amount of water absorbed by the PNA in the target period) can be accurately determined by using the characteristics of water absorption and heat release of the molecular sieve. The water absorption and heat release is a characteristic of the molecular sieve itself, and the water content of the molecular sieve has a similar inverse proportional function relationship with the temperature. The total amount of water that can be stored by a confirmed PNA is constant. The change of the water content of the molecular sieve is calculated based on the change of the PNA average temperature (in some embodiments, it can also be obtained by calibrating the temperature difference). In the low temperature stage, the molecular sieve releases heat by absorbing water from the exhaust gas, and the water is stored in the molecular sieve. After the temperature rises, the absorbed water will be desorbed. The influence of different temperatures, times and water content of the molecular sieve before dehydration on dehydration and water content (including residual water after dehydration) is considered to realize the water storage model of the molecular sieve during the whole absorption and dehydration process. The first temperature and the second temperature are calculated based on the temperature sensors before and after the PNA.

[0062] The theoretical heat release amount of the PNA in the target period is determined according to the water storage change and the structure of the molecular sieve of the PNA, including the following steps:

[0063] In step S501, a water absorption and heat release model is determined according to the structure of the molecular sieve of the PNA, and the water absorption and heat release model represents the mapping relationship between the change of the water amount and the heat release amount.

[0064] Step S502, according to the above water storage change and the above water absorption heat release model, the theoretical heat release amount of the PNA in the target period is determined.

[0065] Specifically, the theoretical heat release amount of the PNA can be accurately determined by using the water absorption heat release characteristics of the molecular sieve. The water absorption heat release model is calculated according to the water amount change. The process is collected by experiment, the coefficient is corrected, and finally the heat release amount of the process is calculated according to the water amount change and temperature and other factors through calibration. (This embodiment only uses the principle of water absorption heat release. The heat release capacity is related to the structure, volume and other factors of the molecular sieve.)

[0066] In some embodiments, it is also necessary to determine the change rate of the theoretical heat release amount. When the change rate of the theoretical heat release amount is greater than or equal to the preset change rate, it is considered that the water absorption heat release capacity of the PNA has approached saturation, which is a termination condition for calculation. When the change rate of the theoretical heat release amount is less than the preset change rate, it is proved that the water absorption heat release capacity of the PNA has not saturated, and the calculation can continue to determine the theoretical heat release amount used for subsequent calculation. The result obtained by calculation will be more accurate.

[0067] Step S202, determining the first heat and the second heat, and determining the actual heat release amount of the PNA in the target period according to at least the first heat and the second heat. The first heat is the heat value of the exhaust gas without passing through the PNA in the target period. The second heat is the heat value of the exhaust gas after passing through the PNA in the target period. The difference between the second heat and the first heat is less than the actual heat release amount.

[0068] Specifically, the calculation of the heat value is according to the formula Q=C 尾气 M 该段时间尾气 △t 该段时间温度变化 , C 尾气 is the concentration of the exhaust gas, M 该段时间尾气 is the mass of the exhaust gas in the target period, △t 该段时间温度变化 is the temperature change in the target period. When calculating the first heat, △t 该段时间温度变化 is the change of the first temperature in the target period. When calculating the second heat, △t 该段时间温度变化 is the change of the second temperature in the target period.

[0069] In some embodiments, the calculation of heat can also be realized by enthalpy value, that is, the enthalpy value corresponding to each time in the target period is obtained, and then the enthalpy value is integrated in the target period to obtain the heat corresponding to the target period.

[0070] wherein the first heat is obtained according to an inlet temperature of the PNA, the second heat is obtained according to an outlet temperature of the PNA, the actual heat release of the PNA in the target period is determined according to at least the first heat and the second heat, and the method comprises the following steps:

[0071] In step S2021, the heat consumption of the PNA carrier is obtained, wherein the heat consumption of the PNA carrier is the heat consumption required when the PNA itself is adsorbed;

[0072] In step S2022, the heat transfer loss is obtained, wherein the heat transfer loss is the heat loss generated in the heat transfer process;

[0073] In step S2023, the actual heat release of the PNA in the target period is determined according to the heat formula Q e = Q PNA后 + Q PNA载体 + Q 传热损失 - Q PNA前 , wherein Q e is the actual heat release of the PNA in the target period, Q PNA后 is the second heat, Q PNA载体 is the heat consumption of the PNA carrier, Q 传热损失 is the heat transfer loss, and Q PNA前 is the first heat.

[0074] Specifically, the actual heat release of the PNA can be accurately calculated, and the performance of the PNA can be accurately judged according to the size of the actual heat release and the theoretical heat release by using the water absorption and heat release characteristics of the molecular sieve. The diagnosis without NOx can exclude the problem of inaccurate diagnosis caused by some reasons affecting NOx, and does not need active diagnosis, and can meet the condition of diagnosing at any time in each driving cycle.

[0075] In step S203, the size of the theoretical heat release and the actual heat release is compared, and in the case that the actual heat release is less than the theoretical heat release, it is determined that the PNA is in a degraded state, and in the case that the PNA is in a degraded state, the NOx adsorption amount in the unit volume of the PNA is less than the preset adsorption amount.

[0076] Specifically, the PNA is a molecular sieve structure, and the aging or failure of the molecular sieve directly affects the NOx adsorption and desorption capacity of the PNA. The performance of the PNA is diagnosed by using the water absorption and heat release characteristics of the molecular sieve itself. The diagnosis without NOx can exclude the problem of inaccurate diagnosis caused by some reasons affecting NOx, and does not need active diagnosis, and can meet the condition of diagnosing at any time in each driving cycle. That is, in the case that the actual heat release is less than the theoretical heat release, it is determined that the adsorption performance of the PNA is less than the theoretical adsorption performance, and therefore it is determined that the PNA is in a degraded state.

[0077] wherein, as shown in Figure 3 the actual heat release is less than the theoretical heat release, the PNA is determined to be in a degraded state, comprising the following steps:

[0078] Step S2031, obtaining environmental conditions, the environmental conditions at least comprising: ambient temperature, degradation coefficient, intake temperature of the engine, intake humidity of the engine, the ambient temperature being the temperature of the environment where the vehicle is located, the degradation coefficient representing the degradation degree of the PNA at the current time, the degradation coefficient being related to time;

[0079] Step S2032, determining a correction coefficient according to the environmental conditions, and determining the product of the theoretical heat release and the correction coefficient as a heat release threshold;

[0080] Step S2033, comparing the actual heat release with the heat release threshold, and in the case that the actual heat release is greater than or equal to the heat release threshold, determining that the PNA is in a non-degraded state, and in the case that the actual heat release is less than the heat release threshold, determining that the PNA is in a degraded state.

[0081] Specifically, the performance of the PNA molecular sieve is diagnosed by using the characteristics of water absorption and heat release of the PNA molecular sieve itself. Diagnosing in a way without NOx can exclude the problem of inaccurate diagnosis caused by some reasons affecting NOx, and does not need active diagnosis, meets the condition that the PNA can be diagnosed at any time in each driving cycle, and based on the diagnosis result, attempts to restore the PNA capability, solves the problem that the existing technology cannot accurately monitor the adsorption and desorption capability of the PNA, resulting in low capability of NOx emission control. In the case that the actual heat release is greater than or equal to the heat release threshold, it is proved that the adsorption performance of the PNA can meet the theoretical requirements, that is, the PNA performance is good, and the PNA is determined to be in a non-degraded state. In the case that the actual heat release is less than the heat release threshold, it is proved that the adsorption performance of the PNA cannot meet the theoretical requirements, that is, the PNA performance is degraded, and the PNA is determined to be in a degraded state.

[0082] wherein, after determining that the PNA is in a degraded state, the method further comprises the following steps:

[0083] Step S501, determining the working state of the PNA in a plurality of driving cycles, the working state comprising a degraded state and a non-degraded state;

[0084] Step S502, in the case that the working state of the PNA is the deterioration state in the two continuous driving cycles, triggering a regeneration attempt function, the regeneration attempt function is a function of attempting to restore the working state of the PNA from the deterioration state to the non-deterioration state.

[0085] Specifically, in the case that the working state of the PNA is the deterioration state in the two continuous driving cycles, triggering a regeneration attempt function, the regeneration attempt function is a function of attempting to restore the working state of the PNA from the deterioration state to the non-deterioration state.

[0086] The PNA state determination method of the present application first obtains the water storage change amount of the PNA in the target period, and determines the theoretical heat release amount of the PNA in the target period according to the water storage change amount and the molecular sieve structure of the PNA. The PNA is a molecular sieve structure, and the PNA is used for adsorbing NOx in exhaust gas. The initial time of the target period is the initial time of the current driving cycle, and the end time of the target period is the time when the change rate of the theoretical heat release amount of the PNA is less than a first threshold value. Then, the first heat and the second heat are determined, and the actual heat release amount of the PNA in the target period is determined according to at least the first heat and the second heat. The first heat is the heat value of the exhaust gas that has not passed through the PNA in the target period, and the second heat is the heat value of the exhaust gas that has passed through the PNA in the target period. The difference between the second heat and the first heat is less than the actual heat release amount. Finally, the theoretical heat release amount and the actual heat release amount are compared. In the case that the actual heat release amount is less than the theoretical heat release amount, it is determined that the PNA is in a deterioration state. In the case that the PNA is in a deterioration state, the NOx adsorption amount per unit volume of the PNA is less than a preset adsorption amount. This method fully utilizes the water absorption and heat release characteristics of the PNA molecular sieve to diagnose its performance. Diagnosing without NOx can eliminate the problem of inaccurate diagnosis caused by factors affecting NOx, and does not require active diagnosis. The conditions can be diagnosed at any time in each driving cycle, and the PNA capacity is attempted to be restored based on the diagnosis result, solving the problem that the existing technology cannot accurately monitor the adsorption and desorption capacity of the PNA, resulting in low NOx emission control capacity.

[0087] In order for those skilled in the art to more clearly understand the technical solutions of the present application, the implementation process of the PNA state determination method of the present application will be described in detail below in conjunction with specific embodiments.

[0088] The present embodiment relates to a specific PNA state determination method, as shown in Figure 4 The method comprises the following steps:

[0089] Step S1: With the engine running, determine the start of a new driving cycle and read the average PNA temperature T stored before the power was off in the previous driving cycle. avg Based on the average temperature T of the PNA stored before the last driving cycle before power-off. avg Determine the initial water storage volume of the PNA. Based on the initial water storage volume of the PNA, determine whether the system meets the diagnostic conditions. If the initial water storage volume of the PNA is greater than or equal to the preset value, it is determined that the diagnostic conditions are not met and the diagnosis ends. If the initial water storage volume of the PNA is less than the preset value, it is determined that the diagnostic conditions are met and the subsequent steps continue.

[0090] Step S2: Calculate the theoretical heat release Q based on the first and second temperatures. i Calculate the enthalpy of the exhaust gas before and after passing through the PNA, and calculate the actual heat release Q based on the enthalpy of the exhaust gas before and after passing through the PNA and the exhaust flow rate. e ;

[0091] Step S3: Determine Q i Is the rate of change less than the threshold in Q? i If the rate of change is greater than or equal to the threshold, feedback step S2 is initiated, in Q. i When the rate of change is less than the threshold, output Q. i and Q e Determine whether Q is satisfied. e <Q i If ×fac is not met, then PNA is determined to be in a normal state, and the PNA of this driving cycle is stored in EE as a normal state. If it is met, then a deterioration state is recorded.

[0092] Step S4: Determine whether the PNA is in a degraded state for two consecutive driving cycles. If so, perform a regeneration attempt to restore performance and end the diagnosis. If not, store the degraded state of the driving cycle PNA in the EE and end the diagnosis.

[0093] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0094] The embodiment of the present application further provides a PNA state determination device. It should be noted that the PNA state determination device of the embodiment of the present application can be used to execute the PNA state determination method provided by the embodiment of the present application. The device is used to realize the above-mentioned embodiment and preferred embodiment, and the description has been made. As used below, the term "module" can be a combination of software and / or hardware that realizes a predetermined function. Although the device described in the following embodiment is preferably realized in software, the realization of hardware, or the combination of software and hardware, is also possible and conceived.

[0095] The PNA state determination device provided by the embodiment of the present application is described below.

[0096] Figure 5 is a schematic diagram of the PNA state determination device according to the embodiment of the present application. As shown in Figure 5 , the device comprises an acquisition unit 10, a first determination unit 20 and a second determination unit 30. The acquisition unit 10 is configured to acquire a water storage change amount of a PNA in a target period, and determine a theoretical heat release amount of the PNA in the target period according to the water storage change amount and a molecular sieve structure of the PNA. The PNA is a molecular sieve structure, the PNA is used to adsorb NOx in exhaust gas, the initial time of the target period is the initial time of the current driving cycle, and the end time of the target period is the time when the change rate of the theoretical heat release amount of the PNA is less than a first threshold value. The first determination unit 20 is configured to determine a first heat and a second heat, and determine an actual heat release amount of the PNA in the target period according to at least the first heat and the second heat. The first heat is a heat value when the exhaust gas in the target period does not pass through the PNA, the second heat is a heat value after the exhaust gas in the target period passes through the PNA, and the difference between the second heat and the first heat is less than the actual heat release amount. The second determination unit 30 is configured to compare the theoretical heat release amount and the actual heat release amount. In the case that the actual heat release amount is less than the theoretical heat release amount, it is determined that the PNA is in a degraded state. In the case that the PNA is in the degraded state, the NOx adsorption amount in a unit volume of the PNA is less than a preset adsorption amount.

[0097] The device for determining the state of the PNA described in this application includes an acquisition unit, a first determination unit, and a second determination unit. The acquisition unit is used to acquire the change in water storage of the PNA within a target time period, and to determine the theoretical heat release of the PNA within the target time period based on the change in water storage and the molecular sieve structure of the PNA. The PNA has a molecular sieve structure and is used to adsorb NOx in exhaust gas. The initial time of the target time period is the initial time of the current driving cycle, and the end time of the target time period is the time when the rate of change of the theoretical heat release of the PNA is less than a first threshold. The first determination unit is used to determine a first heat and a second heat, and to determine the actual heat release of the PNA within the target time period based at least on the first heat and the second heat. The first heat is the heat value of the exhaust gas before it passes through the PNA within the target time period, and the second heat is the heat value of the exhaust gas after it passes through the PNA within the target time period. The difference between the second heat and the first heat is less than the actual heat release. The second determination unit is used to compare the theoretical heat release with the actual heat release. If the actual heat release is less than the theoretical heat release, the PNA is determined to be in a deteriorated state. If the PNA is in a deteriorated state, the amount of NOx adsorbed per unit volume of the PNA is less than a preset adsorption amount. This device fully utilizes the water absorption and heat release properties of PNA molecular sieves to diagnose their performance. Diagnosing without addressing NOx emissions eliminates potential inaccuracies caused by factors affecting NOx levels. Furthermore, it eliminates the need for active diagnostics; under certain conditions, it can perform real-time diagnostics during each driving cycle and attempt to restore PNA capabilities based on the results. This addresses the problem of existing technologies' inability to accurately monitor PNA adsorption and desorption capabilities, leading to lower NOx emission control.

[0098] In some optional instances, such as Figure 6 As shown, the acquisition unit includes a first acquisition module 11, a second acquisition module 12, a first determination module 13, and a second determination module 14. The first acquisition module is used to acquire a first temperature and a second temperature at each time point within the target time period. The first temperature is the average temperature of the exhaust gas before passing through the PNA within the target time period, and the second temperature is the average temperature of the exhaust gas after passing through the PNA within the target time period. The second acquisition module is used to acquire a water storage model of the PNA. The water storage model is used to characterize the mapping relationship between temperature and water stored in the PNA. The water storage model is related to temperature, time, water content of the molecular sieve before dehydration, and the structure of the molecular sieve. The first determination module is used to determine the average of the first temperature and the second temperature as the average temperature of the PNA. The second determination module is used to determine the change in water storage of the PNA based on the average temperature of the PNA and the water storage model. The change in water storage of the PNA (i.e., the amount of water absorbed by the PNA within the target time period) can be accurately determined by utilizing the water absorption and heat release characteristics of the molecular sieve itself.

[0099] Exemplarily, the acquisition unit comprises a third determination module and a fourth determination module, the third determination module is configured to determine a water absorption and heat release model according to the molecular sieve structure of the PNA, the water absorption and heat release model represents a mapping relationship between water quantity change and heat release quantity; and the fourth determination module is configured to determine a theoretical heat release quantity of the PNA in the target period according to the water storage change quantity and the water absorption and heat release model.

[0100] In some optional examples, the first heat quantity is obtained according to an inlet temperature of the PNA, the second heat quantity is obtained according to an outlet temperature of the PNA, the first determination unit comprises a second acquisition module, a third acquisition module and a fifth determination module, the second acquisition module is configured to acquire a PNA carrier heat consumption, the PNA carrier heat consumption is a heat consumption required when the PNA itself performs adsorption; the third acquisition module is configured to acquire a heat transfer loss, the heat transfer loss is a heat loss generated in a heat transfer process; and the fifth determination module is configured to determine an actual heat release quantity of the PNA in the target period according to a heat formula Q e = Q PNA后 + Q PNA载体 + Q 传热损失 - Q PNA前 , Q e is the actual heat release quantity of the PNA in the target period, Q PNA后 is the second heat quantity, Q PNA载体 is the PNA carrier heat consumption, Q 传热损失 is the heat transfer loss, and Q PNA前 is the first heat quantity. In this way, the actual heat release quantity of the PNA can be accurately calculated, and according to the size of the actual heat release quantity and the theoretical heat release quantity, the performance of the PNA can be accurately judged by using the water absorption and heat release characteristics of the molecular sieve itself.

[0101] In the embodiment, the second determination unit comprises a fourth acquisition module, a sixth determination module and a comparison module, the fourth acquisition module is configured to acquire environmental conditions, the environmental conditions at least comprise an environmental temperature, a deterioration coefficient, an intake temperature of an engine, an intake humidity of the engine, the environmental temperature is a temperature of an environment where the vehicle is located, the deterioration coefficient represents a deterioration degree of the PNA at a current time, and the deterioration coefficient is related to time; the sixth determination module is configured to determine a correction coefficient according to the environmental conditions, and determine a product of the theoretical heat release quantity and the correction coefficient as a heat release quantity threshold; and the comparison module is configured to compare the size of the actual heat release quantity and the heat release quantity threshold, and in a case where the actual heat release quantity is greater than or equal to the heat release quantity threshold, determine that the PNA is in a non-deterioration state, and in a case where the actual heat release quantity is less than the heat release quantity threshold, determine that the PNA is in a deterioration state. The performance of the PNA is diagnosed by using the water absorption and heat release characteristics of the molecular sieve itself.

[0102] In an optional solution, the device further comprises a fifth acquisition module, a seventh determination module, a sixth acquisition module and an eighth determination module. The fifth acquisition module is configured to acquire a storage average temperature before acquiring the water storage change amount of the PNA in the target period. The storage average temperature is an average temperature of the PNA stored at the end of the last driving cycle. The average temperature of the PNA is an average temperature of the PNA from the last time the vehicle idled to the time when the vehicle was powered off in the last driving cycle. The seventh determination module is configured to determine the initial water storage amount of the PNA according to the storage average temperature and a water storage model of the PNA. The water storage model is used to represent the mapping relationship between temperature and water stored in the PNA. The sixth acquisition module is configured to acquire the aftertreatment temperature of the vehicle. The eighth determination module is configured to determine the water storage change amount of the PNA in the target period when the initial water storage amount is less than a first preset value and / or the aftertreatment temperature is less than a second preset value. In this way, the problem of inaccurate detection caused by saturated initial water storage amount of the PNA and excessively high aftertreatment temperature of the vehicle can be avoided.

[0103] As an optional solution, the device further comprises a ninth determination module and a regeneration module. The ninth determination module is configured to determine the working state of the PNA in a plurality of driving cycles after determining that the PNA is in the degraded state. The working state includes the degraded state and the non-degraded state. The regeneration module is configured to trigger a regeneration attempt function once when the working state of the PNA in two consecutive driving cycles is the degraded state. The regeneration attempt function is a function of attempting to restore the working state of the PNA from the degraded state to the non-degraded state. When the working state of the PNA in two consecutive driving cycles is the degraded state, triggering the regeneration attempt function once can ensure the regeneration effect on the basis of attempting to regenerate the PNA, save system resources, and avoid unnecessary resource waste caused by triggering the regeneration attempt function in each driving cycle.

[0104] The PNA state determination device comprises a processor and a memory. The acquisition unit and the like are stored in the memory as program units. The corresponding functions are realized by the processor executing the program units stored in the memory. The modules are located in the same processor. Alternatively, the modules are located in different processors in any combination.

[0105] The processor comprises a core. The core retrieves the corresponding program unit from the memory. The core can be set to one or more. By adjusting the core parameters, the problem that the adsorption and desorption capacity of the PNA cannot be accurately monitored in the prior art, resulting in low control ability of NOx emission, can be solved.

[0106] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0107] This invention provides a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the method for determining the PNA state.

[0108] Specifically, the methods for determining the PNA status include:

[0109] Step S201: Obtain the change in water storage of PNA within the target time period, and determine the theoretical heat release of PNA within the target time period based on the change in water storage and the molecular sieve structure of PNA. PNA has a molecular sieve structure and is used to adsorb NOx in exhaust gas. The initial time of the target time period is the initial time of the current driving cycle, and the end time of the target time period is the time when the rate of change of the theoretical heat release of PNA is less than a first threshold.

[0110] Specifically, a driving cycle typically refers to a period of continuous driving by a driver, usually from the start to the end of driving. The end of a driving cycle is generally the moment the engine is turned off. When the rate of change of the theoretical heat release of the PNA is less than the first threshold, it proves that the adsorption capacity of the PNA is saturated, or that the vehicle no longer produces exhaust emissions (the vehicle engine stops running). Therefore, this moment can be determined as the end of the target period.

[0111] Step S202: Determine the first heat and the second heat, and determine the actual heat release of the PNA in the target time period based at least on the first heat and the second heat. The first heat is the heat value of the exhaust gas before passing through the PNA in the target time period, and the second heat is the heat value of the exhaust gas after passing through the PNA in the target time period. The difference between the second heat and the first heat is less than the actual heat release.

[0112] Specifically, the caloric value is calculated using the formula Q = C. 尾气 M 该段时间尾气 △t 该段时间温度变化 C 尾气 M represents the concentration of exhaust gases. 该段时间尾气 The mass of exhaust gas emitted during the target time period, Δt 该段时间温度变化 To calculate the temperature change during the target time period, Δt is used when calculating the first heat. 该段时间温度变化 For the change in the first temperature during the target time period, when calculating the second heat, Δt该段时间温度变化 a change in the second temperature over a target period.

[0113] In step S203, the actual heat release amount is compared with the theoretical heat release amount. If the actual heat release amount is less than the theoretical heat release amount, it is determined that the PNA is in a degraded state. If the PNA is in a degraded state, the amount of NOx adsorbed per unit volume of the PNA is less than a preset adsorption amount.

[0114] Specifically, the PNA is a molecular sieve structure, and aging or failure of the molecular sieve directly affects the NOx adsorption / desorption capacity of the PNA. The performance of the molecular sieve is diagnosed by using the water absorption and heat release characteristics of the molecular sieve itself. Diagnosing in a manner that does not use NOx can eliminate the problem of inaccurate diagnosis caused by factors affecting NOx, and active diagnosis is not required, so that diagnosis can be performed at any time during each driving cycle. That is, if the actual heat release amount is less than the theoretical heat release amount, it is determined that the adsorption performance of the PNA is less than the theoretical adsorption performance, and thus it is determined that the PNA is in a degraded state.

[0115] Optionally, the water storage change amount of the PNA in the target period is obtained by obtaining the first temperature and the second temperature at each time point in the target period, the first temperature being an average of the temperature of the exhaust gas before passing through the PNA in the target period, and the second temperature being an average of the temperature of the exhaust gas after passing through the PNA in the target period; obtaining a water storage model of the PNA, the water storage model being used to represent a mapping relationship between temperature and water stored in the PNA, the water storage model being related to temperature, time, water content of the molecular sieve before dehydration, and structure of the molecular sieve; determining the average of the first temperature and the second temperature as a PNA average temperature; and determining the water storage change amount of the PNA according to the PNA average temperature and the water storage model.

[0116] Optionally, the theoretical heat release amount of the PNA in the target period is determined according to the water storage change amount and the molecular sieve structure of the PNA, by determining a water absorption and heat release model according to the molecular sieve structure of the PNA, the water absorption and heat release model representing a mapping relationship between water amount change and heat release amount; and determining the theoretical heat release amount of the PNA in the target period according to the water storage change amount and the water absorption and heat release model.

[0117] Optionally, the first heat is obtained according to an inlet temperature of the PNA, the second heat is obtained according to an outlet temperature of the PNA, and determining the actual heat release of the PNA in the target period according to at least the first heat and the second heat comprises: obtaining a PNA carrier heat consumption, the PNA carrier heat consumption being a heat consumption required when the PNA itself is adsorbed; obtaining a heat transfer loss, the heat transfer loss being a heat loss generated in a heat transfer process; determining the actual heat release of the PNA in the target period according to a heat formula Q e = Q PNA后 + Q PNA载体 + Q 传热损失 - Q PNA前 , Q e being the actual heat release of the PNA in the target period, Q PNA后 being the second heat, Q PNA载体 being the PNA carrier heat consumption, Q 传热损失 being the heat transfer loss, and Q PNA前 being the first heat.

[0118] Optionally, the actual heat release is compared with the theoretical heat release, and in a case where the actual heat release is less than the theoretical heat release, the PNA is determined to be in a degradation state, which comprises: obtaining environmental conditions, the environmental conditions at least comprising: an environmental temperature, a degradation coefficient, an intake temperature of an engine, and an intake humidity of the engine, the environmental temperature being a temperature of an environment in which a vehicle is located, the degradation coefficient representing a degradation degree of the PNA at a current time, and the degradation coefficient being related to time; determining a correction coefficient according to the environmental conditions, and determining a heat release threshold value as a product of the theoretical heat release and the correction coefficient; comparing the actual heat release with the heat release threshold value, and in a case where the actual heat release is greater than or equal to the heat release threshold value, determining that the PNA is in a non-degradation state, and in a case where the actual heat release is less than the heat release threshold value, determining that the PNA is in a degradation state.

[0119] Optionally, before obtaining the water storage change amount of the PNA in the target period, the method further comprises: obtaining a storage average temperature, the storage average temperature being an average temperature of the PNA stored at the end of the last driving cycle, the average temperature of the PNA being an average temperature of the PNA from the last time the vehicle idled to the time when the vehicle was powered off in the last driving cycle; determining an initial water storage amount of the PNA according to the storage average temperature and a water storage model of the PNA, the water storage model being used to represent a mapping relationship between temperature and water stored in the PNA; obtaining a post-processing temperature of the vehicle; and determining the water storage change amount of the PNA in the target period in a case where the initial water storage amount is less than a first preset value and / or the post-processing temperature is less than a second preset value.

[0120] Optionally, after determining that the PNA is in the degraded state, the method further comprises: determining a working state of the PNA in a plurality of driving cycles, the working state including the degraded state and a non-degraded state; and triggering a regeneration attempt function in a case where the working state of the PNA in two consecutive driving cycles is the degraded state, the regeneration attempt function being a function of attempting to restore the working state of the PNA from the degraded state to the non-degraded state.

[0121] Embodiments of the present application provide a processor, which is used to run a program, wherein the processor is used to execute the method for determining the PNA state when the program is running.

[0122] Specifically, the method for determining the PNA state comprises:

[0123] In step S201, a water storage change amount of the PNA in a target period is obtained, and a theoretical heat release amount of the PNA in the target period is determined according to the water storage change amount and a molecular sieve structure of the PNA, the PNA being a molecular sieve structure, the PNA being used to adsorb NOx in exhaust gas, an initial time of the target period being an initial time of a current driving cycle, and an end time of the target period being a time when a change rate of the theoretical heat release amount of the PNA is less than a first threshold value.

[0124] Specifically, one driving cycle usually refers to a time period of continuous driving by a driver, and is usually a time period from starting driving to ending driving. The end time of one driving cycle is generally the time when the engine is turned off. In a case where the change rate of the theoretical heat release amount of the PNA is less than the first threshold value, it is proved that the adsorption capacity of the PNA is saturated, or the vehicle no longer generates exhaust gas (the vehicle engine stops running), and therefore, the time can be determined as the end time of the target period.

[0125] Step S202, determining a first heat and a second heat, and determining an actual heat release of the PNA in the target period according to at least the first heat and the second heat, the first heat being a heat value of the exhaust gas without passing through the PNA in the target period, the second heat being a heat value of the exhaust gas passing through the PNA in the target period, and a difference between the second heat and the first heat being less than the actual heat release;

[0126] Specifically, the calculation of the heat value is according to the formula Q=C 尾气 M 该段时间尾气 △t 该段时间温度变化 , C 尾气 is the concentration of the exhaust gas, M 该段时间尾气 is the mass of the exhaust gas in the target period, and△t 该段时间温度变化 is the change of temperature in the target period,△t 该段时间温度变化 is the change of the first temperature in the target period when calculating the first heat, and△t 该段时间温度变化 is the change of the second temperature in the target period when calculating the second heat.

[0127] Step S203, comparing the actual heat release with the theoretical heat release, and determining that the PNA is in a degraded state when the actual heat release is less than the theoretical heat release, and the adsorption amount of NOx in the unit volume of the PNA is less than a preset adsorption amount when the PNA is in the degraded state.

[0128] Specifically, the PNA is a molecular sieve structure, and the aging or failure of the molecular sieve directly affects the NOx adsorption / desorption capacity of the PNA. The performance of the molecular sieve is diagnosed by using the characteristics of water absorption and heat release of the molecular sieve itself. Diagnosing in the manner without NOx can exclude the problem of inaccurate diagnosis caused by some factors affecting NOx, and active diagnosis is not required, and the condition can be diagnosed at any time in each driving cycle. That is, when the actual heat release is less than the theoretical heat release, it is determined that the adsorption performance of the PNA is less than the theoretical adsorption performance, and thus it is determined that the PNA is in the degraded state.

[0129] The embodiment of the present application provides a device, which comprises a processor, a memory, and a program stored in the memory and executable on the processor, and the processor implements at least the following steps when executing the program:

[0130] Step S201, obtaining a water storage change amount of the PNA in a target period, and determining a theoretical heat release amount of the PNA in the target period according to the water storage change amount and a molecular sieve structure of the PNA, the PNA being a molecular sieve structure, the PNA being used for adsorbing NOx in exhaust emission, an initial time of the target period being an initial time of a current driving cycle, and an end time of the target period being a time when a change rate of the theoretical heat release amount of the PNA is less than a first threshold value;

[0131] Step S202, determining a first heat and a second heat, and determining an actual heat release amount of the PNA in the target period according to at least the first heat and the second heat, the first heat being a heat value when the exhaust emission in the target period does not pass through the PNA, the second heat being a heat value when the exhaust emission in the target period passes through the PNA, and a difference between the second heat and the first heat being less than the actual heat release amount;

[0132] Step S203, comparing the theoretical heat release amount and the actual heat release amount, and determining that the PNA is in a degraded state when the actual heat release amount is less than the theoretical heat release amount, and the NOx adsorption amount per unit volume of the PNA being less than a preset adsorption amount when the PNA is in the degraded state.

[0133] The device herein can be a server, a PC, a PAD, a mobile phone, etc.

[0134] Optionally, the water storage change amount of the PNA in the target period is obtained by: obtaining a first temperature and a second temperature at each time in the target period, the first temperature being an average value of the temperature of the exhaust emission before passing through the PNA in the target period, and the second temperature being an average value of the temperature of the exhaust emission after passing through the PNA in the target period; obtaining a water storage model of the PNA, the water storage model being used to represent a mapping relationship between the temperature and the water stored in the PNA, the water storage model being related to the temperature, the time, the water content of the molecular sieve before dehydration, and the structure of the molecular sieve; determining the PNA average temperature as the average value of the first temperature and the second temperature; and determining the water storage change amount of the PNA according to the PNA average temperature and the water storage model.

[0135] Optionally, the theoretical heat release amount of the PNA in the target period is determined according to the water storage change amount and the molecular sieve structure of the PNA by: determining a water absorption and heat release model according to the molecular sieve structure of the PNA, the water absorption and heat release model representing a mapping relationship between the water amount change and the heat release amount; and determining the theoretical heat release amount of the PNA in the target period according to the water storage change amount and the water absorption and heat release model.

[0136] Optionally, the first heat is obtained according to an inlet temperature of the PNA, the second heat is obtained according to an outlet temperature of the PNA, and determining the actual heat release of the PNA in the target period according to at least the first heat and the second heat comprises: obtaining a PNA carrier heat consumption, the PNA carrier heat consumption being a heat consumption required when the PNA itself is adsorbed; obtaining a heat transfer loss, the heat transfer loss being a heat loss generated in a heat transfer process; determining the actual heat release of the PNA in the target period according to a heat formula Q e = Q PNA后 + Q PNA载体 + Q 传热损失 - Q PNA前 , Q e being the actual heat release of the PNA in the target period, Q PNA后 being the second heat, Q PNA载体 being the PNA carrier heat consumption, Q 传热损失 being the heat transfer loss, and Q PNA前 being the first heat.

[0137] Optionally, the actual heat release is compared with the theoretical heat release, and in a case where the actual heat release is less than the theoretical heat release, the PNA is determined to be in a degradation state, which comprises: obtaining environmental conditions, the environmental conditions at least comprising: an environmental temperature, a degradation coefficient, an intake temperature of an engine, and an intake humidity of the engine, the environmental temperature being a temperature of an environment in which a vehicle is located, the degradation coefficient representing a degradation degree of the PNA at a current time, and the degradation coefficient being related to time; determining a correction coefficient according to the environmental conditions, and determining a heat release threshold value as a product of the theoretical heat release and the correction coefficient; comparing the actual heat release with the heat release threshold value, and in a case where the actual heat release is greater than or equal to the heat release threshold value, determining that the PNA is in a non-degradation state, and in a case where the actual heat release is less than the heat release threshold value, determining that the PNA is in a degradation state.

[0138] Optionally, before the water storage change amount of the PNA in the target period is obtained, the method further comprises: obtaining a storage average temperature, the storage average temperature being an average temperature of the PNA stored at the end of the last driving cycle, the average temperature of the PNA being an average temperature of the PNA from the last time the vehicle idled to the time when the vehicle was powered off in the last driving cycle; determining an initial water storage amount of the PNA according to the storage average temperature and a water storage model of the PNA, the water storage model being used to represent a mapping relationship between temperature and water stored in the PNA; obtaining a post-processing temperature of the vehicle; and determining the water storage change amount of the PNA in the target period in a case where the initial water storage amount is less than a first preset value and / or the post-processing temperature is less than a second preset value.

[0139] Optionally, after it is determined that the PNA is in the degraded state, the method further comprises: determining a working state of the PNA in a plurality of driving cycles, the working state including the degraded state and a non-degraded state; and triggering a regeneration attempt function in a case where the working state of the PNA in two consecutive driving cycles is the degraded state, the regeneration attempt function being a function of attempting to restore the working state of the PNA from the degraded state to the non-degraded state.

[0140] The application also provides a computer program product adapted to execute a program that initializes at least the following method steps when executed on a data processing device:

[0141] Step S201, obtaining a water storage change amount of the PNA in a target period, and determining a theoretical heat release amount of the PNA in the target period according to the water storage change amount and a molecular sieve structure of the PNA, the PNA being a molecular sieve structure, the PNA being used to adsorb NOx in exhaust gas, an initial time of the target period being an initial time of a current driving cycle, and an end time of the target period being a time when a change rate of the theoretical heat release amount of the PNA is less than a first threshold value;

[0142] Step S202, determining a first heat and a second heat, and determining an actual heat release amount of the PNA in the target period according to at least the first heat and the second heat, the first heat being a heat value of the exhaust gas without passing through the PNA in the target period, the second heat being a heat value of the exhaust gas after passing through the PNA in the target period, and a difference between the second heat and the first heat being less than the actual heat release amount;

[0143] Step S203, comparing the theoretical heat release amount with the actual heat release amount, in the case of the actual heat release amount being less than the theoretical heat release amount, determining that the PNA is in a degraded state, in the case of the PNA being in a degraded state, the NOx adsorption amount in the unit volume of the PNA is less than the preset adsorption amount.

[0144] Optionally, the water storage change amount of the PNA in the target period is obtained, including: obtaining the first temperature and the second temperature at each time in the target period, the first temperature being the average value of the temperature of the exhaust gas before the PNA in the target period, and the second temperature being the average value of the temperature of the exhaust gas after the PNA in the target period; obtaining a water storage model of the PNA, the water storage model being used to represent the mapping relationship between temperature and water storage in the PNA, the water storage model being related to temperature, time, water content of the molecular sieve before dehydration, and structure of the molecular sieve; determining the average value of the first temperature and the second temperature as the PNA average temperature; determining the water storage change amount of the PNA according to the PNA average temperature and the water storage model.

[0145] Optionally, the theoretical heat release amount of the PNA in the target period is determined according to the water storage change amount and the molecular sieve structure of the PNA, including: determining a water absorption heat release model according to the molecular sieve structure of the PNA, the water absorption heat release model representing the mapping relationship between water amount change and heat release amount; determining the theoretical heat release amount of the PNA in the target period according to the water storage change amount and the water absorption heat release model.

[0146] Optionally, the first heat is obtained according to the inlet temperature of the PNA, and the second heat is obtained according to the outlet temperature of the PNA, and the actual heat release amount of the PNA in the target period is determined according to at least the first heat and the second heat, including: obtaining a PNA carrier heat consumption, the PNA carrier heat consumption being the heat consumption required when the PNA itself is adsorbed; obtaining a heat transfer loss, the heat transfer loss being the heat loss generated in the heat transfer process; determining the actual heat release amount of the PNA in the target period according to the heat formula Q e = Q PNA后 + Q PNA载体 + Q 传热损失 - Q PNA前 , Q e being the actual heat release amount of the PNA in the target period, Q PNA后 being the second heat, Q PNA载体 being the PNA carrier heat consumption, Q 传热损失 being the heat transfer loss, and Q PNA前 being the first heat.

[0147] Optionally, the method further comprises: obtaining an ambient condition, the ambient condition comprising at least one of: an ambient temperature, a degradation coefficient, an intake temperature of the engine, an intake humidity of the engine, the ambient temperature being a temperature of an environment in which the vehicle is located, the degradation coefficient representing a degradation degree of the PNA at a current time, the degradation coefficient being related to time; determining a correction coefficient according to the ambient condition, and determining a heat release threshold value as a product of the theoretical heat release and the correction coefficient; comparing the actual heat release with the heat release threshold value, and determining that the PNA is in the non-degradation state when the actual heat release is greater than or equal to the heat release threshold value, or determining that the PNA is in the degradation state when the actual heat release is less than the heat release threshold value.

[0148] Optionally, before the obtaining the water storage change amount of the PNA in the target period, the method further comprises: obtaining a storage average temperature, the storage average temperature being an average temperature of the PNA stored at an end of a previous driving cycle, the average temperature of the PNA being an average temperature of the PNA from a last time of idling of the vehicle to a power-off time of the vehicle in the previous driving cycle; determining an initial water storage amount of the PNA according to the storage average temperature and a water storage model of the PNA, the water storage model being used to represent a mapping relationship between temperature and water stored in the PNA; obtaining an aftertreatment temperature of the vehicle; and determining the water storage change amount of the PNA in the target period when the initial water storage amount is less than a first preset value and / or the aftertreatment temperature is less than a second preset value.

[0149] Optionally, after the determining that the PNA is in the degradation state, the method further comprises: determining a working state of the PNA in a plurality of driving cycles, the working state comprising the degradation state and a non-degradation state; and triggering a regeneration attempt function when the working state of the PNA in two consecutive driving cycles is the degradation state, the regeneration attempt function being a function of attempting to restore the working state of the PNA from the degradation state to the non-degradation state.

[0150] It should be apparent to those skilled in the art that the modules or steps of the application described above can be implemented with a general purpose computer, and can be centralized in a single computer or distributed among a network of computers, and can be implemented with program code executable by a computer, and thus can be stored in a storage device and executed by a computer, and in some cases, the steps shown or described can be executed in a different order than shown or described, or can be implemented as separate integrated circuit modules or as a single integrated circuit module, and thus the application is not limited to any particular combination of hardware and software.

[0151] Those skilled in the art will appreciate that embodiments of the application can be devised for a method, a system, or a computer program product. Accordingly, the application can be embodied in the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the application can be in the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk memory, CD-ROMs, optical storage media, etc.) embodying computer readable program code.

[0152] The present application is described in reference to the flowchart illustrations and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0153] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0154] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart illustrations and / or block diagrams.Figure 1 one or more processes and / or functions specified in one or more blocks Figure 1 one or more processes and / or functions specified in one or more blocks

[0155] In one typical arrangement, the computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0156] The memory can include non-persistent memory and / or volatile memory, such as random access memory (RAM) and / or cache memory, non-volatile memory, such as read-only memory (ROM), EPROM, and / or flash memory, etc. The memory is an example of computer readable media.

[0157] Computer readable media includes permanent and non-permanent, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD), or other optical storage, magnetic cassette, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to a computing device. According to the definition herein, computer readable media does not include transitory media, such as modulated data signals and carrier waves.

[0158] It should also be noted that the terms "comprising", "containing", or any other variant thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article or apparatus that comprises a list of elements does not only include those elements, but can also include other elements not expressly listed or inherent to such process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.

[0159] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0160] 1) The method for determining the state of the PNA described above in the present application first obtains the water storage change amount of the PNA in the target period, and determines the theoretical heat release amount of the PNA in the target period according to the water storage change amount and the molecular sieve structure of the PNA. The PNA has a molecular sieve structure, and the PNA is used to adsorb NOx in the exhaust gas. The initial time of the target period is the initial time of the current driving cycle, and the end time of the target period is the time when the change rate of the theoretical heat release amount of the PNA is less than a first threshold value. Then, the first heat and the second heat are determined, and the actual heat release amount of the PNA in the target period is determined according to at least the first heat and the second heat. The first heat is the heat value of the exhaust gas that has not passed through the PNA in the target period, and the second heat is the heat value of the exhaust gas that has passed through the PNA in the target period. The difference between the second heat and the first heat is less than the actual heat release amount. Finally, the size of the theoretical heat release amount and the actual heat release amount is compared. In the case that the actual heat release amount is less than the theoretical heat release amount, it is determined that the PNA is in a degraded state. In the case that the PNA is in a degraded state, the NOx adsorption amount per unit volume of the PNA is less than a preset adsorption amount. This method makes full use of the water absorption and heat release characteristics of the PNA molecular sieve to diagnose its performance. Diagnosing without NOx can eliminate the problem of inaccurate diagnosis caused by some factors affecting NOx, and does not need active diagnosis. It meets the condition that the PNA can be diagnosed at any time in each driving cycle, and attempts to restore the PNA capacity based on the diagnosis result, solving the problem that the existing technology cannot accurately monitor the adsorption and desorption capacity of the PNA, resulting in a low ability to control NOx emissions.

[0161] 2) The device for determining the state of the PNA described above in the present application, comprising an acquisition unit, a first determination unit and a second determination unit, the acquisition unit is used to acquire the water storage change amount of the PNA in the target period, and determine the theoretical heat release amount of the PNA in the target period according to the water storage change amount and the molecular sieve structure of the PNA, the PNA is a molecular sieve structure, the PNA is used to adsorb NOx in the exhaust gas, the initial time of the target period is the initial time of the current driving cycle, and the end time of the target period is the time when the change rate of the theoretical heat release amount of the PNA is less than a first threshold value; the first determination unit is used to determine a first heat and a second heat, and determine the actual heat release amount of the PNA in the target period according to at least the first heat and the second heat, the first heat is the heat value of the exhaust gas without passing through the PNA in the target period, and the second heat is the heat value of the exhaust gas after passing through the PNA in the target period, and the difference between the second heat and the first heat is less than the actual heat release amount; the second determination unit is used to compare the size of the theoretical heat release amount and the actual heat release amount, and determine that the PNA is in a degraded state in the case that the actual heat release amount is less than the theoretical heat release amount, and the NOx adsorption amount in the unit volume of the PNA is less than a preset adsorption amount in the case that the PNA is in the degraded state. The device fully utilizes the characteristics of the PNA molecular sieve itself to diagnose the performance of the PNA. Diagnosing in the mode without NOx can exclude the problem of inaccurate diagnosis caused by some factors affecting NOx, and does not need active diagnosis, meets the condition that the PNA can be diagnosed at any time in each driving cycle, and attempts to restore the PNA capacity based on the diagnosis result, solves the problem that the adsorption and desorption capacity of the PNA cannot be accurately monitored in the prior art, and leads to a low ability of controlling NOx emission.

[0162] The above only describes the preferred embodiments of the present application and is not used to limit the present application. The present application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method of determining the state of a PNA, characterized by, The method comprises: obtaining a storage average temperature, the storage average temperature being a PNA average temperature stored at the end of a previous driving cycle, the PNA average temperature being an average temperature of the PNA during the previous driving cycle from a time when the vehicle last idled to a time when the vehicle was powered off; determining an initial water storage amount of the PNA according to the storage average temperature and a water storage model of the PNA; obtaining a post-processing temperature of the vehicle; in a case where the initial water storage amount is less than a first preset value and / or the post-processing temperature is less than a second preset value, determining a water storage change amount of the PNA in a target period; obtaining a water storage change amount of the PNA in a target period, and determining a theoretical heat release amount of the PNA in the target period according to the water storage change amount and a molecular sieve structure of the PNA, the PNA being of the molecular sieve structure and being used for adsorbing NOx in exhaust gas, an initial time of the target period being an initial time of a current driving cycle, and an end time of the target period being a time when a change rate of the theoretical heat release amount of the PNA is less than a first threshold value; determining a first heat and a second heat, and determining an actual heat release amount of the PNA in the target period according to at least the first heat and the second heat, the first heat being a heat value of the exhaust gas without passing through the PNA in the target period, and the second heat being a heat value of the exhaust gas after passing through the PNA in the target period, a difference between the second heat and the first heat being less than the actual heat release amount; comparing the theoretical heat release amount and the actual heat release amount, and determining that the PNA is in a degraded state in a case where the actual heat release amount is less than the theoretical heat release amount, and in the case where the PNA is in the degraded state, an adsorption amount of NOx per unit volume of the PNA being less than a preset adsorption amount; the obtaining of the water storage change amount of the PNA in the target period comprises: obtaining a first temperature and a second temperature at each time in the target period, the first temperature being an average value of a temperature of the exhaust gas before passing through the PNA in the target period, and the second temperature being an average value of a temperature of the exhaust gas after passing through the PNA in the target period; obtaining a water storage model of the PNA, the water storage model being used to represent a mapping relationship between a temperature and water stored in the PNA, the water storage model being related to the temperature, time, water content of the molecular sieve before dehydration, and structure of the molecular sieve; determining an average value of the first temperature and the second temperature as a PNA average temperature; determining the water storage change amount of the PNA according to the PNA average temperature, the initial water storage amount, and the water storage model; the first heat being obtained according to an inlet temperature of the PNA, and the second heat being obtained according to an outlet temperature of the PNA, and the actual heat release amount of the PNA in the target period being determined according to at least the first heat and the second heat, comprising: obtaining PNA carrier heat consumption, the PNA carrier heat consumption being heat consumption required when the PNA itself is adsorbed; obtaining heat transfer loss, the heat transfer loss being heat loss generated in the heat transfer process; According to the heat equation Q e = Q PNA后 + Q PNA载体 + Q 传热损失 - Q PNA前 , determine the actual heat release of the PNA in the target period, Q e is the actual heat release of the PNA in the target period, Q PNA后 is the second heat, Q PNA载体 is the PNA carrier heat consumption, Q 传热损失 is the heat transfer loss, Q PNA前 is the first heat.

2. The determination method according to claim 1, characterized in that, determining theoretical heat release of the PNA in the target period according to the water storage change and the molecular sieve structure of the PNA, including: determining a water absorption heat release model according to the molecular sieve structure of the PNA, the water absorption heat release model representing a mapping relationship between water quantity change and heat release; determining the theoretical heat release of the PNA in the target period according to the water storage change and the water absorption heat release model.

3. The determination method according to claim 1, characterized in that, comparing the theoretical heat release and the actual heat release, and determining that the PNA is in a degraded state when the actual heat release is less than the theoretical heat release, including: obtaining environmental conditions, the environmental conditions including at least: an environmental temperature, a degradation coefficient, an intake temperature of an engine, and an intake humidity of the engine, the environmental temperature being a temperature of an environment in which a vehicle is located, the degradation coefficient representing a degradation degree of the PNA at a current time, the degradation coefficient being related to time; determining a correction coefficient according to the environmental conditions, and determining a heat release threshold value as a product of the theoretical heat release and the correction coefficient; comparing the actual heat release and the heat release threshold value, and determining that the PNA is in a non-degraded state when the actual heat release is greater than or equal to the heat release threshold value, and determining that the PNA is in a degraded state when the actual heat release is less than the heat release threshold value.

4. The determination method according to any one of claims 1 to 3, characterized in that, after determining that the PNA is in a degraded state, the method further includes: determining working states of the PNA in a plurality of driving cycles, the working states including a degraded state and a non-degraded state; triggering a regeneration attempt function when the working state of the PNA in two consecutive driving cycles is the degraded state, the regeneration attempt function being a function of attempting to restore the working state of the PNA from the degraded state to the non-degraded state.

5. A device for performing the determination of the PNA state of the method according to any one of claims 1 to 4, characterized in that, including: an obtaining unit, configured to obtain a water storage change of a PNA in a target period, and determine a theoretical heat release of the PNA in the target period according to the water storage change and a molecular sieve structure of the PNA, the PNA being a molecular sieve structure, the PNA being used for adsorbing NOx in exhaust gas, an initial time of the target period being an initial time of a current driving cycle, and an end time of the target period being a time when a change rate of the theoretical heat release of the PNA is less than a first threshold value; a first determining unit, configured to determine a first heat and a second heat, and determine an actual heat release of the PNA in the target period according to at least the first heat and the second heat, the first heat being a heat value of the exhaust gas when the exhaust gas is not passed through the PNA in the target period, and the second heat being a heat value of the exhaust gas after the exhaust gas is passed through the PNA in the target period, a difference between the second heat and the first heat being less than the actual heat release. The second determining unit is configured to compare the theoretical heat release amount with the actual heat release amount, and determine that the PNA is in a degraded state when the actual heat release amount is less than the theoretical heat release amount, and the NOx adsorption amount in a unit volume of the PNA is less than a preset adsorption amount when the PNA is in the degraded state.

6. A computer-readable storage medium, characterized in that, The computer readable storage medium comprises a stored program, wherein the program controls a device in which the computer readable storage medium is located to perform the method for determining the state of the PNA according to any one of claims 1 to 4 when the program is executed.

7. An electronic device, comprising: The computer readable storage medium comprises a stored program, wherein the program controls a device in which the computer readable storage medium is located to perform the method for determining the state of the PNA according to any one of claims 1 to 4 when the program is executed. The computer readable storage medium comprises a stored program, wherein the program controls a device in which the computer readable storage medium is located to perform the method for determining the state of the PNA according to any one of claims 1 to 4 when the program is executed. The computer readable storage medium comprises a stored program, wherein the program controls a device in which the computer readable storage medium is located to perform the method for determining the state of the PNA according to any one of claims 1 to 4 when the program is executed.

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